7900 XTX lowering power

[GrimReaper85]

Hi,
How much do you lose at 250W, 270W and 300W?
I would guess around 80%, 85% and 90%?

Can anyone with 7900 XTX test that? Possibly 3DMark Steel Nomad. I know you have to first find the right max frequency to get to that power. I think you should try 1800-2200 MHz if stock is 2500 MHz to get to 250-300W.

Not that it will matter much in 3 and a half weeks once 9070 XT releases. But they might still mess up the release and 9070 XT will be 1000€, you never know with AMD. At 1000€, 7900 XTX at 900€ might still be a better buy.

[Schnitzl]

Hi,
How much do you lose at 250W, 270W and 300W?
I would guess around 80%, 85% and 90%?

Can anyone with 7900 XTX test that? Possibly 3DMark Steel Nomad. I know you have to first find the right max frequency to get to that power. I think you should try 1800-2200 MHz if stock is 2500 MHz to get to 250-300W.

Not that it will matter much in 3 and a half weeks once 9070 XT releases. But they might still mess up the release and 9070 XT will be 1000€, you never know with AMD. At 1000€, 7900 XTX at 900€ might still be a better buy.
i have the 7800XT but i will try to explain what i know

ok, first of all, the 7900XTX is not as bad as everyone says.
now there is the but:
all is inside the adrenaline driver, with a not understandable limitation: see picture right side bottom "power limit"
maximum is -10% :freak:

so step 1: put that -10%
step 2: limit max frequency to [EXAMPLE!] 90% (i dont know why it ever gets back to 91 in my case :rolleyes: )
step 3: limit voltage to [EXAMPLE!] 95%
(step 2 and 3 is not a must)

these numbers should work with every card unless you have no fan in the case or the temperature in your room is 40+ °C ;)

Now the good part depending on the games you have and which refresh rate and resolution you are using.
Ingame frame limiters are to be preferred to the driver-based frame limiter.

4k playing as well as Alan Wake 2 or Cyberpunk may not benefit at all from the "frame limit method"
other games do:
https://www.computerbase.de/artikel/grafikkarten/amd-radeon-rx-7900-xtx-xt-test.82703/seite-5#abschnitt_leistungsaufnahme_spiele_youtube_desktop
scroll down until diagram "Leistungsaufnahme beim Spielen"
at 1440p you can save more than 100W by limiting frame rate to 144fps

of course that is not specific to 7900XTX, as you see the 4090 uses 200W less in the given example!

it can be further improved by adjusting (reducing) ingame settings
in my case (another example) I invested around 20-30 minutes for Wukong.
It looks almost like everything maxxed, frame limit 90
the 7800XT (normal 248W) is around 200W, mostly below

older games save even more. My favourite, Diablo2 Resurrected, frame limit 90: max 145W

so back to your initial question: you will loose not that much. But there are additional ways to reduce the powerdraw of the graphics card in general depening on game, resolution and fps :)

[Wiseman]

Hi,
How much do you lose at 250W, 270W and 300W?
I would guess around 80%, 85% and 90%?

Can anyone with 7900 XTX test that? Possibly 3DMark Steel Nomad. I know you have to first find the right max frequency to get to that power. I think you should try 1800-2200 MHz if stock is 2500 MHz to get to 250-300W.

Not that it will matter much in 3 and a half weeks once 9070 XT releases. But they might still mess up the release and 9070 XT will be 1000€, you never know with AMD. At 1000€, 7900 XTX at 900€ might still be a better buy.

Which AMD graphics card have you got currently?

[Micha80]

Maybe similar to 7800XT

https://www.reddit.com/r/Amd/comments/1afspn4/rx_7800_xt_optimizing_efficiency_huge_effect/?tl=de&rdt=40801#:~:text=Im%20Originalzustand%20erreicht%20die%20RX,pro%20Watt%20(%2B38 %20%25).

[GrimReaper85]

Which AMD graphics card have you got currently?
Already sold 7800 XT, now on some "cheap" hot and loud 4070 SUPER ASUS Dual EVO. Will probably just keep this card as a backup in case of releases like RTX 50 and most probably also RX 9000.

2300 MHz and 1070 mV and 220W and 101% stock performance is not that great from that Reddit thread, I had 2500 MHz, 1030 mV, 225W and 102% stock performance. OK, so not much difference, I mean more for frequency and voltage.
If 7900 XTX is anything similar to 7800 XT, then that would mean 225W and 88% of stock performance. That means 7900 XT or almost 4070 Ti SUPER performance at only 75% power consumption. That would be too good to be true and they should sell like hot cakes in that case.
And this is the answer I got on Techpowerup, which would make sense as it is a larger chip and 384-bit also costs power:
At least 5 outta 10 samples can save all 100% performance (= reference model at stock settings) at a 300 W cap. Will definitely lose at least a couple % at 270 W. About 10%, at 250 W. Sweet spot is around 280 to 300 W, depending on silicon lottery. This is without RT.
under 300W it drops significantly but over 350W it barely does anything.

So 300W and stock performance.
https://www.3dcenter.org/artikel/fullhd-ultrahd-performance-ueberblick-2012-bis-2024
7900 XTX - 540%, 350W, 154%/100W
7900 XTX undervolted - 540%, 300W, 180%/100W
4080 - 510%, 297W, 172%/100W
4070 Ti SUPER - 438%, 277W, 158%/100W
So that makes for a good efficiency. Though with PL 238W and even no OC I got 95% stock performance on 4080:
4080 @238W - 485%, 238W, 204%/100W, but when you take price into account, 4080/4080S were €1250-1400 and 7900 XTX around €900. That's 30% less money for 15% worse efficiency.
4090 @300W - 605% (it had 89% stock performance), 300W, 202%/100W, but this card costed 2 times more for only +12% performance of 7900 XTX @300W

OK, so really not that bad of a card, up to 300W is still acceptable to me. If 9070 release will go wrong, then 7900 XTX would definitely be an upgrade to 4070 SUPER.


Another question, Mindfactory is full of bad reviews about driver errors. I already had 6900 XT with 1200 mV so I know this is not a bad driver, but problem with card stability. Do they really overclock these cards too much from the factory or are there other reasons for instability?
There was a thread here, let me read that first:
https://www.forum-3dcenter.org/vbulletin/showthread.php?t=617490
EDIT: Reading this topic, I should have lowered RAM speed even further. Before buying 6900 XT I had problems at 4400 CL17 and had to set XMP 4000 CL16, but of course XMP is still OC. And I upgraded power supply Corsair AX760 (this one was resetting the PC like crazy, too weak for stock 6900 XT) to Corsair HX1200 once I got driver errors, but still got them with 1200W.

[Haarmann]

GrimReaper85

Very loud indeed a 4070 Super Dual EVO from ASUS - but can reach 23k in Timespy if maxed out a lil.

If you have a 7900 Series from AMD - this is different to the 7800. You can lower the voltage very often below 1 V.

When you lower the max cloxkspeed you can lower the voltage even a lil more very often.

So for tuning I prefer the 7900 Series.

Of course my prime target is more performance in most of the cases. I will just use Timespy for this comparison.

With 15% more power consumption a ASUS 7900 XT TuF Series got around 33k in Timespy. With 10% less power consumption there were still 29.5k leff.
So you waste a hell lot of power for the final 10% in performance.

If you lookup the score in the list linked - thats pretty ok.

https://www.computerbase.de/artikel/grafikkarten/3dmark-time-spy-benchmark.88185/