How many gpus can you run on an AMD AM4 socket motherboard? (Ryzen 7 1900, 2700 etc)

Message boards : Number crunching : How many gpus can you run on an AMD AM4 socket motherboard? (Ryzen 7 1900, 2700 etc)
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Message 1997339 - Posted: 8 Jun 2019, 2:46:37 UTC - in response to Message 1997317.  

The TDP for the 12core is the same as the 8 core 2700X. The rumored TDP of the 16 core is 125W or 135W.
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Message 1997387 - Posted: 8 Jun 2019, 11:29:58 UTC - in response to Message 1997339.  

The TDP for the 12core is the same as the 8 core 2700X. The rumored TDP of the 16 core is 125W or 135W.


Which would leave it out of safe reach of my TB350-BTC. Oh well.

Tom
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Message 1997873 - Posted: 12 Jun 2019, 0:43:43 UTC

Yesterday I finished setting up a Asrock B450 Pro4 motherboard.
It has 6 pcie slots. It has been flashed to the very latest bios so in theory it could run the Ryzen 9 cpus.

That version of the Bios does not have a "standard" toggle to enable "Above 4G" decoding to allow for a higher number of pcie devices.
It also will boot and crunch on all 6 gpu slots.
The only reason it is not doing that now is my office ran out of power "headroom" and 6 gpus started blowing the breaker.

The cpu is an Ryzen 2600 (6c/12t) and under "auto" it is crunching along at around 3.6Ghz.

So once I get my power to the office upgraded. And once I have the money for an Ryzen 9 3950x and once they start shipping it. I will have to decide if I want to try it out, probably on the Asrock MB.

My Biostar TB350-BTC appears to be a 1st generation AM4 motherboard so it doesn't support any of the improvements of the Zen+ cpus even though I am running a Ryzen 7 2700 on it.
The Asrock B450 Pro4 motherboard does seem to be a Zen+ MB but apparently because of the Bios flash update, all the extra toggles that I was expecting are not on there? And I haven't gotten my external bios flasher to work so I can't back flash and check.

In recap, it now looks like we have at least two AM4 motherboards below the X470/X570 models that will run at least 6 gpus.

Tom
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Message 1997976 - Posted: 13 Jun 2019, 1:11:38 UTC - in response to Message 1997873.  
Last modified: 13 Jun 2019, 1:11:58 UTC

Yesterday I finished setting up a Asrock B450 Pro4 motherboard.
It has 6 pcie slots. It has been flashed to the very latest bios so in theory it could run the Ryzen 9 cpus.
==Edit===
In recap, it now looks like we have at least two AM4 motherboards below the X470/X570 models that will run at least 6 gpus.

Tom


To test if the Asrock would boot/run more than 6 gpus I borrowed "several" gpus from my Biostar MB.

After a fair amount of tinkering I believe it is possible that the Asrock MB could run 7 gpus. However I didn't have time for any kind of extended run to see if it crashed pretty soon or not.
I am pretty sure it will not run 8 or 9 gpus.

Tom
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Message 1999165 - Posted: 22 Jun 2019, 13:59:18 UTC

Under the "I shoulda known" sub-thread...

I had managed to get my Biostar tb350-btc/Ryzen 7 2700 upto 3.9GHz under a pair of DDR4-3000 ram I had swapped in "temporarily" because I wanted to try the DDR4-3200 out on my "new" 2600.

I was not happy with the cpu processing with some of our latest tasks. Average processing had ballooned to over an hour. It looked like 3.9GHz was actually processing cpu tasks slower than 3.7GHz.

So I said, lets put some "3200" memory back in there. It "oughta" speed it up. Right?

All the settings in the bios (cpu voltage etc) crashed and burned causing the bios to do a re-set to default.

As of a little while ago I am back up to 3.7GHz with a much lower cpu voltage offset.

Tom
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Message 1999889 - Posted: 27 Jun 2019, 5:21:51 UTC - in response to Message 1999165.  

[quote]Under the "I shoulda known" sub-thread...
[quote]

Apparently exchanging two gtx 1060 3G's for gtx 1070's can screw it up too. Back at 100% defaults except for XMP#1 on ram, 4G decode and Mining mode in "above.... something". Not 6 gpu mode.

Tom
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Message 1999892 - Posted: 27 Jun 2019, 6:05:41 UTC - in response to Message 1999889.  

Must be the extra RAM on each card compared to the 3GB cards. You need more VGA memory workspace to map the card resources in the BIOS. The "Above 4G decoding" I guess is the solution.
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Message 1999908 - Posted: 27 Jun 2019, 12:30:46 UTC - in response to Message 1999892.  

Must be the extra RAM on each card compared to the 3GB cards. You need more VGA memory workspace to map the card resources in the BIOS. The "Above 4G decoding" I guess is the solution.


It was starting up ok, but then was quitting/app crashing later. The "Above 4G" was engaged. It looks like it is still running as of the moment in "almost" all default. Will start turning up the cpu multiplier today.

Tom
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Message 2007485 - Posted: 15 Aug 2019, 13:19:52 UTC

It turns out there is a difference in the # of gpu's you can run on a Biostar TB350-BTC.
With a 2700 cpu you can run 9 by using the "Over VGA?" in the mining toggle in the bios.
With a 2600 cpu you can only run 7. The "Over VGA?" toggle won't work (it boots back to the bios).

My current guess for running a Biostar TB350-BTC is run a Amd Ryzen 2700/2700x whatever you have. Disable the CPD and run "everything" else on auto except your ram which you can run using the XMP profile.

This should result in a pretty cheap, stable Seti cruncher with upto 9 gpus.

I have had significant trouble trying to overclock the cpu. But running on auto, the gpus still crunch as fast as they do.

I am NOT confident you can run an Amd Ryzen 9 3900x or 3950x on this MB even though the MB does have a Ryzen 3000 bios upgrade available (and that upgrade will run Ryzen 2600/2700 cpus.

Tom
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\\// Live Long & Prosper (starting tomorrow ;)
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Message 2007487 - Posted: 15 Aug 2019, 13:22:35 UTC

After significant testing on an ASUS Crosshair 7 Hero MB (using a 2700 cpu) I can say, so far, I can only get 6 gpus to boot. It dies in the POST when you go for 7.

That said, it has a lot of VRM resources and I expect to get high, stable cpu OC out of it (waiting on a new cpu cooler).

Tom
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Message boards : Number crunching : How many gpus can you run on an AMD AM4 socket motherboard? (Ryzen 7 1900, 2700 etc)


 
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