Problems with 3 GPUs

[superness]

Would have loved to drop this in a more appropriate forum.. but here we go

I've been mining over the past week with 2x7950s, and while I was doing that I ordered two more 7950s.

Here's the problem: After adding a third 7950 to the system my computer boots and runs incredibly slow. ( Boot times went from ~15s to multiple minutes )
Now, I seem to be able to mine just fine once it finally starts up but it's mostly unusable.

Any one experience anything like that? Any suggestions?

My PCI-E slots are 16x16x1, my PSU is 1300w, the CPU is beefy, there is 6gb of ram in the system.

[Joshster]

Maybe you are experiencing some sort of bottle necking to your system and causing it to lag during boot up.

[superness]

The machine also runs slow while it's on, not just boot.

And I'll say that I have tried every combination of two of the three cards and it runs great, while adding a third card runs very poorly.

[Joshster]

Must be a issue with the motherboard not being able to handle the 3 GPU's well, what motherboard are you using n your rig.

[pendula032]

Try to flash the latest bios for mb

[superness]

Mb is Asus P6T deluxe. I'll try flashing it thanks.

[warsnoopy]

Well assuming this is purely a mining rig, your cheap processor and RAM shouldnt be the problem.

[superness]

Flashing the BIOS seems to have fixed it!

If anyone else has an ASUS P6T mobo and has this issue, save yourself time/headache and flash your bios!

[ZeikHunter]

I've got this same problem, but my topic got deleted.

mined with a 5970 for a few weeks, remembered I had a 5850! added that in the mix, now no matter what options I specify, cgminer stops @ "Started cgminer 2.11.4". Ends up chewing all my ram until I BSOD

1kw psu, amd 6-core proc, 16gb ram, on win7 64