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PCIE lanes SLI question

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  • Gigabyte
  • Motherboards
Last response: in Motherboards
May 25, 2011 8:41:37 AM

Hi all.

I am putting together a new system and i have already bought most of the components. however i have a question about how PCIE lanes work when you have multiple cards, or more specifically:

i have 2 Asus Direct CUII 580GTX's and one XFX 9800GTX+ that i want to SLI, using the 9800 as a dedicated physx card. on the GA-P67A-UD7-B3 motherboard which i am most likely buying (i have seen that a lot of people have said things on here about it, and the big sticky on gigabyte boards but i like them and they have never caused me any issue, my last 3 have always performed fine) and in the specs of the board it lists the PCIE lanes working as:

2 x PCI Express x16 slots, running at x16 (PCIEX16_1, PCIEX16_2)
* 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.
2 x PCI Express x16 slots, running at x8 (PCIEX8_1, PCIEX8_2)
* The PCIEX8_1 slot shares bandwidth with the PCIEX16_1 slot and the PCIEX8_2 slot with PCIEX16_2. The PCIEX16_1/PCIEX16_2 slot will operate at up to x8 mode when the PCIEX8_1/PCIEX8_2 is populated.
1 x PCI Express x1 slot
(All PCI Express slots conform to PCI Express 2.0 standard.)
2 x PCI slots

(taken straight from their specsheet)

is it possible to connect these cards so that the 2 gtx580 will have 16x bandwidth and that the 9800 only runs at 8x? or something similar so that at least the main card will run in a 16x lane.

the rest of the components (for anyone who's interested are:
Intel 2600K
GA-P67A-UD7-B3
12GB corsair dominator GT CMT12GX3M3A2000C9
2 x WD 600GB sata3 raptors in raid 0
2 x 1TB seagate HDD sata2
1 x 1.5TB WD green 7200
Pioneer BD burner
Asus DVD burner
Level 10 GT
thermaltake grande 1200w
zalman cnps9900MAX cooler

bonus question for extra credit (yes i do want an answer :D ): is it worth getting 24GB of ram instead of sticking with just 12GB?

thanks guys.

EDIT: i should note that i'm running windows 7 64 bit (or that ram would be pointless :D )

More about : pcie lanes sli question

Best solution

a c 1527 V Motherboard
May 25, 2011 9:16:38 AM

Start answering the ram question, your board supports dual channel so using an even number of modules is best 2x4GB is plenty for gaming. Triple channel kits are designed for LGA1366 systems.
According to this the 2 x PCIeX8 slots share bandwith with the X16 slots so you only have an option of either X16 X16 SLI without the PhysX card. http://www.gigabyte.us/products/product-page.aspx?pid=3...
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May 25, 2011 12:00:16 PM

rolli59 said:
Start answering the ram question, your board supports dual channel so using an even number of modules is best 2x4GB is plenty for gaming. Triple channel kits are designed for LGA1366 systems.
According to this the 2 x PCIeX8 slots share bandwith with the X16 slots so you only have an option of either X16 X16 SLI without the PhysX card. http://www.gigabyte.us/products/product-page.aspx?pid=3...


so the board does... didn't even notice it was only dual channel :\

and ok, that makes sense now that it's been pointed out.

guess i'll wait for the X79chipset to come out then, and reap the benefits it brings.

thanks rolli59
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May 25, 2011 12:00:25 PM

Best answer selected by Commander Bubble.
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