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AMD Radeon RX 6900 XT Liquid Cooled Edition Now On Sale in Europe

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Woot, seems like I should have pointed out from the review

If you put the RX 6900 XT LC under sustained full load, the temperatures rise to up to 80 ° C (GPU) or 90 ° C (hotspot). The delta between the hottest and middle temperature is relatively small, which speaks for a good heat emission and distribution - despite the high heat density of the 284 watt radiating core. How, among other things, with the help of the HW Infocan be read out, the temperature of the coolant reaches around more than 60 ° C, which is still within, but on the edge of common specifications

>60C water temp? I guess I should be asking for proofs that AIO can reliably work at this temperature instead of giving proofs :roll:
 

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I mean i have my GTX 1080, a 'mere' 180W GPU (Less, since i only watercool the GPU core alone) and a 120mm AIO couldnt keep up, with temps going right back up to air cooling levels and getting 'stuck' as the coolant had issues dropping back in temps, unless load totally ceased
With a 280mm, it doesnt even reach 40C under extended stupid loads like mining or furmark, it simply needed room to spread the heat more than anything else

60C coolant temps would scare the shit out of me, and i probably did reach that with the 120mm


Then again, i had a generic cheapo asetek (corsair H55 i think?) so i genuinely do want to know how this damn thing performs, having seen similar cooling fail in a similar situation
 
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I mean i have my GTX 1080, a 'mere' 180W GPU (Less, since i only watercool the GPU core alone) and a 120mm AIO couldnt keep up, with temps going right back up to air cooling levels and getting 'stuck' as the coolant had issues dropping back in temps, unless load totally ceased
With a 280mm, it doesnt even reach 40C under extended stupid loads like mining or furmark, it simply needed room to spread the heat more than anything else

60C coolant temps would scare the shit out of me, and i probably did reach that with the 120mm


Then again, i had a generic cheapo asetek (corsair H55 i think?) so i genuinely do want to know how this damn thing performs, having seen similar cooling fail in a similar situation

At 60C coolant temp, you would be lucky if the loop (custom or AIO) just fail by itself and doesn't take anything else along with it since plastics can deform and the loop start leaking. PETG hardtube already starts to deform at 45C coolant temp.

Just wait 2 years and you will have a few "anecdotal evidences" about how this thing fail :D
 

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At 60C coolant temp, you would be lucky if the loop (custom or AIO) just fail by itself and doesn't take anything else along with it since plastics can deform and the loop start leaking. PETG hardtube already starts to deform at 45C coolant temp.

Just wait 2 years and you will have a few "anecdotal evidences" about how this thing fail :D
well the 1080 has been on the 280mm for... a year? maybe more, and problem free. I doubt a smaller, overheating cooler would have lasted that long.
 
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I mean i have my GTX 1080, a 'mere' 180W GPU (Less, since i only watercool the GPU core alone) and a 120mm AIO couldnt keep up, with temps going right back up to air cooling levels and getting 'stuck' as the coolant had issues dropping back in temps, unless load totally ceased
With a 280mm, it doesnt even reach 40C under extended stupid loads like mining or furmark, it simply needed room to spread the heat more than anything else

60C coolant temps would scare the shit out of me, and i probably did reach that with the 120mm


Then again, i had a generic cheapo asetek (corsair H55 i think?) so i genuinely do want to know how this damn thing performs, having seen similar cooling fail in a similar situation
Well, the 295x2 managed fine with 400W+ loads on a 120mm and didnt run anywhere near air cooled temps. Same with the water cooled fury x and vega 64. Something tells me there was something wrong with your setup.
 
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Well, the 295x2 managed fine with 400W+ loads on a 120mm and didnt run anywhere near air cooled temps. Same with the water cooled fury x and vega 64. Something tells me there was something wrong with your setup.

1. 295x2 have separate heatsink+fan assembly for VRAM and VRM cooling
cooler3_small.jpg


2. From TPU review, each GPU on the 295x2 barely pull 130W under full load, x2 and you have 260W going into the AIO loop
 
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1. 295x2 have separate heatsink+fan assembly for VRAM and VRM cooling
View attachment 226855

2. From TPU review, each GPU on the 295x2 barely pull 130W under full load, x2 and you have 260W going into the AIO loop
1. Per that same review, total board power during average workloads in 430w. That means the memory, VRM, fan, and pump are pulling 170w total. That means that non GPU components are pulling 40% of total board power.

The total board power of a 1080 is roughly 186w per TPU. Assuming the same percentage applies, at 40%, that would leave approx. 111 watts being drawn by the 1080 GPU itself.

So if a 120mm AIO heatsink can manage keeping two 130w GPU dies at 60c (which is well below the average temp of an air cooled GPU), it should be able to handle a single 111 watt GPU die without issue. Even if the board components on the 1080 were massively more efficient (which I doubt given the VRAM speed) and the 1080 die itself drew 140ish watts, that would still be only roughly half the draw of the 295x2.

2. Mussles stated he was using something like a corsair h55. That is a AIO meant for a CPU, point being it too is only cooling the GPU die, the VRM, memory, ece would still need to be air cooled, and are not influencing the temp of the GPU here.
corsair_cw_9060010_ww_hydro_series_h55_quiet_1094198.jpg

Frankly there should be no issue cooling a single pascal GPU die with a 120mm AIO rad. My guess would be bad mounting pressure or incomplete die coverage if he was still seeing air cooled temps.
 
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1. Per that same review, total board power during average workloads in 430w. That means the memory, VRM, fan, and pump are pulling 170w total. That means that non GPU components are pulling 40% of total board power.

The total board power of a 1080 is roughly 186w per TPU. Assuming the same percentage applies, at 40%, that would leave approx. 111 watts being drawn by the 1080 GPU itself.

So if a 120mm AIO heatsink can manage keeping two 130w GPU dies at 60c (which is well below the average temp of an air cooled GPU), it should be able to handle a single 111 watt GPU die without issue. Even if the board components on the 1080 were massively more efficient (which I doubt given the VRAM speed) and the 1080 die itself drew 140ish watts, that would still be only roughly half the draw of the 295x2.

2. Mussles stated he was using something like a corsair h55. That is a AIO meant for a CPU, point being it too is only cooling the GPU die, the VRM, memory, ece would still need to be air cooled, and are not influencing the temp of the GPU here.
View attachment 226856

Frankly there should be no issue cooling a single pascal GPU die with a 120mm AIO rad. My guess would be bad mounting pressure or incomplete die coverage if he was still seeing air cooled temps.

The answer lies quarely on ambient temp, if you have high ambient temp --> high coolant temp.

Radiator space, water flow and fans speed/ static pressure decide the delta temp between Ambient/Coolant. Basically a cheap 120mm AIO will have high delta temp, combined with high Ambient, high coolant temp is guaranteed.

Let say the Delta temp is 10C for 140W heatload, if the temperature inside the case is 40C because of poor airflow and you set the fan as exhaust instead of intake, you are looking at 50C coolant temp. Doubling the heat load would of course doubling the Delta Temp (almost).
 
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Mussels

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1. 295x2 have separate heatsink+fan assembly for VRAM and VRM cooling
View attachment 226855

2. From TPU review, each GPU on the 295x2 barely pull 130W under full load, x2 and you have 260W going into the AIO loop
My god look at that thing, dual AIO pumps and a fan

That's the kind of stupid overkill i love to see working cause it means one day i could be an idiot and daisy chain some asetek AIO's like that myself!
 
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I mean i have my GTX 1080, a 'mere' 180W GPU (Less, since i only watercool the GPU core alone) and a 120mm AIO couldnt keep up, with temps going right back up to air cooling levels and getting 'stuck' as the coolant had issues dropping back in temps, unless load totally ceased
With a 280mm, it doesnt even reach 40C under extended stupid loads like mining or furmark, it simply needed room to spread the heat more than anything else
There was something catastrophically wrong with the pump or contact to the die. I have a 1080 too with a 120mm AIO and it barely breaks 47-48C, even overclocked.

Also, I forgot numerously times to start the fan and even the pump with the GPU reaching 90C and God knows what the coolant temperature was and nothing bad ever happened. That's not supposed to prove anything but whenever manufacturers claim that something is spec'd up to XYZ Celsius what they really mean is that's what they were tested up to, not that failure is inevitable if you pass that threshold.
 
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The answer lies quarely on ambient temp, if you have high ambient temp --> high coolant temp.

Radiator space, water flow and fans speed/ static pressure decide the delta temp between Ambient/Coolant. Basically a cheap 120mm AIO will have high delta temp, combined with high Ambient, high coolant temp is guaranteed.

Let say the Delta temp is 10C for 140W heatload, if the temperature inside the case is 40C because of poor airflow and you set the fan as exhaust instead of intake, you are looking at 50C coolant temp. Doubling the heat load would of course doubling the Delta Temp (almost).
True, although if you have ambient temps that high air cooling will also suffer tremendously, and it should be solvable with the addition of either a new intake fan or additional exhaust fans (preferably around the AIO radiator). I feel like if the ambient temp was solely to blame for such poor performance, then no AIO would perform well in modern cases, 40c ambient isnt hard to hit with high end builds with no side fans, and they do not struggle with AIO temps. You definely should not be seeing air cooled temps in such a situation.

I still stand by my guess of poor mounting pressure or bad pump. Perhaps low fluid? In my experience with AIOS if you are hitting 80c+ temp on a chip you are seeing a serious mechanical or fluid malfunction, especially on a big bare die like a GPU.
 

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There was something catastrophically wrong with the pump or contact to the die. I have a 1080 too with a 120mm AIO and it barely breaks 47-48C, even overclocked.

Also, I forgot numerously times to start the fan and even the pump with the GPU reaching 90C and God knows what the coolant temperature was and nothing bad ever happened. That's not supposed to prove anything but whenever manufacturers claim that something is spec'd up to XYZ Celsius what they really mean is that's what they were tested up to, not that failure is inevitable if you pass that threshold.
H55 was the lowest of the low end 120mm AIOs

Its not like it ever ran at 90C, but the temps would go 60's and up, even with dual fan
240mm with a single slow fan had no issue, 280mm laughs at it (technically it has no fans, as its got partial airflow from 200mm case fans kinda guided into it)

I just like hybrid GPU's dangit
 
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Have you seen 295x2? This card should have no problems with this rad
I made a custom water cooling solution using 120 MM AIO for my RTX 3070, it was not good enough (Would get as high as 80C if i played for more than 3 hours), i had to shift to 240 MM to get temps down to 59 C and i am talking about RTX 3070, RX 6900XT would need a lot more cooling.
 

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I made a custom water cooling solution using 120 MM AIO for my RTX 3070, it was not good enough (Would get as high as 80C if i played for more than 3 hours), i had to shift to 240 MM to get temps down to 59 C and i am talking about RTX 3070, RX 6900XT would need a lot more cooling.
Yes, thank you! someone else with the same situation... if the load was low enough it'd be fine, but given enough time thats what i ran into

Gah. This stuff is reigniting my interest in watercooling heaps, i'm so glad i finally have a complete custom loop already
 
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Yes, thank you! someone else with the same situation... if the load was low enough it'd be fine, but given enough time thats what i ran into

Gah. This stuff is reigniting my interest in watercooling heaps, i'm so glad i finally have a complete custom loop already

get yourself a Temp sensor fitting, you can control the fans+pump speed via coolant temperature this way, much better than CPU/GPU temp control because coolant heat up/cool down slowly.

fitting.jpg
 

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Seems someone's bitter for not affording a GPU at this price.

You're wrong with your conclusion. Why should anyone overpay almost twice the price from suggested price from Nvidia and AMD?
 

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get yourself a Temp sensor fitting, you can control the fans+pump speed via coolant temperature this way, much better than CPU/GPU temp control because coolant heat up/cool down slowly.

View attachment 226995
It was with a too small AIO, if you follow the story back
 
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It was with a too small AIO, if you follow the story back

Nah I mean for your current loop, just something to play around with and gain some knowledges :D
 

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Nah I mean for your current loop, just something to play around with and gain some knowledges :D
Oh, yes i do want one for that. Thing is i actually like static fan speeds, if the noise is constant i can tune it out - but variations get my attention
 
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Oh, yes i do want one for that. Thing is i actually like static fan speeds, if the noise is constant i can tune it out - but variations get my attention

That's the thing, water has high specific heat capacity that it's slow to heat up/cool down.
It takes 30s for my loop to heat up by 1C during game and longer when the fans reach higher RPM

This is 10mins of gaming
fan speed.jpg


Quite hard to notice fans speed variation this way.
 
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Our system are almost identical except the fans: 8700K + 2080Ti (~350W combine load), both run S1 pump at max speed without heatsink. Even now after I swapped to a 9900K + 3090 for a full year, my S1 pump is still running fine.

Same case (Lian Li O11D), same pumps running max speed all the time without heatsink and no airflow over the pumps (no air access to the back), the only difference is that I run my fans at 2000rpm vs 1200rpm on my friend's built leading to much lower liquid temp on my case.
That does make it sound like fluid temperature is the main variable, yes. Still can't eliminate other factors with a sample size of one (everything from chance to QC to production variance to ambient temperatures), but at least it points towards higher fluid temperature affecting things. Any stronger statement than that requires a larger sample size.
Though you are just gonna disregard any evidence as anecdotal evidence aren't you?
What on earth makes you say that? Seriously, please stop taking this personally. This is just ridiculous.
Surely you are not running anything in your systems at temperature that you deem could cause potential failure? Like running your 6900XT at 180W undervolted instead of 300W+ that it could run without issue?
Please stop talking about things you clearly don't know anything about. Going off of assumptions like that just risk making you look dumb - like in this case.

To clarify: for now, I'm gaming on a 1440p60 monitor. That means the 6900XT is massively overpowered for the vast majority of games. I also have a small case and a small water loop. So, rather than push things unnecessarily (and, among other things, dump a lot of unnecessary heat into the room, which is uncomfortable) I have tuned things to a level where I have a minor (and unnoticeable in >99% of games at my resolution and refresh rate) loss of performance in exchange for a near halving of power draw. This saves me (a tiny amount) of money, makes for a more comfortable play experience due to less heat in the room, and gives me the satisfaction of knowing my PC is running extremely efficiently. If needed, I can absolutely run this at full power - I've stress tested the system in >30° ambient temperatures this summer at full power, and fluid temps never exceeded 45°C under full load, with the GPU drawing ~330W and the CPU 140W. So my setup is perfectly capable of handling the full power draw of all of its components - I just don't really need that, and have a better experience when tuning things down a bit.
I guess you don't know that plastic is not a thermal insulator, the pump IC temperature is not decoupled from the liquid temperature. The specs for DDC pump also have maximum liquid temperature of 60C (I thought it was 50C earlier)
It isn't an insulator, but it is a rather terrible conductor of heat. Most plastics are in the .1-.3 W/mK range, with some glass fiber reinforced plastics hitting .4. Steel, which is a relatively poor conductor of heat for a metal, is around 50 - more than 100 times higher. I never said that DDC-style pumps aren't affected by fluid temperature at all, but the low thermal conductivity of plastics means that decoupled is an accurate term - they are separated by a barrier with sufficiently low conductivity for there to only be a minor impact. There's a reason why you find dozens of options for DDC heatsinks out there with far, far fewer for D5 pumps - the D5 pumps are designed to be cooled by the passing fluid, while the DDCs are not. Being decoupled doesn't mean that it isn't affected by liquid temperatures at all, but it does mean that there is far, far less impact from this on the pump overall.
So yeah, couple with the fact that higher water temp will lead to faster rate of water permeation, it's not unfounded that cooling 350W with a single 120mm AIO will lead to EARLY pump failure. Well the AIO might live long, if you live in Alaska that is.

Not sure how legit this is but it seems the general consensus for max water temp for AIO is also 60C
View attachment 226784
As a spec from an AIO maker, that would indicate that such conditions are covered under their warranty though. Given that Corsair has 5-year warranties for their AIOs, that does say something about this threshold - mainly that it doesn't equal imminent death for pumps in the loop. I'm obviously not saying you should expect your AIO to last 5 years running 24/7 at 60°, but if that temperature was cause for imminent concern they would lower the spec - just look at how this is practiced for PSU operating temperature ratings.
Both the 980ti and 1080ti were 250 watt cards under extreme loads and the others much less. Maybe instead of constantly clogging up this thread demanding proof, you provide some of your own because that's how High School Debates work.
Uh, I'm not making any new claims here. New claims require new evidence, as new claims aim to change the status quo. And the status quo is that 120mm AIOs have been used on 250W+ GPUs for more than half a decade without significant issue. Also, what kind of proof would it even be possible to produce to show that these AIOs are not failing? A negative statement like that isn't provable without astronomical effort. Are you suggesting I survey everyone who purchased a card like this? The general tendency for people to talk about and focus on negative experiences means it's more likely to find evidence of failure than continued operation (and it's also more searchable thanks to easily identified terms such as "failure", "dead", etc.)

As for the wattage, 250W at stock for a highly OC'able GPU like the 980ti or 1080ti makes it pretty comparable to this overall, at least on paper. Higher end 1080tis typically had ~330W power limits. I would definitely expect an AIO-cooled one to operate in that range.
Woot, seems like I should have pointed out from the review

>60C water temp? I guess I should be asking for proofs that AIO can reliably work at this temperature instead of giving proofs :roll:
Wow, that's definitely higher than I would have expected. I completely agree that that is not an acceptable fluid temperature.

Though, looking at that screenshot, the fan is also running at 1300rpm? Either there is something very wrong with the fan profile on the 6900XT LC, or they had some sort of bug going on there. I would expect this to come with a fan capable of running at at least 3000rpm and for the fan curve to go up to at least 2000 under normal operation.

For reference, the Fury X came with a high-speed Gentle Typhoon (a variant of the 4250rpm version, I think?), and while it never ran at anywhere near 100% speed, it could ramp up relatively high (>2000rpm) if needed.

So, while this does indeed point towards a sub-par cooling system, that (for now) seems to be down to far, far too low fan speeds rather than the overall dimensions of the cooler. I would be extremely interested to see them re-run these tests at a higher fan speed. Of course, if a condition of the statement "A 120mm AIO is insufficient to cool a 300+W GPU and will lead to early pump death" is that the fan won't ever run above 1300rpm, then, well, yes, I would agree with that statement. But I see no reason why that would be a condition, as there are after all plenty of fans capable of running far faster than that - quietly, even.
 
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Mussels

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Wow, the damn thing uses 350-400W? It's up there with a 3090 in that regard


1638357037629.png



Yeah. I had doubts, results matched what i feared. That cooler isn't enough.
 
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Wow, the damn thing uses 350-400W? It's up there with a 3090 in that regard


View attachment 227203


Yeah. I had doubts, results matched what i feared. That cooler isn't enough.
Yeah, it seems like it's way too focused on being quiet. You're not cooling 350-ish watts quietly with a 120mm radiator, no matter what. Either they cheaped out on the fan for some reason, or they're just making the wrong priorities here. 1300rpm for this is ridiculous. The review seems to say it peaks at 1700rpm and 53% PWM, which indicates that this is a ~3000rpm fan. At least add a selectable "performance" fan profile that bumps it to 2000rpm for regular operation? That should be a drastic change. Though this seems to be begging for a NF-A12x25/P12/T-30 fan swap, tbh.
 
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Uh, I'm not making any new claims here. New claims require new evidence, as new claims aim to change the status quo. And the status quo is that 120mm AIOs have been used on 250W+ GPUs for more than half a decade without significant issue. Also, what kind of proof would it even be possible to produce to show that these AIOs are not failing? A negative statement like that isn't provable without astronomical effort. Are you suggesting I survey everyone who purchased a card like this? The general tendency for people to talk about and focus on negative experiences means it's more likely to find evidence of failure than continued operation (and it's also more searchable thanks to easily identified terms such as "failure", "dead", etc.)

As for the wattage, 250W at stock for a highly OC'able GPU like the 980ti or 1080ti makes it pretty comparable to this overall, at least on paper. Higher end 1080tis typically had ~330W power limits. I would definitely expect an AIO-cooled one to operate in that range.

667f0bd8cc1b5671ad4f8bbe722f4deb_XL.jpg
24956_vga_evga_geforce_gtx_1080ti_sc2_hybrid_gaming_11gb_icx__11g_p4_6598__2.jpg


Do you see there is that fan on the GPU shroud? they are to cool the VRAM and VRM. Those AIO only cool the GPU, that means only ~200W is dumped into the loop (with 250W TGP)
Whereas the full 350W is dumped into the loop with the 6900XT LC, just like FuryX.

As a spec from an AIO maker, that would indicate that such conditions are covered under their warranty though. Given that Corsair has 5-year warranties for their AIOs, that does say something about this threshold - mainly that it doesn't equal imminent death for pumps in the loop. I'm obviously not saying you should expect your AIO to last 5 years running 24/7 at 60°, but if that temperature was cause for imminent concern they would lower the spec - just look at how this is practiced for PSU operating temperature ratings.

At 60C and above liquid temp, these Asetek AIO are gonna fail rather quick (these 6900XT LC use Asetek AIO), as mentioned by Asetek engineer (at 6:50)

Please stop talking about things you clearly don't know anything about. Going off of assumptions like that just risk making you look dumb - like in this case.

Seems like I know more about watercooling than you do
 
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