Question Unlock voltage limit on RX 6800 XT ?

[OzN3]

Hello i recently got a STRIX LC RX 6800 XT which has a 240mm AIO. Is there any way to unlock the voltage limit ( 1150mv )? I reach a maximum of 2675mhz but i would like to reach 2700mhz at least. Temperatures while gaming are very good ( max hotspot 75 degrees ) so i would try to increase the core clock. For doing this, i need to increase the voltage and i would like to know if there is any software who allows that, without BIOS mod. Thanks in advance.

 

[helpstar]

AMD RX 6800 Overclocking and Undervolting - from over 240 watts to under 180 watts, it’s all there | igor´sLAB

The overclocking limit of the Radeon RX 6800 XT isn’t particularly large, so the cheaper RX 6800 already looks much more interesting. But you won’t be able to pull out any trees here either…

www.igorslab.de

maybe with this tool it´s possible

 

[OzN3]

AMD RX 6800 Overclocking and Undervolting - from over 240 watts to under 180 watts, it’s all there | igor´sLAB

The overclocking limit of the Radeon RX 6800 XT isn’t particularly large, so the cheaper RX 6800 already looks much more interesting. But you won’t be able to pull out any trees here either…

www.igorslab.de

maybe with this tool it´s possible

Thank you! Do you also know which limit i have to set? Power limit, tdc limit ecc.. If i set the mv limit to 1200 i should increase power limit and tdc limit i think… am i right?

 

[helpstar]

sorry, I´m not that familiar to OC

 

[OzN3]

sorry, I´m not that familiar to OC

I can manage power limit and tdc limit but when i set the voltage limit to 1200mv or 1175mv i have some issue… in adrenaline i can set 1200mv but when i run the card i got 1018mv limit and it crashes… i’ll try to search something about. Thank you anyway!

 

[hotaru.hino]

Hello i recently got a STRIX LC RX 6800 XT which has a 240mm AIO. Is there any way to unlock the voltage limit ( 1150mv )? I reach a maximum of 2675mhz but i would like to reach 2700mhz at least. Temperatures while gaming are very good ( max hotspot 75 degrees ) so i would try to increase the core clock. For doing this, i need to increase the voltage and i would like to know if there is any software who allows that, without BIOS mod. Thanks in advance.

There isn't, because, at least from I read, the drivers impose a 1.2V limit.

And unless you're trying to gain e-peen points on 3DMark or something, 25MHz on top of 2675MHz is going to do almost nothing in terms of performance gains in games.

 

[drea.drechsler]

I can manage power limit and tdc limit but when i set the voltage limit to 1200mv or 1175mv i have some issue… in adrenaline i can set 1200mv but when i run the card i got 1018mv limit and it crashes… i’ll try to search something about. Thank you anyway!

Undervolting usually gives much better performance results than overclocking, especially when a higher voltage is needed for stability. That's because the GPU is thermally limited since it can't shed heat out of the die fast enough; a common problem now with 7nm and smaller geometry. Using liquid cooling certainly helps but it's a problem of getting the heat out of the silicon more than anything else. So the 1.200V limiter isn't really an issue unless trying to experiment with something like LN2 cooling for overclocking demonstrations and competitions.

There's also a limit to how far you can undervolt. Most 6800XT's are capable down to around 1.050V. Mine will pass benchmarks that low but I get problems such as audio distortion and failure to boot up so I run it around 1.075V. 1.125V is needed if running Folding@Home, which performs complex GPU calculations, to avoid processing errors that fail work units.

If you're eager to get into extreme overclocking the thing to look for is More Power Tool and Red Bios Editor. They are the way to overcome several of the card limits. It also allows increasing power budget. But this is definitely the way to burn up your card...and possibly your PSU or maybe the whole rig if you aren't careful.

 

[OzN3]

Undervolting usually gives much better performance results than overclocking, especially when a higher voltage is needed for stability. That's because the GPU is thermally limited since it can't shed heat out of the die fast enough; a common problem now with 7nm and smaller geometry. Using liquid cooling certainly helps but it's a problem of getting the heat out of the silicon more than anything else. So the 1.200V limiter isn't really an issue unless trying to experiment with something like LN2 cooling for overclocking demonstrations and competitions.

There's also a limit to how far you can undervolt. Most 6800XT's are capable down to around 1.050V. Mine will pass benchmarks that low but I get problems such as audio distortion and failure to boot up so I run it around 1.075V. 1.125V is needed if running Folding@Home, which performs complex GPU calculations, to avoid processing errors that fail work units.

If you're eager to get into extreme overclocking the thing to look for is More Power Tool and Red Bios Editor. They are the way to overcome several of the card limits. It also allows increasing power budget. But this is definitely the way to burn up your card...and possibly your PSU or maybe the whole rig if you aren't careful.

so… would i have a better performance at 2600mhz 1100mv then 2675mhz 1143mv? Just an example.. i think this is valid only for heavy benchs like time spy or something like that, because in game i rarely have more then 75 degrees to the hotspot.

 

[drea.drechsler]

so… would i have a better performance at 2600mhz 1100mv then 2675mhz 1143mv? Just an example.. i think this is valid only for heavy benchs like time spy or something like that, because in game i rarely have more then 75 degrees to the hotspot.

For MY card, most definitely the lower clock/voltage would be better. But my 6800XT (MSI Gaming Z Trio) is using an air cooler and will over heat like mad at that high of a clock and voltage which pulls back clocks. I've found 2500Mhz and 1075mV to be the best all-around for gaming but 2450 benches better. For you I can't say what the 'sweet spot' s because you're using an AIO cooler.

You have to run benchmarks to compare performance. The preferred benchmark, btw, is TimeSpy. If you compare to other scores only compare the Graphics score, not the Total score which includes CPU performance. You can also run your game's BM routine if it has one.

Whatever clock you're running at, lower the voltage as much as you can to get better performance. Lower voltage helps it run cooler which keeps it from pulling back on clocks under heavy load. If heat is proving to be a problem (hot spot temp going over 100C, for instance, causing the card to pull down clocks considerably) then lower the card power budget a couple %.

 

[OzN3]

It's not my case i think... i've got to be stable at 2675mhz with 1137/1143mv and max 82 degrees to the hotspot while running time spy extreme (62/63 degrees on gpu). I score 10400/10500 points on gpu, that's an high score compared to others. But maybe, i'll try to lower the clock speed and the voltage to compare better...

 

[drea.drechsler]

It's not my case i think... i've got to be stable at 2675mhz with 1137/1143mv and max 82 degrees to the hotspot while running time spy extreme (62/63 degrees on gpu). I score 10400/10500 points on gpu, that's an high score compared to others. But maybe, i'll try to lower the clock speed and the voltage to compare better...

Your 240mm AIO does seem to help keeping temperature in check. With my settings (2500Mhz/1075mV/2100Mhz memory) and using stock air cooler my 6800XT is pulling around 9950 score, hotspot temp also peaking in low-mid 80's. But your setup giving only a 5% score improvement seems to also show why so many say it's not worth putting in the effort and expense.

Even so, it will definitely be interesting to see what you get using similar clock speed and the much lower voltage the AIO allows. Watch how clock varies through the BM run (Afterburner makes that easy with Rivatuner OSD and graphing tool). The longer it can keep hotspot temp in the 70's (or 60's even) it should hold a clock much closer to the clock you set it at through more of the BM run. The thing to keep in mind is it's not the clock you can set it at that matters so much even if it's stable: it is the clock the GPU will run at in the BM (or game) that matters and that varies with temperature and allowed voltage.