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PCI-E 3.0 x8, x8, x8 vs PCI-E 2.0 x16, x8, x8?

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  • Graphics Cards
  • Motherboards
Last response: in Graphics Cards
June 13, 2013 2:01:44 PM

Folks, I upgraded my mobo and just realized the PCI-E changes.

My old mobo had three GTX 670 4gb in Tri-SLI @ x16,x18,x8 @ PCI-E 2.0

My new mobo will have the same but at x8, x8, x8 PCI-E 3.0

Did I just lose a lot of bandwidth?

These cards are powering a triple 27" monitor setup at 3420x1920.

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a c 198 V Motherboard
a c 196 U Graphics card
June 13, 2013 2:10:55 PM

No. Each generation of PCIe doubles the bandwidth.
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June 13, 2013 2:15:16 PM

You actually gained bandwidth. PCI-E 3.0 has double the bandwidth as PCI-E 2.0. So at x8 with PCI-E 3.0 you are the same as x16 PCI-E 2.0. Your 3rd card is actually on a faster slot now because x8 3.0 is the same as x16 2.0.
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a b V Motherboard
a b U Graphics card
June 13, 2013 2:15:24 PM

No. To give you a reference on how generations of PCI-E are, an 8x PCI 3.0 is the equivalent to a 16x PCI 2.0. A 4x PCI 3.0 is equivalent to an 8x PCI 2.0, so on and so forth. So no, you did not lose any bandwidth, you actually gained a substantial amount.
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June 13, 2013 2:20:53 PM

Thanks, guys. I was a little concerned. Didn't want to upgrade to the 2011 chipset just for PCI-E lanes. So just got the ASROCK Extreme 11 Z77 (from the Z68).
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