Sign in with
Sign up | Sign in
Your question
Solved

Dual GTX 660 on PCIe 2.0 8x, worth it?

Last response: in Graphics & Displays
Share
April 12, 2013 4:59:04 PM

Hello everyone, I currently have a single GTX 660 SC and was interested in adding another. I have the M5a99X evo r2.0 mobo and it has PCIe 2.0 x16. If i were to add another card the PCI slots would be running at 8x each. Would that bottleneck my performance?
April 12, 2013 5:10:17 PM

Chritty said:
Hello everyone, I currently have a single GTX 660 SC and was interested in adding another. I have the M5a99X evo r2.0 mobo and it has PCIe 2.0 x16. If i were to add another card the PCI slots would be running at 8x each. Would that bottleneck my performance?


The PCI x8 lane is definitely going to slow down the performance. I would recommend selling your current GPU and getting into a single card like a 7970 or 7950.
m
0
l
April 12, 2013 5:18:57 PM

The short answer is no, or not noticeably. There have been many tests done against PCIEx and using an 8x slot only hampers the fastest of cards.

While the 660 is technically capable of around 75GT's and a PCIE 2.0 8X slot maxes out at 40GT's, the real world performance impact is hardly noticable.
m
0
l
Related resources

Best solution

April 12, 2013 5:33:48 PM

Not even in the slightest would you notice the difference. I plugged my gtx titan into a 8x pci-e 2.0 lane and ran valley benchmark. The difference was 0.5 fps not even enough to warrant recording. So if a gtx titan isn't bottlenecked then I'd say you will be fine with gtx 660's
Share
April 12, 2013 5:38:05 PM

Thanks for the quick replies guys I really appreciate it.
m
0
l
April 12, 2013 5:40:08 PM

try to run 2 of those cards and you will be cpu bound. and depending on the game/settings/resolution/cpu you may not be far from it now.
m
0
l
April 12, 2013 5:44:00 PM

Yea does sort of depend on the cpu but as for the pci-e lanes those won't be the bottleneck for sure.
m
0
l
!