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so i have the nvidia 780i chipset in my motherboard which, as you know, is tri-sli ready. I have 1 8800GTS 512mb card in there presently and am thinking about adding another or upgrading to the GTX260(making up my mind in that area is another thread, altogether). Now, supposing i add another 8800GTS for SLI, i will still have 1 pci-e 16x slot left. is it possible to throw another card, say a 9600GT or another sub-$100 card in there just as a folder?? other than HEAT, what kind of problems am i looking at if doing that?? and with the SLI cards, will i be able to just turn off SLI when i'm not gaming so that I can fold on each card?

EDIT: okay, after more research it looks as if i need to build a VGA Dummy Connector? anyone get this to work without using one of those? my soldering skills are up to par but it just seems like a lot of trouble getting my hands on those parts. anyway...if anyone has any ideas, please let me know. i really appreciate it

David00214 used two connections (DVI & VGA) to the same monitor to extend his desktop.

I also had success using the NVidia Control Panel to switch to muiltiple GPUs without using a second monitor hook up.

You have to turn SLI off prior to enabling multiple GPUs.

If you run XP you don't have to play around with anything.

I've got a 9800 GTX 512 in one PCI slot, and a 9800GX2 in the other powered by a 750W Power supply. This nets ~5000PPD x3 = 15000PPD.

Heat and noise is an issue. And my Nvidia boards have a high pitched squeal which is annoying.

- JP

My 9800GX2 still is at only 2,000 PPD on the second GPU. I am running multiple GPU setting, the desktop is extended, I have two GPU2 clients with different machine IDs and have "-forcegpu nvidia_g80 -gpu 1" and "-forcegpu nvidia_g80 -gpu 0" set in the additional parameters. What else do I need to do to get both GPUs folding properly?

Try downloading GPUZ and see if there is a difference in how the GPU's are running.

http://www.techpowerup.com/downloads/11 ... 0.2.6.html

Also, take a look at the CPU affinities on the FahCore_11.exe processes.

- JP

Only difference I see is in the BIOs version. Is that normal?



To the OP, sorry if I am hijacking your thread let me know and I will cease and desist. Figured this is useful for anyone trying to get two GPUs working though.

My GX2 shows the same thing with the BIOS version, so that's not your problem.

You are running Vista so I can't help you out much. I'd check the CPU usage% and make sure your feeding the GPU enough CPU. Or try a regression of Nvidia drivers. I'm running 177.84 under XP without any issues on either system.

david00214 wrote:

To the OP, sorry if I am hijacking your thread let me know and I will cease and desist. Figured this is useful for anyone trying to get two GPUs working though.

no worries man. this can be a thread for anyone working on getting multiple GPUs up and folding on their machine. what helps one is sure to help another...

Are each GPU2's threads limited to a single core or are they loose using which ever CPU is free? You can stack both GPU2's so they both share that 20% CPU polling or whatever under Vista.