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sli and x58 x16 or x8?

post #1 of 8
Thread Starter 
I want to run my cards on my 1st and 4th slot of my motherboard. I'm 100% sure the first slot is pci express x 16 lane, but what about my 4th lane?

Would the cards run at x16 if they are sli'd like this?
Currently I have it in the first and third slot aka they are sandwiched and they get too hot.. up to 80c sometimes if I don't use the side panel fan.

my motherboard is a gigabyte UD3r rev2
post #2 of 8
Basically
Quote:

For optimum performance, if only one PCI Express graphics card is to be installed, be sure to install it in the PCIEX16_1 slot; if you are installing two PCI Express graphics cards, it is recommended that you install them in the PCIEX16_1 and PCIEX16_2 slots.

The PCIEX8_1 and PCIEX8_2 slots share bandwidth with the PCIEX16_1 and PCIEX16_2 slots respectively. When PCIEX8_1 is populated with an expansion card, the PCIEX16_1 slot will operate at up to x8 mode; when PCIEX8_2 is populated with an expansion card, the PC IEX16_2 slot will operate at up to x8 mode.
With this explanation in mind, I think it's

Slot 1- 16x
Slot 2- 8x
Slot 3- 16x
Slot 4- 8x

So ye it's 8x.
Edited by Xenthos - 11/4/11 at 1:52am
post #3 of 8
Look in your mobo manual it will tell you what speed your PCI-E slots are.

2 x PCI Express x16 slots, running at x16 (PCIEX16_1/PCIEX16_2) (Note 1)
2 x PCI Express x16 slot, running at x8 (PCIEX8_1/PCIEX8_2) (Note 2)

(Note 1) For optimum performance, if only one PCI Express graphics card is to be installed, be sure to install it in the PCIEX16_1 slot; if you are installing two PCI Express graphics cards, it is recommended that you install them in the PCIEX16_1 and PCIEX16_2 slots.

(Note 2) The PCIEX8_1 and PCIEX8_2 slots share bandwidth with the PCIEX16_1 and PCIEX16_2 slots espectively. When PCIEX8_1 is populated with an expansion card, the PCIEX16_1 slot will operate at up to x8 mode; when PCIEX8_2 is populated with an expansion card, the PC IEX16_2 slot will operate at up to x8 mode.

From the manual.

8X isnt the end of the world unless you have a huge res like triple screens.
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post #4 of 8
Thread Starter 
Is a slight performance loss worth it for much cooler temperatures?
post #5 of 8
Your 3rd and 4th pcie slots are x8. There is very little performance loss. I have my 470s in slot 1 and 3 (SLI). They run GREAT!

So, "yes" I think it's worth it for better temps.
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post #6 of 8
It's not like it's hard to try it out and see what the benefits and drawbacks are ... takes 5 minutes to move a card down a slot. Shouldn't even have to re-install drivers, it should happen automatically. Although you may have to re-enable SLI afterwards.

I would just run some benchmarks (3dmark11 and Heaven are good, and free) before/after the change. That way you can see if you lose any FPS from the change, and how much the temps drop.

BTW, is your SLI bridge long enough?
Edited by brettjv - 11/4/11 at 9:42am
    
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post #7 of 8

IIRC the difference between full 16x SLI and 8x SLI is less than 0.5%

post #8 of 8
x16 to x8 in terms of performance loss is virtually non existant, even synthetic benchmarks show next to nothing in it. Don't worry yourself over such things mate.

It only tends to show itself on surround resolutions pushing TRI SLI or Quad SLI, and even then it's such a small loss it's not worth concerning yourself over. We are a long way from saturating the PCI-E 2.0 standard.
 
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