AMD radeon 6000 series (big navi)

archae86
archae86
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vsral wrote:Also lowered

vsral wrote:
Also lowered clock speed (2200) because otherwise it would be hitting the memory thermal limits constantly. Using 70 watts less now compared to stock.

Interesting.  My least favorite aspect of my 5700 cards is the remarkably high reported memory temperature.  I keep them throttled down, and with the fans higher than default.  Otherwise I'd routinely see memory temperature above 100C.  Yikes.

I was hoping the Big Navi cards would take a more aggressive memory cooling approach.

I'm still hoping to get a 6800 XT at a reasonable price.  Just today, more showed up on eBay and secondary Amazon offerers than had been there.  none of those were reasonable prices, however.

mikey
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archae86 wrote: vsral

archae86 wrote:

vsral wrote:
Also lowered clock speed (2200) because otherwise it would be hitting the memory thermal limits constantly. Using 70 watts less now compared to stock.

Interesting.  My least favorite aspect of my 5700 cards is the remarkably high reported memory temperature.  I keep them throttled down, and with the fans higher than default.  Otherwise I'd routinely see memory temperature above 100C.  Yikes.

I was hoping the Big Navi cards would take a more aggressive memory cooling approach.

I'm still hoping to get a 6800 XT at a reasonable price.  Just today, more showed up on eBay and secondary Amazon offerers than had been there.  none of those were reasonable prices, however. 

Occasionally some show up on FaceBook Marketplace but you never know if they were used in mining or gaming or what? I guess alot like the Ebay ones.

vsral
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memory controller load is at

memory controller load is at 100% if I set the clockspeeds much higher. And then the memory junction temperature rises up to 100 degrees and then it will automatically downclock the card as a protection mechanism.

I already ordered a new case with better gpu cooling options (Sliger Cerberus, still only 18L volume).

So it looks to me like the memory controller is the limiting factor here (for this specific workload). I do have SAM enabled, don't kow if that changes anything.

 

Thinking of adding thermal pads between the backplate and the backside of the PCB where the memory modules are.

https://www.igorslab.de/en/the-hotspot-the-radeon-rx-6800-x-thermal-conductive-paste-exchange-and-correct-installation-sequence/

Paul
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Wow, good for you. I got that

Wow, good for you. I got that message about AMD offering direct reference parts, but they are also out now.

vsral wrote:

Also lowered clock speed (2200) because otherwise it would be hitting the memory thermal limits constantly. Using 70 watts less now compared to stock.

Uh, okay, this is off topic, but how did you do that?  Remember, I'm on Linux.

Keith Myers
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There are suitable Linux

There are suitable Linux alternatives for control of AMD cards.

https://github.com/Ricks-Lab/gpu-utils

 

vsral
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Sorry, don't know much about

Sorry, don't know much about Linux so can't help with that.

 

6900xt

Powerlimit -10%, max gpu freq 2220Mhz

With memory on 2120 Mhz:

- Best times on 4 task was around 12min50sec = 192,5 seconds/task

- Best times on 3 tasks: 9min34 (and was still going lower it seems) = 191,33 seconds/task

- 5 tasks would work somehow, stayed at 4 tasks with settings at 0.20

 

Setting memory back to stock (2000 Mhz)

- 3 tasks in 10min+

GPU memory 1,5 to 2 degrees cooler

 

Seems like memory speed is limiting factor here. (not an expert though, so please correct me).

One of the coming days I will try with thernal pads on backside of pcb to use the aluminum backplate as heatspreader.

If you can find a non-reference 6800 or 6800xt with more memory OC room (max on reference is 2150Mhz) and better vram cooling, that would be my preference (purely for Einstein).

mountkidd
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Keith Myers wrote: There are

Keith Myers wrote:

There are suitable Linux alternatives for control of AMD cards.

https://github.com/Ricks-Lab/gpu-utils

Another is radeon-profile

archae86
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vsral wrote:If you can find a

vsral wrote:
If you can find a non-reference 6800 or 6800xt with more memory OC room (max on reference is 2150Mhz) and better vram cooling, that would be my preference (purely for Einstein).

I, personally, currently have my eye on the XFX 6800 XT in the "upgraded thermal solution" MERC319 badging.  The trouble is, that the 6800 XT in general seems to be even scarcer in the market than either the 6800 or the 6900 XT, that XFX at list planned to charge a merciless $150 extra for the MERC319 flavor over base, and that all these things are not found save in high above list price secondary markets.

None of us knows how long the current iteration of cybercoin competition for these particular graphics cards will last.   But one thing that I suspect will last for a while is the applicability of an American 25% tariff.  It was originally imposed all the way back in May 2019, but there was an exemption which meant graphics cards did not suffer this, which expired December 31, 2020.

I'd not be surprised if the Biden Administration relaxes this as a sweetener in some round of negotiation with China, but would be very surprised if they reversed it on their own without give and take.  So not likely part of the Day 1 bonfire of previous administration policies.

So I don't expect to find any 6800 XT I actually want at anywhere near what were supposed to be list prices for months, if ever.  The only good news is that at the moment the aftermarket appetite for 5700 cards is strong enough that today I could almost certainly sell any of my current cards I liked for more than I paid for them a year ago.  That won't pay scalper price for a 6800 XT, but it could ease the pain some.

While I am pretty sure the MERC319 does huskier cooling than the base model, I am none too sure it has any special advantage on memory cooling.  Somehow that seems to be a weak point of the Navi 10 cards which has been inherited in the big Navi cards.

vsral
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Well, the Sapphire Nitro

Well, the Sapphire Nitro cards always have seperate memory cooling from the chip, but the reviews never mention the memory temps under einstein load.

 

Today I used thermal pads to use the metal backplate as heatspreader. Seems like it's working.

Exact same settings after 30min full load.

https://imgur.com/gallery/Q8AfqCZ

archae86
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Much to my surprise, this

Much to my surprise, this morning when I did my daily review of possible places to buy the specific XFX 6800 XT (MERC319) I've got my eye on, Best Buy showed it as something I could actually order.

However, when I clicked, I got an extra popup, explaining that while I had missed the one available at the moment I'd seen the availability indication, they were planning to do tiny incremental releases, and if I sat and waited for the color to change and was quick to click, I might just get one.

All this at $1050, which seems to be the "fair non-scalper" US price at the moment for the 6800 XT XFX MERC 319 card.  It is a stretch to suppose it is worth it by any rational computation.  Sometimes I'm not rational.

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