MPT - overvolt 6800XT to 1.2v is it safe ?

[Bernec]

Okay well you answered your own question. If you have a RX 6000 series card that has 1.2 V support, than 1.2 must be safe or AMD wouldn't have included it.

As for press-drivers conspiracy thing, it was just a thought of why mine has/had 1.2 as a option. You don't have an idea how things work in the background for a reviewers. We get new drivers, new vBIOS all the way up to launch. Some have bugs like say for example, more voltage or higher power limit, etc. I've received video cards and motherboards with engineering BIOS on them before. Someone forgot to flash it back before sending it out. If that is the case, the company in question will ask to use the newest non-bugged version for the review. But to end this, if the 6800 XT doesn't have 1.2 V support for retail, that is fine. I am wrong. The power limit, temp and freq limit in the drivers is just another hurdler to overcome. Set it to 1.2v with your software mod and call it a day.

Thanks for your answer. I'm sorry if I was an idiot earlier. I looked in several bioses from 6800xt 6900xt and 6950xt (air and watercooled) and since the gpu die its the same (just cut down on 6800XT vs 6900XT - hence C0 and C1 revisions) the die size is the same and I'm 90% sure some of it its cutdown on the 6800xt, I dont think the manufacturing process is in any way different between these two chips.

If one can do 1.2V safely (including the lower tiers ones 6750XT and so on) I dont believe the same chip but cutdown cant withstand 1.2V (talking about 6800xt). Red Devil from PowerColor is a huge card with great cooling I even think it outperforms the "mighty" Sapphires. (had a nice Vega64 Nitro+ LE from them)

Since my VMIN tweak (I've tested it) allows the gpu core to lower voltage for example during lower load it goes to 1.15V from 1.2V and in idle it runs perfectly normal at 0.8 0.6 and so on I consider this a free upgrade.

Also to the guys that said I will destroy the card well I change cards every generation mostly so if the cards lives 2-3 years its ok for me. Also this is a "softmod" that doesnt invalidate warranty. (at least the way I see it - I know some of you will tell me no that is not true - ok its fine).

 

[Hofnaerrchen]

Also to the guys that said I will destroy the card well I change cards every generation mostly so if the cards lives 2-3 years its ok for me. Also this is a "softmod" that doesnt invalidate warranty. (at least the way I see it - I know some of you will tell me no that is not true - ok its fine).

I doubt this will kill the card outright - and if it does: Not my problem - but it will shorten it's lifetime and if you get a new card every generation I guess you will sell your old one. I just wonder if you tell the buyers of your old hardware that it was running outside specs for 2-3 years? You don't have to answer that question. It's exactly for this reason I never have bought and never will buy used hardware.

 

[P4-630]

I just wonder if you tell the buyers of your old hardware that it was running outside specs for 2-3 years? You don't have to answer that question. It's exactly for this reason I never have bought and never will buy used hardware.

Exactly, a reason I also don't buy used hardware....

 

[Bernec]

I doubt this will kill the card outright - and if it does: Not my problem - but it will shorten it's lifetime and if you get a new card every generation I guess you will sell your old one. I just wonder if you tell the buyers of your old hardware that it was running outside specs for 2-3 years? You don't have to answer that question. It's exactly for this reason I never have bought and never will buy used hardware.

Of course I would tell them why not ? It would also say that it runs really close to 6900XT performance !

 

[noel_fs]

Personally if you want it to last long i wouldnt go over 1.15. if you have really good cooling and a good psu, 1.2 should be fine. Dont think its worth the impact on efficiency tho, you should be able to do 2600 on 1.15? My 6800 does 2420 (effective clock) at 1.025 with secondary frequencies also oc'd. vclk 1600 dclk 1400 fclk 2000, i suspect bumping vclk and/or dclk helps with infinity fabric overclock.

 

[Thimblewad]

I'm getting a stable sustained 2600 MHz at 1.100 V and stock power limits... What in the name..?

 

[myuaername]

So I got a pretty good bin that can do 2725 MHz at 1150 mV, I've been running at 1175 no problems. The power draw is high on synthetic applications, but quite reasonable when gaming. Your logic as to why it could take 1.2 V is exactly what I had in mind. I say go for it!

 

[Astawowski]

So I got a pretty good bin that can do 2725 MHz at 1150 mV, I've been running at 1175 no problems. The power draw is high on synthetic applications, but quite reasonable when gaming. Your logic as to why it could take 1.2 V is exactly what I had in mind. I say go for it!

Hi, I recently put my reference RX6800XT on water (stock cooler was terrible, often touching 110°C hotspot). Clock stability went up, some games were able to run ~2750Mhz. Of course power limit increased via MPT to 340W, then I decided to increase voltage as well.
1150mV -> 1162mV, small difference but significant for clock stability, now all games I tested can run ~2750Mhz stable. I just enabled TempDependentVmin and set both values to 1162mV. It looks like it works as ideally as I could have imagined. 1162mV is only while heavy load(game). DeepSleep, GFXOFF etc. is still enabled so when off load voltage goes down as before. Thus I don't think it will have any significant impact on GPU ageing (degredation). I wonder if there is a way to go past 2,8Ghz.

Thanks for your answer. I'm sorry if I was an idiot earlier. I looked in several bioses from 6800xt 6900xt and 6950xt (air and watercooled) and since the gpu die its the same (just cut down on 6800XT vs 6900XT - hence C0 and C1 revisions) the die size is the same and I'm 90% sure some of it its cutdown on the 6800xt, I dont think the manufacturing process is in any way different between these two chips.

If one can do 1.2V safely (including the lower tiers ones 6750XT and so on) I dont believe the same chip but cutdown cant withstand 1.2V (talking about 6800xt). Red Devil from PowerColor is a huge card with great cooling I even think it outperforms the "mighty" Sapphires. (had a nice Vega64 Nitro+ LE from them)

Since my VMIN tweak (I've tested it) allows the gpu core to lower voltage for example during lower load it goes to 1.15V from 1.2V and in idle it runs perfectly normal at 0.8 0.6 and so on I consider this a free upgrade.

Also to the guys that said I will destroy the card well I change cards every generation mostly so if the cards lives 2-3 years its ok for me. Also this is a "softmod" that doesnt invalidate warranty. (at least the way I see it - I know some of you will tell me no that is not true - ok its fine).

1,2V will surely cause the power draw to skyrocket, are you sure you can manage this excessive heat? Also, do you still have DeepSleep, GFXOFF, GFXULV on? If not, then your voltage never goes down which definitely can speed up gpu ageing.

 

[Cowboystrekk]

I would stick with the stock 1.15V, try maxing out vram, often more potential there, and you can usually get higher vram oc there since you can UV vram with MPT. On certain Hynix GDDR6 as shown by Bullzoid you can run voltage 100-200mv lower and OC more vs stock without increasing temps.

 

[Astawowski]

I would stick with the stock 1.15V, try maxing out vram, often more potential there, and you can usually get higher vram oc there since you can UV vram with MPT. On certain Hynix GDDR6 as shown by Bullzoid you can run voltage 100-200mv lower and OC more vs stock without increasing temps.

rx6800xt has samsung gddr6 not hynix

 

[Cowboystrekk]

rx6800xt has samsung gddr6 not hynix

Just an example you will probably experience the same, worth trying.

 

[Astawowski]

Just an example you will probably experience the same, worth trying.

from what I see in HWinfo, vram works at two voltages, 1,25V at idle and 1,35V at full load, you suggest lowering 1,35V to 1,25V ? Lower voltage = better stability? Does it make sense?

 

[Cowboystrekk]

from what I see in HWinfo, vram works at two voltages, 1,25V at idle and 1,35V at full load, you suggest lowering 1,35V to 1,25V ? Lower voltage = better stability? Does it make sense?

Yeah, you cpuld try that, maybe you get more OC headroom aswell, just watch temps

 

[Astawowski]

Yeah, you cpuld try that, maybe you get more OC headroom aswell, just watch temps

Ok, so i tried both undervolting them (1.35V -> 1.32/1.3/1.25V) no improvements just instability, same with overvolt to 1.38V. So it looks like stock 1,35V is the best for them. Btw, do you think I should worry or do something if my custom water AIO cooled rx6800xt has max 45°C edge and 87°C hotspot at 340Wats? It is a huge difference.