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Author Topic: 8 GPU limit linuxcoin  (Read 3780 times)
DeathAndTaxes
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Gerald Davis


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November 08, 2011, 11:49:20 PM
 #21


Nice reference.  I was completely wrong (it happens sometimes) looks like max draw is limited by slot size although the same physical connector is used.  So yeah likely a board w/ mostly 1x connectors is not expecting 100W+ draw from the slots.
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likuidxd
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November 09, 2011, 12:02:16 AM
 #22

Shit happens, I was wrong too.

I wouldn't trust the GD70 or GD80 boards to take that kind of abuse. The Big Bang and Supercomputer though may be able to handle it as they were built for closer to the abusive application that we miners use them for. You pay a hefty price for them though. I can speak in high regard for the Big Bang personally, mine runs 8 gpus with all slots populated and it doesn't seem to phase it.

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Gerald Davis


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November 09, 2011, 02:49:56 PM
 #23

Both Windows and Linux are limited to 8 cores on 64bit and 4 cores on 32bit.

Is this right? I can use more than 4 gpus in windows 7 64 bit?Huh  This would be awesome

Yes.  I have run both 4x5970 and 3x5970 in Windows 7 x64.
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Gerald Davis


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November 09, 2011, 03:02:26 PM
 #24

Very awesome, Thank you for your quick reply.

I do not know why I was under the impression I could only run 4.

Peace

One of the more recent driver changes enabled 8 GPU.  I can't remember which one but using most recent driver will give you >4.
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November 09, 2011, 03:04:00 PM
 #25

I run several 5850systems with 4-7 of them on one Board without problems under win7 x64 (Home Premium and Proffessional)
Catalyst 11.4 - 11.10rc

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November 10, 2011, 01:03:41 AM
 #26

I run several 5850systems with 4-7 of them on one Board without problems under win7 x64 (Home Premium and Proffessional)
Catalyst 11.4 - 11.10rc

I'd stay away from installing CCC by all means possible. When going beyond 4 gpus there is a problem that AMD is not attending to with CCC resulting in BSOD. Install drivers but stay away from CCC.

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November 10, 2011, 02:38:13 AM
 #27

I run several 5850systems with 4-7 of them on one Board without problems under win7 x64 (Home Premium and Proffessional)
Catalyst 11.4 - 11.10rc

I'd stay away from installing CCC by all means possible. When going beyond 4 gpus there is a problem that AMD is not attending to with CCC resulting in BSOD. Install drivers but stay away from CCC.

May I ask how you know the BSOD is attributed to the CCC.  I also install the CCC express install, I have 5 6950's running full tilt on win764 cgminer. and ltc'ing with the other 3 cores.

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teh giant catfesh


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November 10, 2011, 11:38:27 AM
 #28

If its the same issues as with windows its a hardware limit based on resources.
Both Windows and Linux are limited to 8 cores on 64bit and 4 cores on 32bit.

Either of you have a reference for that?  It sounds like a BS answer made up by ATI developers who didn't want to try harder.  There is no hardware limitation outside of the number of physical available ports.  A software limitation I could see, as they'd possibly run out of address space in the 32bit drivers when looking at more than 32GB of VRAM Cheesy

Its a hardcoded driver issue on both ati and nvidia.  The 32bit was for obvious reasons, the 64bit seems less clear why.
The 32bit claim is false. I eventually got 5 GPUs working on 32-bit 11.04 Ubuntu Linux, without any hacking of the ATI drivers or APP SDK.

Unless the claim references the hardware, which it doesn't seem to. My example *was* a 64-bit CPU but I was running 32-bit Linux. And all 5 GPUs worked. The only aggro was that I needed a full x16-x16 extender in one of the slots - the other four GPUs ran x1-x16 extenders. Took a lot of experimentation to get it working.

I was under the impression that the Linux drivers supported up to 8 GPUs - regardless of bitness. I only run 4 GPUs per logic board now for modular / cost / standardisation reasons, and have upgraded the base Linux install to a lighter but 64-bit distro. But I wasn't hallucinating, there's a thread about it somewhere...

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November 10, 2011, 03:44:35 PM
 #29

The 32bit claim is false. I eventually got 5 GPUs working on 32-bit 11.04 Ubuntu Linux, without any hacking of the ATI drivers or APP SDK.

That's correct, didn't catch that before.  Both the 32bit and 64bit drivers should support at least 8 GPUs currently.

The driver's interface with the OS layer may use 32bit or 64bit addressing depending on the OS, but the binary bits of the driver are likely identical otherwise.  The newer Radeon HDs actually use a 256bit address space to address it's own memory, internally - the exchange with the OS is all serial communication (PCI is serial), so addressing the GPU components from the OS level is just about sending the right hardware address + commands.  

It could easily be a 16bit OS and address an infinite number of GPUs, as long as the driver handles interfacing that with the OS properly.

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November 10, 2011, 05:33:24 PM
 #30

The 32bit claim is false. I eventually got 5 GPUs working on 32-bit 11.04 Ubuntu Linux, without any hacking of the ATI drivers or APP SDK.

That's correct, didn't catch that before.  Both the 32bit and 64bit drivers should support at least 8 GPUs currently.

The driver's interface with the OS layer may use 32bit or 64bit addressing depending on the OS, but the binary bits of the driver are likely identical otherwise.  The newer Radeon HDs actually use a 256bit address space to address it's own memory, internally - the exchange with the OS is all serial communication (PCI is serial), so addressing the GPU components from the OS level is just about sending the right hardware address + commands.  

It could easily be a 16bit OS and address an infinite number of GPUs, as long as the driver handles interfacing that with the OS properly.

Awesome.  Diablo3d was the one that gave me my info, but I could have understood it wrong.  Good to know.

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