I have been running two GTX 460s in non-SLI since I obtained them and I noticed that the TPF and PPD were considerably low (7000-9000 PPD) compared to the entries found here. I thought that the automatic downclocking of the cards was the problem (which I resolved in this thread), but fixing that problem did not fix the bigger problem of poor performance. I was tempted to post on this forum asking for help, but I wanted to try something first.
For some reason, I thought that having the two cards folding at the same time was causing the poor performance. Sure enough, that's what it was. I removed one of the GTX 460s and, coincidentally, the TPF was split (exactly, I believe) in half. The single GTX 460 is running happily at 17000 PPD.
Now why does running two identical GTX 460s cause each 460 to lose half of its performance? Is this a driver problem? I switched to a previous driver trying to figure this poor performance out and that didn't fix it. I know people fold with multiple identical cards together, so I assume that it's not a software bug, but rather a misconfiguration on my end. Now the question is: what is wrong with my setup?
I am running SMP:6 and trying to run two GTX 460s in non-SLI, and I also have a third card that doesn't fold running two monitors. One 460 has one monitor plugged in and the other 460 does not. Previous driver version was 314.xx and currently is 306.23. The 460s' GPU clocks are 781 MHz core, 900 MHz memory, and 1560 MHz shader. The "System" section of the log is below.
Code: Select all
03:22:20:************************* Folding@home Client *************************
03:22:20: Website: http://folding.stanford.edu/
03:22:20: Copyright: (c) 2009-2013 Stanford University
03:22:20: Author: Joseph Coffland <joseph@cauldrondevelopment.com>
03:22:20: Args: --open-web-control
03:22:20: Config: C:/Users/Patrick/AppData/Roaming/FAHClient/config.xml
03:22:20:******************************** Build ********************************
03:22:20: Version: 7.3.6
03:22:20: Date: Feb 18 2013
03:22:20: Time: 15:25:17
03:22:20: SVN Rev: 3923
03:22:20: Branch: fah/trunk/client
03:22:20: Compiler: Intel(R) C++ MSVC 1500 mode 1200
03:22:20: Options: /TP /nologo /EHa /Qdiag-disable:4297,4103,1786,279 /Ox -arch:SSE
03:22:20: /QaxSSE2,SSE3,SSSE3,SSE4.1,SSE4.2 /Qopenmp /Qrestrict /MT /Qmkl
03:22:20: Platform: win32 XP
03:22:20: Bits: 32
03:22:20: Mode: Release
03:22:20:******************************* System ********************************
03:22:20: CPU: AMD FX(tm)-8120 Eight-Core Processor
03:22:20: CPU ID: AuthenticAMD Family 21 Model 1 Stepping 2
03:22:20: CPUs: 8
03:22:20: Memory: 3.98GiB
03:22:20: Free Memory: 2.94GiB
03:22:20: Threads: WINDOWS_THREADS
03:22:20: Has Battery: false
03:22:20: On Battery: false
03:22:20: UTC offset: -4
03:22:20: PID: 4856
03:22:20: CWD: C:/Users/Patrick/AppData/Roaming/FAHClient
03:22:20: OS: Windows 8 Pro
03:22:20: OS Arch: AMD64
03:22:20: GPUs: 2
03:22:20: GPU 0: NVIDIA:2 GF104 [GeForce GTX 460]
03:22:20: GPU 1: UNSUPPORTED: G84 [GeForce 8400 GS]
03:22:20: CUDA: 2.1
03:22:20: CUDA Driver: 5000
03:22:20:Win32 Service: false
03:22:20:***********************************************************************
Any help would be greatly appreciated