Forum > GPU crunching
GTX 460 superclocked
Frizz:
I am planning to build a system with :
1x GT 240
1x GTX 460
How do I have to modify my app_info.xml to run those two cards with x32f?
The GTX 460 can run more than one task in parallel, right? Was it 3? How do I have to configure this?
Jason G:
--- Quote from: Frizz23 on 10 Aug 2010, 11:46:57 am ---I am planning to build a system with :
1x GT 240
1x GTX 460
How do I have to modify my app_info.xml to run those two cards with x32f?
The GTX 460 can run more than one task in parallel, right? Was it 3? How do I have to configure this?
--- End quote ---
OK, firstly, if you are going to mix those cards (Fermi & pre fermi) there is an issue with the 3.1 Cuda runtime (nVidia bug in the CUFFT library) ... The solution is to use the Cuda 3.0 build of x32f instead.
For installation, I would use the Lunatics Installer first, BUT not start Boinc yet ... Then follow the same procedure as I gave perryjay below, but modify the app info to suti the Cuda 3.0 executable names & DLLs.
There is a complication if you plan to use a 64 bit OS. You'll need a different, more complicated aistub. I'll provide that if the situation arises.
Also bear in mind that no programming information has been released on the GTX 460 yet, either publicly or to registered developers under NDA, so there *may be* significant differences that will require some re-engineering of key code kernels to see what they are really capable of.
Cheers, Jason
Frizz:
Thanks Jason,
--- Quote from: Jason G on 10 Aug 2010, 12:57:24 pm ---For installation, I would use the Lunatics Installer first, BUT not start Boinc yet ... Then follow the same procedure as I gave perryjay below, but modify the app info to suti the Cuda 3.0 executable names & DLLs.
--- End quote ---
(1) As far as I understood the GF10x GPUs can run more than one WU at a time, no? How do I have to configure this in app_info.xml?
(2) I was thinking about getting the 768MB version (slightly less power consumption) - but if they run more than one WU at a time I might run out of memory when I crunch 3 at a time. No?
Ghost0210:
Hi Frizz23,
Stop Boinc. Then in your app_info.xml there will be a segment like this
--- Quote ---<app_version>
.....
<type>CUDA</type>
<count>1</count>
</coproc>
.....
</app_info>
--- End quote ---
Change the <count>1</count> to either <count>0.5</count> or <count>0.33</count> if you either want 1,2 or three tasks to run on the fermi card
Restart Boinc and you should have multiple tasks running on the same card :D
As far as I know the Fermi build takes about 300MB per task - so you should be able to run 2 tasks. Sure Jason will correct me if I'm wrong on this ;D On my 465 I get the best through put with two tasks running at a time (994MB)
Bit later: I've attached my app_info for reference (cuda 3.1 build make sure to change if you use the 3.0 build also remembered the plan class is different(fermi31) so this will need changing as well)
Frizz:
Thanks Ghost,
--- Quote from: Ghost on 10 Aug 2010, 02:52:19 pm ---As far as I know the Fermi build takes about 300MB per task - so you should be able to run 2 tasks. Sure Jason will correct me if I'm wrong on this ;D On my 465 I get the best through put with two tasks running at a time (994MB)
--- End quote ---
How come 2 x 300MB = 994MB? ;-)
Hmmm ... that would mean the 765MB version would be OK for me (they consume about 10 watt less and are approx. 40 EUR cheaper).
How long does an average WU take to crunch on your GTX 465?
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