Cooling 2 Vega 64s with 1 pump and 2 radiators Question

[kapone32]

Good morning, I have 2 Vega 64 cards with water blocks on them. One is the Byisiki water block cooled on a Sapphire Vega 64 Nitro+ and the other is an Alphacool EIswolf cooled XFX Vega 64. The Alphacool unit is hooked up to a 420MM radiator. The other card is in a Alphacool Eisbear loop also with a 420MM rad. I am noticing that my CPU temps (AMD 1900X) go into the 70s while under load. I got a Noctua cooler that I will be using to cool the CPU going forward. My question is do you guys/gals think that the pump on the Eiswolf will be strong enough to provide the necessary pressure to run the fluid through 2 420MM radiators to cool both cards effectively?

 

[EarthDog]

That may be pushing it. Can you find any specs on the pump they are using? Considering asking them as well.

 

[FireFox]

If it is a D5/VPP655 it should do the job

 

[DR4G00N]

Why not just combine everything into one loop? Then you'll have two pumps in the system helping each other which should be able to circulate the coolant reasonably well.

 

[thebluebumblebee]

That system is screaming for a custom loop. Seriously, get rid of the Eiswolf and Eisbear, get a CPU block specifically designed for TR4, a GPU block for the XFX Vega 64 and a pump/res and be done with it.

 

[kapone32]

That may be pushing it. Can you find any specs on the pump they are using? Considering asking them as well.

I have looked all over the internet but I am at work as well so I can't get onto a lot of websites but even the Palhacool site does not tell me the speed of the pump.

 

[TheoneandonlyMrK]

Good morning, I have 2 Vega 64 cards with water blocks on them. One is the Byisiki water block cooled on a Sapphire Vega 64 Nitro+ and the other is an Alphacool EIswolf cooled XFX Vega 64. The Alphacool unit is hooked up to a 420MM radiator. The other card is in a Alphacool Eisbear loop also with a 420MM rad. I am noticing that my CPU temps (AMD 1900X) go into the 70s while under load. I got a Noctua cooler that I will be using to cool the CPU going forward. My question is do you guys/gals think that the pump on the Eiswolf will be strong enough to provide the necessary pressure to run the fluid through 2 420MM radiators to cool both cards effectively?

It is probably going to be a stretch tbh I have experienced one pump two cards and rads , poor head pressure made filling a pain ,it could be made to work but the flow rate wouldn't be great.

 

[newtekie1]

My question is do you guys/gals think that the pump on the Eiswolf will be strong enough to provide the necessary pressure to run the fluid through 2 420MM radiators to cool both cards effectively?

Nope.

 

[DeathtoGnomes]

I have looked all over the internet but I am at work as well so I can't get onto a lot of websites but even the Palhacool site does not tell me the speed of the pump.

post the brand, any number on it, and other specs you can give, maybe someone can find that info.

 

[ypsylon]

Just out of curiosity. Are Vegas overclocked? These things heat-up like furnace. Even at stock its atrocious.

Without any specifics it's hard to offer any sensible diagnosis. Post a photo.

What 420 rads?

If it was my decision I would make one custom loop with one or two D5s in series.

Pumps in both AIOs for sure are some low rpm variants of DC/DDC (a la Asetek). D5 requires a lot of space and from photo I don't see any characteristics of D5, never seen AiO with D5 anyway. Also layout is important with AIO, I used for a while LiqMax2 240 from Enermax. It was great as long as hoses were placed right, which on a bench was not always achievable.

Don't even think about Eiswolf/Eisbear pump powering 2 420 rads.

 

[newtekie1]

post the brand, any number on it, and other specs you can give, maybe someone can find that info.

The pump on the Eiswolf is one of those pump/block Asetek deals. They are barely powerful enough to push the fluid through one block and rad.

 

[EarthDog]

The pump on the Eiswolf is one of those pump/block Asetek deals. They are barely powerful enough to push the fluid through one block and rad.

Assuming this is true, that is correct.

 

[DeathtoGnomes]

back the bus up here. are you sure its 420mm radiators? not 240?
The Eiswolf pump is too weak for a 420 rad, expect premature failure with a larger rad and would not surprised to see higher temps on that. Even if its a 240 rad, life expectancy is shorter. The Eisbear might be a different story, if its not the same pump.

 

[thebluebumblebee]

I believe, but can't prove, that the same pump (or at least very similar) is used for the Eiswolf, Eisbear and the FD Kelvin. If JayzTwoCents couldn't get the Kelvin pump to work with one GPU block and 2 x 240 mm rads....

https://www.youtube.com/watch?v=wUtcXD2zgko

 

[John Naylor]

GPU water blocks are huge and despite their wattage being 2 -3 times that of the CPU, that allows them always run cooler in a mixed loop. The best way to approach this is to split the flow and run the GPU water blocks in parallel, with each seeing half the flow that the CPU sees. I'm running a 35X2 dual pump which feeds a 280mm rad, then splits into 2 paths, thru the GPUS, then the split recombines into a single flow path to the 420 rad, MoBo Block, CPU, reservoir and back to pump. Under stress testing the CPU hits the mid 70s with fans at 1200 rpm ... GPU temps are 39C. Letting the fans operate between 325 and 850 rpm, (they shut off at idle) and peak loads, they CPU sees hi 50s to mid 60s and the GPUs are at 42C.

I have not seen the Alphacool AIO pumps tested but I don't expect themto do any better than the Corsair units which I have seen tested and the ones with 240/280 rads are pushing out just 0.11 gpm.

I don't have the dualie 35x2 to push the fluid thru the loop, it's basically if one pump fails, the other still there. But at 50% PWM, Im pushing about 1.5 gpm. See 50% and 100% graphs here:
https://martinsliquidlab.wordpress.com/2012/01/29/swiftech-mcp35x2-pump/6/

Things to consider:

1. I have never seen an AIO w/ flows even approaching 0.25 gpm .... this really is inadequate. I would go with a Swiftech variable speed MCP655 or if ya wanna go all out geek a 35X2 w/ stand and heat sink
https://martinsliquidlab.wordpress.com/2012/12/25/swiftech-mcp-655-pwm-drive-pump-review/7/
http://www.frozencpu.com/products/1...Pump_w_G14_Thread_Ports_Perfectly_Tapped.html

http://www.frozencpu.com/products/1...C_Industrial_PWM_Pump_-_Black_MCP35X2-BK.html
http://www.frozencpu.com/products/1...ch_MCP35x2_Dual_Pump_Heatsink_MCP35X2-HS.html

2. Split the loop and run the GFX card in parallel .. reduces backpressure to 27% of serial routing. See pic above.

3. Let's do the math and see if we can salvage the rads

CPU say 225 watts OCd
Vega 64 say 350 watts OC'd
I assume no MoBo or other water blocks.

Start here...

https://www.overclock.net/forum/61-water-cooling/1457426-radiator-size-estimator.html

You have 925 watts of "theoretical load" ... for dual GFX cards, we can assume that 40% of that is not loading the rads because not everything is at peak and much is being radiated off blocks, tubing, rad shrouds and other surfaces ... so you have 925 x 60% for the rads to deal with or 5r5 watts.

Your rads are very thin but unlike most AIOs, at least they are copper. Im not sure of the thickness but they look to be almost the same thickness as the fans or say 30mm .. unfortunately no test data for that thickness in the charts to we'll uses 45mm.

If ya download the alphacool data spreadsheet from above link, a 45 x 420 radiator from alphacool is good for about 245 watts at 1250rpm. Two rads would get you 490. With fans in push / pull, that would be 296 x 2 or 592 watts.

with 1800 rpm fans, you'd get 686 watts of cooling.... with 2200 rm fans, 990 watts of cooling in push / pull.

To stop fans from spinning up and spinning down making whiring sounds as loads change Id suggest:

a. Increase the thermal mass with a large reservoir
b. Use a decent MoBo with fan control utility that allows you to ramp down rpm over 90 seconds

3. Grab a 2nd Byisiki water block and as big a res as you can fit in the system

 

[EarthDog]

GPU water blocks are huge and despite their wattage being 2 -3 times that of the CPU, that allows them always run cooler in a mixed loop.

So, because of the size of the block.... not the radiator and airflow is why these run a lot cooler than the CPU, eh? Block size has almost nothing to do with that. Its big because it has to cover more. You would get the same temps with a GPU core only block that is much smaller than a full cover using the same loop and parameters.

a. Increase the thermal mass with a large reservoir

a larger res does not stop spikes. More water just means the system takes longer to equalize... but it doesn't stop spikes. Modern motherboards or fan software have hysterisis settings... that or don't set at a point where it teeters in the first place.

 

[kapone32]

back the bus up here. are you sure its 420mm radiators? not 240?
The Eiswolf pump is too weak for a 420 rad, expect premature failure with a larger rad and would not surprised to see higher temps on that. Even if its a 240 rad, life expectancy is shorter. The Eisbear might be a different story, if its not the same pump.

Yes they are both 420 mm rads. According to Corsair Link the Esiwolf (3200 RPM) runs about 700 RPM faster than the EIsbaer (2500 RPM). I do not think they are using the same pump. I have had the Alphacool Eisbaer running with a Vega 64 since 2018 so I do not anticipate any issues but time will tell.

GPU water blocks are huge and despite their wattage being 2 -3 times that of the CPU, that allows them always run cooler in a mixed loop. The best way to approach this is to split the flow and run the GPU water blocks in parallel, with each seeing half the flow that the CPU sees. I'm running a 35X2 dual pump which feeds a 280mm rad, then splits into 2 paths, thru the GPUS, then the split recombines into a single flow path to the 420 rad, MoBo Block, CPU, reservoir and back to pump. Under stress testing the CPU hits the mid 70s with fans at 1200 rpm ... GPU temps are 39C. Letting the fans operate between 325 and 850 rpm, (they shut off at idle) and peak loads, they CPU sees hi 50s to mid 60s and the GPUs are at 42C.

View attachment 118534

I have not seen the Alphacool AIO pumps tested but I don't expect themto do any better than the Corsair units which I have seen tested and the ones with 240/280 rads are pushing out just 0.11 gpm.

I don't have the dualie 35x2 to push the fluid thru the loop, it's basically if one pump fails, the other still there. But at 50% PWM, Im pushing about 1.5 gpm. See 50% and 100% graphs here:
https://martinsliquidlab.wordpress.com/2012/01/29/swiftech-mcp35x2-pump/6/

Things to consider:

1. I have never seen an AIO w/ flows even approaching 0.25 gpm .... this really is inadequate. I would go with a Swiftech variable speed MCP655 or if ya wanna go all out geek a 35X2 w/ stand and heat sink
https://martinsliquidlab.wordpress.com/2012/12/25/swiftech-mcp-655-pwm-drive-pump-review/7/
http://www.frozencpu.com/products/1...Pump_w_G14_Thread_Ports_Perfectly_Tapped.html

http://www.frozencpu.com/products/1...C_Industrial_PWM_Pump_-_Black_MCP35X2-BK.html
http://www.frozencpu.com/products/1...ch_MCP35x2_Dual_Pump_Heatsink_MCP35X2-HS.html

2. Split the loop and run the GFX card in parallel .. reduces backpressure to 27% of serial routing. See pic above.

3. Let's do the math and see if we can salvage the rads

CPU say 225 watts OCd
Vega 64 say 350 watts OC'd
I assume no MoBo or other water blocks.

Start here...

https://www.overclock.net/forum/61-water-cooling/1457426-radiator-size-estimator.html

You have 925 watts of "theoretical load" ... for dual GFX cards, we can assume that 40% of that is not loading the rads because not everything is at peak and much is being radiated off blocks, tubing, rad shrouds and other surfaces ... so you have 925 x 60% for the rads to deal with or 5r5 watts.

Your rads are very thin but unlike most AIOs, at least they are copper. Im not sure of the thickness but they look to be almost the same thickness as the fans or say 30mm .. unfortunately no test data for that thickness in the charts to we'll uses 45mm.

If ya download the alphacool data spreadsheet from above link, a 45 x 420 radiator from alphacool is good for about 245 watts at 1250rpm. Two rads would get you 490. With fans in push / pull, that would be 296 x 2 or 592 watts.

with 1800 rpm fans, you'd get 686 watts of cooling.... with 2200 rm fans, 990 watts of cooling in push / pull.

To stop fans from spinning up and spinning down making whiring sounds as loads change Id suggest:

a. Increase the thermal mass with a large reservoir
b. Use a decent MoBo with fan control utility that allows you to ramp down rpm over 90 seconds

3. Grab a 2nd Byisiki water block and as big a res as you can fit in the system

THanks for the input. According to Alphacool the Eisbaer is rated at 70 l hour or 1.16L per minute The rads are 30MM copper. There is no point in OC of Vega 64 or TR4. I do not see anywhere north of 250 Watts on my GPUs according to Rivatuner. The only thing I did to the CPU is set it at 4 GHZ on 1.325 volts so I don't expect a huge power draw there either. The only temp I am concerned about is the CPU and I do believe that it is due to the block not covering the entire IHS on TR4 more so than the loop. My 2 420s have Noctua 140MM x6 on one and Acrtic Cooling F14s x3 with 3 Deepcool CF140s on the other they are all set to run on PWM none of them spins up higher than 1000 RPMs. Even Corsair link shows a maximum draw of no higher than 800 watts on my 1200 Watt PSU while running a crossfire enabled game (TWWH2) at 4K.

Just out of curiosity. Are Vegas overclocked? These things heat-up like furnace. Even at stock its atrocious.

Without any specifics it's hard to offer any sensible diagnosis. Post a photo.

What 420 rads?

If it was my decision I would make one custom loop with one or two D5s in series.

Pumps in both AIOs for sure are some low rpm variants of DC/DDC (a la Asetek). D5 requires a lot of space and from photo I don't see any characteristics of D5, never seen AiO with D5 anyway. Also layout is important with AIO, I used for a while LiqMax2 240 from Enermax. It was great as long as hoses were placed right, which on a bench was not always achievable.

Don't even think about Eiswolf/Eisbear pump powering 2 420 rads.

 

[Gasaraki]

ROFL. A 480 rad to cool a single video card? A 480 rad can cool 3 video cards and a cpu at the same time.

 

[kapone32]

Thanks everyone for contributing your input and thoughts. I really appreciate it. I have settled with using the Noctua cooler for the CPU. I am still going to leave the pumps but I am going to connect both GPUs to both pumps leaving the D5 covered with a plastic block in the middle of the case. That way I can monitor the levels and add or remove fluid as needs vary. I wish I did more than gaming and video editing when I am at home but I will make sure I post pics of my build.

 

[Deleted member 178884]

480

420*
And in case you didn't notice he's using a HEDT cpu (1900x) and 2 vega 64's (even undervolted they pull 220w~+) each. so yeah.

 

[thebluebumblebee]

leaving the D5

D5?????

 

[kapone32]

D5?????

The pump unit that is with a CPU block.

 

[DR4G00N]

The pump unit that is with a CPU block.

That uses a DC-LT pump 2600 rpm model IIRC.

 

[thebluebumblebee]

The pump unit that is with a CPU block.

Are you switching to air cooling for your CPU because you were disappointed with what you thought was a D5 based water cooling system?

 

[kapone32]

Nope I was overjoyed with the D5 system. The only reason I am going to air cooling is that the block on the pump does not cover the entire IHS on TR4