The Radeon RX 6900/6950 XT Owners Thread.

[Too Tall]

Decided to return that Ultimate with the adhesive on the Memory.

Its not somthing I've seen on any other 6900 XT I've seen.

 

[varkanoid]

Thank you. Got it working now and edited the original post.

Yeah just need 90 degrees to the left now.

 

[varkanoid]

Most of us overclockers are using MPT to get some extra performance. When benching I run 425W on the PL and 400A on the TDC in MPT.

So I take it you have played with the settings a lot more since you did https://www.overclockers.co.uk/forums/posts/34438292

think I will have a tinker when I get chance.

 

[LtMatt]

So I take it you have played with the settings a lot more since you did https://www.overclockers.co.uk/forums/posts/34438292

think I will have a tinker when I get chance.

So I take it you have played with the settings a lot more since you did https://www.overclockers.co.uk/forums/posts/34438292

think I will have a tinker when I get chance.

Yes, things have changed since then.

WHat are you looking to do, overclock to the gills or just extend power limits a little for a 24/7 gaming overclock?

Decided to return that Ultimate with the adhesive on the Memory.

Its not somthing I've seen on any other 6900 XT I've seen.

Furry muff. Gonna try your luck with another one?

 

[Loxa]

Is sam (smart access memory) worth enabling? Will it increase temps or would it affect an overclock or undervolt stability?

 

[varkanoid]

Yes, things have changed since then.

WHat are you looking to do, overclock to the gills or just extend power limits a little for a 24/7 gaming overclock?

I was going to go for a better result in Timespy and then look at a undervolt gaming profile.

 

[LtMatt]

Is sam (smart access memory) worth enabling? Will it increase temps or would it affect an overclock or undervolt stability?

Damn straight it's worth enabling. Improves scores in most games from testing. Some games a few % improvement, some 10% or more.

 

[Loxa]

Damn straight it's worth enabling. Improves scores in most games from testing. Some games a few % improvement, some 10% or more.

Ok, would you recommend updating my bios before enabling or because everything works fine atm just skip it and enable sam.

 

[LtMatt]

I was going to go for a better result in Timespy and then look at a undervolt gaming profile.

I used this for my Timespy score.

AMD Radeon RX 6900 XT video card benchmark result - AMD Ryzen 9 5950X,ASUSTeK COMPUTER INC. ROG CROSSHAIR VIII HERO (3dmark.com)

For undervolt just click Delete SPPT in MPT and restart, then undervolt in Radeon Software.

Start out at 2479 max frequency and 2379 min frequency. Set voltage to 1100mv, and reduce in 10mv increments until you hit stability in extended testing. I got my sample down to 1040mv before i started getting stability issues.

Seen others get around 1075mv+, so your mileage will vary.

 

[LtMatt]

Ok, would you recommend updating my bios before enabling or because everything works fine atm just skip it and enable sam.

I would use BIOS 3003, for me it has the highest boost frequencies for Ryzen 5000 series CPUs and the lowest Aida64 latency. Using a Crosshair VIII Hero myself and 3003.
ROG Crosshair VIII Formula | ROG Crosshair | Gaming Motherboards｜ROG - Republic of Gamers｜ROG United Kingdom (asus.com)

Use that BIOS, enable SAM, tune your memory frequency/timings, enable PBO, set scalar to x10, set PBO limits to manual and put 500, 500 and 500.

Optional but very time consuming, enable curve optimiser and fine tune each core using negative offset voltage one by one to squeeze out the last 5% from the CPU performance.

Can dig you out a video to get you started on curve optimiser if required?

 

[CantingSoup]

Yeah just need 90 degrees to the left now.

Fixed.

 

[Godhand007]

If you have The Division 2 then run any overclock in that for a couple of hours, it's utterly the harshest game I know for overclocks.

Literally can not barely do ANY tweaking to my 6800XT Nitro in that game

It seems Division 2 demo is available for a try. I tested it with my stable OC without any issues.

 

[LtMatt]

It seems Division 2 demo is available for a try. I tested it with my stable OC without any issues.

Did you manage to try out Resident Evil Village yet? I found that draws a lot of wattage at max settings. Not saying it is the most strenuous thing out there though.

 

[FredFlint]

I would pay a bit more for the XTXH version of the 6900 XT If i was doing it all again as it is definitely faster than the regular 6900 XT due to the higher voltage and power limits available.

Is the XTXH a different PCB or is it just different BIOS? has anybody tried flashing a standard 6900XT with an Ultimate BIOS?

 

[LtMatt]

Is the XTXH a different PCB or is it just different BIOS? has anybody tried flashing a standard 6900XT with an Ultimate BIOS?

Yes doesn't work.

XTXH is the best silicon quality 6900 XT, faster than regular 6900 XT. 200Mhz higher boost clocks, faster memory, 1.2v voltage available and higher power limits.

The true competitor to the 3090.

 

[Deleted member 66701]

Yes doesn't work.

XTXH is the best silicon quality 6900 XT, faster than regular 6900 XT. 200Mhz higher boost clocks, faster memory, 1.2v voltage available and higher power limits.

The true competitor to the 3090.

Is it still limited/locked to 2150mhz though?

 

[LtMatt]

Is it still limited/locked to 2150mhz though?

Good question, think it is. Also it might be the MBA 6900 XT LC that has the faster memory and higher memory speeds, but the rest is definitely correct.

 

[Deleted member 66701]

Good question, think it is. Also it might be the MBA 6900 XT LC that has the faster memory and higher memory speeds, but the rest is definitely correct.

I have an XTXH - I can test. What would I see if I push it to 2250mhz and it was actually locked? When I click auto mm overclock it actually comes back as 2250mhz.

 

[LtMatt]

I have an XTXH - I can test. What would I see if I push it to 2250mhz and it was actually locked? When I click auto mm overclock it actually comes back as 2250mhz.

Oh, well if it goes above 2150Mhz then I guess I was right initially. You need to validate that performance is increasing though despite the clock going higher. I see gains up to 2124 on the regular XTX. Anything higher hurts performance.

 

[Deleted member 66701]

ah, tried 2250 and 2200 and I get classic mem artifacting, so I guess that answers that question!