Amd 6800 XT - PSU enough?

[Cvrk]

I have the Seasonic Prime 650-TX 80 Plus Titanium.
I want to upgrade the gpu to Amd 6800 XT.
Looking at the review for this card here on TPU i see it needs a minimum of 650w psu,.... Which i have.

If i go to Seasonic calculator page it tells me i need a 850w psu.
My specs are on the left( next to my profile).


What do you think will happen worst case scenario? The card will underperform, in which case its wasted money, or even worse, sudden loss of power like PC restarts when gaming?

 

[Beginner Micro Device]

Don't worry, your PSU will be fine. Worst case scenario you will be forced to downclock your 6800 XT by 100 MHz which will result in a negligible performance loss (up to 3 percent). I'm telling your from my experience of running two GTX 1070s using a similar PSU for 4 years straight.

 

[tabascosauz]

@Cvrk I don't think the issue is that 650W won't run a 6800XT's TDP, more that some of the Navi21 cards have had serious transient spike issues that can cause problems with PSUs that otherwise should provide more than enough power. iirc that mostly resulted in restarts or crashes.

It's hard to say with certainty. Back then TPU didn't test for transients before at least 6950XT, and later graphs suggest that 6900XT was by far the worst, and 6800XT was mostly in line with other RDNA and Ampere cards. Bigger 30 series cards were also big time offenders but the graphs speak for themselves concerning the 6900XT.

I haven't seen any exhaustive testing of this or deep dives as to the cause, but later released cards like 6950XT and Navi31 seem to put the issue behind them.

 

[gurusmi]

You can calculate the needed Power on your own.

 

[P4-630]

You can calculate the needed Power on your own.

If i go to Seasonic calculator page it tells me i need a 850w psu.

It seems Seasonic has a calculater as well.

Wattage Calculator

How much wattage do I need my power supply to have for my new PC build? This tool will help you select a suitable power supply unit for your system.

seasonic.com

Nothing wrong with the be quiet calculator though, I use it myself as well.

 

[freeagent]

My system will shut down my Prime GX-750 so hard that I have to trip the switch.

Edit:

Good thing I was forced to buy a cheap PSU when I bought my GPU..

 

[Beginner Micro Device]

serious transient spike issues that can cause problems

No more than 4 hundred watts if we speak about 6800 XT. And even the slightest underclock by 100ish MHz pulls it down by 50s of watts.

 

[Cvrk]

@tabascosauz the simptons you referring sound copy pasted from my RX 480 back 8 years ago.
Looking at reviews the amd 7900xtx ( the latest from amd) has huge power issues and driver problem on Windows 11. Not the same cam be said about the XT version which looks very stable.

Right now the 6800 XT is heavely discounted on the second hand market. Looking at 380 EUR. And the performance vs price is superb. The prices are not going up, it's going to be even cheaper or same.


Really feel like i wanna push a bit more my system, since last year i added a new cpuc.

Maybe should wait on fall, for the 7800 XT?? Afraid it might ask for a bigger PSU. Not to mention newer cards need better motherboards.
You lose 3% from PSU. 10% from mobo and it feels like wasted money.

 

[Beginner Micro Device]

should wait

Seems reasonable but not because of the reasons you stated (especially the 10% drop from the mobo which has nothing to do with reality: cards like 6800 XT lose no more than 1 percent if run at PCI-E 3.0 mode) and because the difference between your 5700 XT and 6800 XT is nothing to be impressed by. I'd rather go for a 7900 XTX. This card is capable of any 1440p even if downclocked by 5 to 15 percent because of somewhat weak PSU. And no, don't you worry about your mobo being PCI-E 3.0 if you go 7900 XTX. Worry about your CPU not being 5800X3D xD

 

[GerKNG]

transients are pretty massive on RDNA2 but from my experience your PSU would only be on the edge if you would pair the GPU with a 13900K and overclock both.

 

[Marcus L]

Seems reasonable but not because of the reasons you stated (especially the 10% drop from the mobo which has nothing to do with reality: cards like 6800 XT lose no more than 1 percent if run at PCI-E 3.0 mode) and because the difference between your 5700 XT and 6800 XT is nothing to be impressed by. I'd rather go for a 7900 XTX. This card is capable of any 1440p even if downclocked by 5 to 15 percent because of somewhat weak PSU. And no, don't you worry about your mobo being PCI-E 3.0 if you go 7900 XTX. Worry about your CPU not being 5800X3D xD

40% on average in TPU's review at 1440p and nearly 50% at 4k, i'd add another 10%+- to those numbers through driver optimisations, the 6800 XT is by far a very decent upgrade from a 5700 XT, not too mention the xtx will cost +$600 than the 6800 XT

 

[gurusmi]

Nothing wrong with the be quiet calculator though, I use it myself as well.

Let's see if the calculators are fine. I'm building a new rig and got a new 1.000W PSU. The calculator says that i will need at least 852W. Worse because my actual PSU has 850W. Id the calculation is correct my system will work.

 

[Beginner Micro Device]

40% on average in TPU's review at 1440p and nearly 50% at 4k, i'd add another 10%+- to those numbers through driver optimisations, the 6800 XT is by far a very decent upgrade from a 5700 XT, not too mention the xtx will cost +$600 than the 6800 XT

That's the opposite of a very decent. It's just... "yes, it runs faster."

Very decent upgrade is going more than +150%.

 

[Cvrk]

Yeah in 2k, which is what i game in in tests i see 30-50 frames more for 6800xt.

Right now my 5700 xt can't hold 60 anymore in 2k. Dips in 50 or 40ish fps.


For about 380EUR i could 60+ anything & push my old rig 2 more years.

But yeah, you guys give me confidence that my PSU can handle.


The 4070TI from what Techpowerup shows has same energy consumption. But I can't find that card in my region on the second hand (not this year).

 

[P4-630]

Let's see if the calculators are fine. I'm building a new rig and got a new 1.000W PSU. The calculator says that i will need at least 852W. Worse because my actual PSU has 850W. Id the calculation is correct my system will work.

You could try and see what seasonic says.

 

[dgianstefani]

IMO should be fine, especially as it's a high quality PSU, not some bargain bin 650 W.

 

[damric]

650W is very marginal for 6800XT but you can lower the power limit a bit and not lose much performance at all.

 

[VuurVOS]

@Cvrk
650W for a 6800XT shoud be fine with your Seasonic power supply. I dont think you will have any issues.

My previous PSU was a Be quiet! Pure Power 10 CM 600W (Plus Silver) and it worked fine with a reference 6900XT
Although I switched after a month to a reference 6800XT Midnight Black which I still have.

 

[Double-Click]

You should be fine OP, especially since you're pairing this with a 65W chip.
Transient spikes can be a legitimate factor, but you have a very solid PSU (given their track record it likely should be rated @ even higher wattage).

 

[gurusmi]

You could try and see what seasonic says.

I did. But at Seasonic they do not care about my custom loop, fans, M.2 and Ram. Only to give you somke figures. In my new build there are
1 full custom water cooling loop with distroplate and 1 D5 Pump and a hell of LED.
12 Fans
up to 4 PCIe M.2 (2 & 4GB longterm, 2 for migration)
2 DDR5 Rams with 64GB.

It might sound not that much but they draw a hell of power.

 

[droopyRO]

Why don't you buy the card first, test it on your PSU and see if there are issued(i don't think there will be) ? Then you buy a new PSU or return the 6800XT get a RTX 4070

 

[Veseleil]

You'll be fine. Underclocking and undervolting is highly recommended for these cards anyway. Btw as I've read some nonsense replies, just to say that going from 5700XT to 6800XT will be a huge upgrade. Enjoy.

 

[Lew Zealand]

I used a 6800 XT with a nominally 65W Ryzen 5600 (really 76W or 100W w/PBO) for months on a 550W Corsair PSU with no problems. OC memory, UV and UC 50-100MHz from stock and it runs negligibly different compared to out of the box except for using 220W max (GPU Chip reported in GPU-Z, board total is 10-12% higher). However it was also fine running continuous benchmarks at its 313W (reported) +20% power limit as well. I've now swapped PSUs for a EVGA G3 650 to better match components and continue to have no problems. YMMV of course.

 

[maxfly]

If your PSU was built before 2019/20 you're much more likely see issues in games but benches generally wont trip ocp. If it was built after that your gtg. Either way, you won't know until you try it.

 

[AMF]

i have an 11 y/o psu on my nearly 2.8GHZ bost 6950xt no problems what so ever