• Competitor rules

    Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.

The Radeon RX 7900 XT(X) Owners Thread.

GoogalyMoogaly said:
My card seems to crash if I lower the voltage or change the clock speed by more than a tiny about.

Think I lost the silicone lottery on this one and will just wait for the Nvidia 5000 series cards and upgrade.
Click to expand...
That’s odd I’m able to dial down the max clock to 2000 with no problems.
 
Why not just reduce the power limit if you want to reduce power usage? That way the card will boost to whatever it can depending on the power budget you set.

Surely if you running the card at 2000mhz you should have saved some money and bought a slower card.
 
SpudMaster said:
Why not just reduce the power limit if you want to reduce power usage? That way the card will boost to whatever it can depending on the power budget you set.
Click to expand...
With the Radeon's you can only adjust this to a minus 10% PL max, it isn't like the Nvidia cards (via AB) where you can take them all the way down. Reducing clocks is the only way to get further power saving gains atm.
 
SpudMaster said:
Why not just reduce the power limit if you want to reduce power usage? That way the card will boost to whatever it can depending on the power budget you set.

Surely if you running the card at 2000mhz you should have saved some money and bought a slower card.
Click to expand...

Exactly this. The best way to lower power usage on a 7900 GPU is to lower the power limit.

I have a 7900 XT pulse and set a power limit that uses no more than 280w and also under volted, OC on VRAM, set better timings and overclocked the max clocks.

All in all I got a 5% faster GPU that uses less power and runs cooler.

Maxing everything with a mild under volt got me about ~13% extra performance at about 330w. Not a bad overclock, but I prefer the less than 10% slower and more efficient settings.
 
ICDP said:
Exactly this. The best way to lower power usage on a 7900 GPU is to lower the power limit.

I have a 7900 XT pulse and set a power limit that uses no more than 280w and also under volted, OC on VRAM, set better timings and overclocked the max clocks.

All in all I got a 5% faster GPU that uses less power and runs cooler.

Maxing everything with a mild under volt got me about ~13% extra performance at about 330w. Not a bad overclock, but I prefer the less than 10% slower and more efficient settings.
Click to expand...
100% agree. Except older games where I strangle the power and max clocks. World warships runs at 100fps with 2000mhz and huge under volt. For triple a games 450watts is the only way to fly :D
 
JediFragger said:
With the Radeon's you can only adjust this to a minus 10% PL max, it isn't like the Nvidia cards (via AB) where you can take them all the way down. Reducing clocks is the only way to get further power saving gains atm.
Click to expand...

True but your wanting to run at 2000mhz then you've bought the wrong card but if your just wanting to reduce power for older game then use Radeon Chill and limit the fps to whatever you want. The card will then only boost to what's necessary to maintain the set fps. When I play Street Fighter 6 the game is limited to 60 fps as that's how fighting games tend to work so my 7900XT only boosts to ~1300mhz and uses ~90w. Would be the same if you use Chill to reduce to the FPS on older games.
 
Last edited:
Yes, there are better ways in Adrenalin to limit power use than limiting clocks. That’s like using a hammer to crack a nut. Radeon Chill is a perfect example, or just set an FPS limit.
 
I’m posting this purely to help some people understand the nuances of 7900 overclocking.

7900 XT, 7800 X3D, DDR5 6000 C30 RAM. 1440p Ultra 3D Mark Nomad results.

Stock 7900 XT = 54.19 FPS average. 318w power draw, max clocks achieved 2323 MHz

All stock apart from undervolt to .970 mV = 57.77 FPS average. 318w power draw, max clocks achieved 2604 MHz

Power limit set to +15%, undervolt to .960 mV, VRAM 2700 with fast timings = 61.93 FPS average. 367w power draw and max clocks 2761 MHz. This is a 14.7% performance increase.

My tuned for lower power draw settings are .975 mV, -10% power limits (minus 10%) and 2700 VRAM with faster timings. This results in 57.77 FPS average and a power draw of 285w. This gives a 7% increase in performance for a 33w reduction in power draw.

For reference, dropping max clocks to 2000 MHz results in a 13% performance drop and 250w power draw. Maybe just get a cheaper 7900 GRE ;)

Conclusion: if you want to reduce power and maintain, or increase performance. Set a lower power limit and undervolt as much as it needs to remain stable. Increasing core clocks does nothing.
 
Last edited:
ICDP said:
I’m posting this purely to help some people understand the nuances of 7900 overclocking.

7900 XT, 7800 X3D, DDR5 6000 C30 RAM. 1440p Ultra 3D Mark Nomad results.

Stock 7900 XT = 54.19 FPS average. 318w power draw, max clocks achieved 2323 MHz

All stock apart from undervolt to .970 mV = 57.77 FPS average. 318w power draw, max clocks achieved 2604 MHz

Power limit set to +15%, undervolt to .960 mV, VRAM 2700 with fast timings = 61.93 FPS average. 367w power draw and max clocks 2761 MHz. This is a 14.7% performance increase.

My tuned for lower power draw settings are .975 mV, -10% power limits (minus 10%) and 2700 VRAM with faster timings. This results in 57.77 FPS average and a power draw of 285w. This gives a 7% increase in performance for a 33w reduction in power draw.

Conclusion: if you want to reduce power and maintain, or increase performance. Set a lower power limit and undervolt as much as it needs to remain stable. Increasing core clocks does nothing.
Click to expand...
And are you doing this all from directly in Adrenalin too? I've not considered making any changes but I'll never turn down free performance for less power draw.
 
GoogalyMoogaly said:
Would be nice to be able to undervolt without it crashing (1050mV seems stable so far).
Click to expand...

As always it’s the silicon lottery at play. Mine goes down to .960 stable but I leave it a .975 just for the extra insurance.

The lower you can set the core voltage, the more the GPU will boost within your set power limit. That’s why setting minus 10 on the power limit with a good undervolt results in a decent reduction in power draw with a 5% plus performance boost.

In your case with 1050mV you should be able to achieve stock speeds with 285w power draw. Set VRAM to high timing and about 2650 or 2700 if possible, as well as -10% on power limits.
 
I had another go, to see if my 7900XT had changed its mind. It's been a while since I tried pushing the volts lower, but no, 3DMark Nomad bails halfway through if I set it to 1000mV.

On Radeon Chill, I've tried it in the past but I think I could feel/see its behaviour and effect on framerate while playing CP2077. Didn't like it.

My current settings are
  • 1075mV
  • -10 power
  • 2400core cap
  • 2600mem cap
  • = same FPS as stock, 287W, quieter fan
I do still tend to set a max Core, as 2400MHz is generally where it's at during games anyway and might reduce spikes? It's a me thing ;) . Actually, just checked, I don't have it capped...

FYI if I max the power with my undervolt the 7900XT Pulse gets this:
  • 1075mV
  • +15 power
  • 2702 core max
  • 2600 mem cap
  • = +8.5% FPS over stock, +16% (373W) power over stock, louder fan (obviously)
 
ICDP said:
I’m posting this purely to help some people understand the nuances of 7900 overclocking.

7900 XT, 7800 X3D, DDR5 6000 C30 RAM. 1440p Ultra 3D Mark Nomad results.

Stock 7900 XT = 54.19 FPS average. 318w power draw, max clocks achieved 2323 MHz

All stock apart from undervolt to .970 mV = 57.77 FPS average. 318w power draw, max clocks achieved 2604 MHz

Power limit set to +15%, undervolt to .960 mV, VRAM 2700 with fast timings = 61.93 FPS average. 367w power draw and max clocks 2761 MHz. This is a 14.7% performance increase.

My tuned for lower power draw settings are .975 mV, -10% power limits (minus 10%) and 2700 VRAM with faster timings. This results in 57.77 FPS average and a power draw of 285w. This gives a 7% increase in performance for a 33w reduction in power draw.

For reference, dropping max clocks to 2000 MHz results in a 13% performance drop and 250w power draw. Maybe just get a cheaper 7900 GRE ;)

Conclusion: if you want to reduce power and maintain, or increase performance. Set a lower power limit and undervolt as much as it needs to remain stable. Increasing core clocks does nothing.
Click to expand...

Those look like nice results, only 10fps behind an oc XTX on your max speed settings
 
You must log in or register to reply here.
Back
Top Bottom