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GTX 560 SLI and a GT 430 dilemma..

post #1 of 5
Thread Starter 
Hello, I'm throwing together a rig and I was wondering if these parts are balanced.
I'm going to purchase an ASUS P8P67 Deluxe (Once they start shipping them)
Now on this motherboard there are 3 PCI-Ex16 slots with the bandwiths of x16, x8 and x4.
Can I place two GTX 560's in the x16 and the second one in x8, while my PhysX card (The GT430) would be placed in the slot with the bandwith of x4, will this all run efficiently? I also heard that while a third card occupies the third slot, it will decrease efficiency by 20%, is this true even if the x16_4 slot will be occupied by the GT 430 solely for PhysX?
Now onto the next question, will the Corsair HX850 PSU suffice to power all of these cards and a 2500K CPU?
(Here it is: http://www.newegg.com/Product/Produc...82E16817139011)

Phew, thanks a lot for reading
post #2 of 5
if i'm correct you will have the two gtx 560s running at x8 in sli and your physx card in x4. it's fine as the difference between x8 and x16 is a very small percentage. if it makes you feel better though, then get a motherboard that carries two x16 lanes.
Alucard
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Alucard
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post #3 of 5
The PSU should be fine, although the 430 is a little weak for that setup imo, and might actually bog you down. A 9800GTX/GTS 250 would do better as far as budget cards are concerned.
post #4 of 5
Thread Starter 
Alright thanks, so the x4 PhysX will not slow down the x8/x8 SLI by 20%? (Or more O.o).
post #5 of 5
Everything I have read about the Asus P8P67 pro and deluxe motherboards (including my P8P67 deluxe user manual) have said that there is no combination of cards that can make your PCIe x16 1 and 2 run at anything less than x8 and x8 and that should be more than adequate for 560 sli. What I have seen is that according to newegg the Asus P8P67 pro "The PCIe x16_3 slot shares bandwidth with PCIe x1_1 slot, PCIe x1_2 slot, USB3_34 and ESATA12. The PCIe x16_3 runs at x1 mode by default for system resource optimization.(PCIe x1_2 will be disabled.)" so if you had planed to use those then your PCIe for the Physx card would either be limited to x1 or you would have to switch it to x4 in the efi bios and lose the use of those PCIe x1 and usb 3 and eSATA. I have not seen this mentioned anywhere about the deluxe (neither in my manual, the efi bios, newegg, nor anywhere else) so you should have everything running at x8 x8 and x4 with everything else still available with the deluxe. Keep in mind that you will need your Physx card in the last slot to either be single slot or you need to have a case that can accommodate 8 pci slots.

EDIT: This link shows that the Asus P8P67 standard has a similar setting to the pro to change bandwidth of a PCIe x4 from x1 to x4 and its under the onboard devices page in the efi bios which leads me to believe that's where the similar setting would be for the pro and I just double checked the efi bios on my deluxe and I can confirm that there is no setting to change the bandwidth of any PCIe slots so it will run at x8 x8 x4 just like you want and would be a great setup for 560 sli with a Physx card. That 850 watt corsair should be plenty for such a setup as well.
Edited by juano - 3/7/11 at 8:38pm
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Main Rig
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