Generic Multiple GPU discusssion

Tom M
Tom M
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So far the highest core count

So far the highest core count listed in top 50 is 128. On a 20 core cpu (I think).

For the most part a lot of the high core CPUs actually seem to be using their native core counts.

Tom M

A Proud member of the O.F.A.  (Old Farts Association).  Be well, do good work, and keep in touch.® (Garrison Keillor)

Tom M
Tom M
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"The Roar of the Greasepaint

"The Roar of the Greasepaint – The Smell of the Crowd"

Now that I have 7 GPUs implemented here. (5 Rx 5700's, 2 Rx  5600 xt's) I have noticed a louder background "roar" which makes me very happy this system is living away from my bedroom :)

Is anyone else experiencing this kind of "roar"?  What are you doing to manage it?

Tom M

A Proud member of the O.F.A.  (Old Farts Association).  Be well, do good work, and keep in touch.® (Garrison Keillor)

San-Fernando-Valley
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Tom M wrote: ... Is anyone

Tom M wrote:

...

Is anyone else experiencing this kind of "roar"?  What are you doing to manage it?

...

 

 I avoided it by using "liquid cooling" ...

Stay safe and keep up your enthusiasm ...

Keith Myers
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Tom M wrote: "The Roar of

Tom M wrote:

"The Roar of the Greasepaint – The Smell of the Crowd"

Now that I have 7 GPUs implemented here. (5 Rx 5700's, 2 Rx  5600 xt's) I have noticed a louder background "roar" which makes me very happy this system is living away from my bedroom :)

Is anyone else experiencing this kind of "roar"?  What are you doing to manage it?

Tom M

I wear ear plugs at night.  And I also have liquid-cooling and it does not alleviate or reduce the roar.

The room fans exhausting the heat also add to the "roar"

 

archae86
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I've not liked fan noise and

I've not liked fan noise and spent trouble and money to mitigate it for about forever.  While I'm not in the league of you kings of multiple GPUs, the underlying principles remain:

1. value power economy--the less power you burn to get something done, the less noise made to get rid of the resulting heat.

2. Lots of fans

3. Big fans

4. run the fans as slow as will do the job (they can go slower if you have more of them)

5. expensive fans that make a bit less noise per unit air movement than far cheaper ones.

At the moment that means I have PC cases with about 6 mostly 120 mm Noctua fans, but spinning relatively slowly.

Another approach is open frames in a warehouse far from any humans, with big industrial fans making a racket no one hears.

But I don't belong in the thread, as, while I started running two GPUs in a box a long time ago when I noticed that Nvidia charged a lot more for little extra performance up at the top of their line, I've never run more than two.  Just this second I happen to have a 5700 and a 6800 running in the box I'm typing on, but it is not going very well.  (but the roar is OK)

Tom M
Tom M
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archae86 wrote: I've not

archae86 wrote:

I've not liked fan noise and spent trouble and money to mitigate it for about forever.  While I'm not in the league of you kings of multiple GPUs, the underlying principles remain:

1. value power economy--the less power you burn to get something done, the less noise made to get rid of the resulting heat.

I have just used the Radeon software to switch to "economy" mode.   I had noted when I overclocked my gpu's that is when the "roar" started.

Tom M

A Proud member of the O.F.A.  (Old Farts Association).  Be well, do good work, and keep in touch.® (Garrison Keillor)

Tom M
Tom M
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archae86 wrote:But I don't

archae86 wrote:

But I don't belong in the thread,

Peter,

I disagree.

archae86 wrote:
I've never run more than two.  Just this second I happen to have a 5700 and a 6800 running in the box I'm typing on, but it is not going very well.  (but the roar is OK)

Maybe I stated earlier that 2 GPUs do not qualify as "multiple GPUs" but if I did, I disagree with myself.  You are welcome here to discuss a topic VERY dear to my heart.  

"Trying to get two non-identical GPU models to play well together".

I have a long history of trying (and failing) to get things like an Rx 5700 and an Rx 570/580 to play together.  It turns out the Rx 580's at least may have had non-standard bios installed.  So I might get a chance to re-visit that experiment later.

I will start another message with my latest disaster.

Anyway, Peter.  Talk to us, please.

Tom M

 

 

 

A Proud member of the O.F.A.  (Old Farts Association).  Be well, do good work, and keep in touch.® (Garrison Keillor)

Tom M
Tom M
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Ah, "my latest disaster" is

Ah, "my latest disaster" is probably not a disaster but...

After I updated the bios on my MB and got 7 GPUs running on my top-performing rig all night, on Sunday morning I saw a BSOD with the error "driver overran stack buffer".

Since I am, once again, playing with "heterogenous" models of the same brand of GPU on the same system it looks like I have just "done it again".

However, these are all the same architecture of GPU. 

The "fallback" position of running "only" 5 Rx 5700's is working.  And the "final" fallback will be to re-deploy the Rx 5600 xt's onto a separate system.

So far I have 

  1. Upgraded the driver to the latest enterprise release (don't fix it).
  2. Switched to gen1 on Pcie buses and to an 8x by 8x on the PC16 bios entry. (didn't break anything but didn't help so far).
  3. Turned off all the overclocking/PBO but left the ram the built-in overclock. (untested at 6 GPUs).
  4. Turned off the serial port (untested).

I am currently running 5 RX 5700 GPUs in single-thread mode.  I have had them running up to 3 threads earlier today.  

My next test will be to add one of the Rx 5600 xt's back in.  An alternate test would be to see if I can run 4 Rx 5700's and an Rx 5600 xt without getting the "driver overran stack buffer" BSOD error.

Tom M

A Proud member of the O.F.A.  (Old Farts Association).  Be well, do good work, and keep in touch.® (Garrison Keillor)

Tom M
Tom M
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Tom M wrote: I am starting

Tom M wrote:

I am starting this thread so that anyone owning any system with more than 2 gpus can discuss their system(s).

I have changed my mind.  Multiple ~ Couple ~ 2 or more.

Tom M

 

A Proud member of the O.F.A.  (Old Farts Association).  Be well, do good work, and keep in touch.® (Garrison Keillor)

Tom M
Tom M
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Tom M wrote: My next test

Tom M wrote:

My next test will be to add one of the Rx 5600 xt's back in.  An alternate test would be to see if I can run 4 Rx 5700's and an Rx 5600 xt without getting the "driver overran stack buffer" BSOD error.

Tom M

I have made it back up to all 7 GPUs.  Running 2 threads per GPU.

If it is still up tomorrow when I am next available I will start at the top of the list of changes and back them out.  

One of the troubleshooting articles I googled mentioned stopping overclocking the CPU.  That was the last change I made.  And now "everything is groovy" (maybe).

Maybe PBO makes things unstable.  I dunno.

Tom M

A Proud member of the O.F.A.  (Old Farts Association).  Be well, do good work, and keep in touch.® (Garrison Keillor)

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