Solved Will an x4 pci-e slot bottleneck a video card? Tags: Radeon Graphics Cards Bottleneck PCI Express Graphics Last response: October 26, 2011 1:51 AM in Graphics & Displays Share toepickles October 26, 2011 12:02:36 AM hi guys i have crossfired 2 6770's but unfortunetly im seeing less performance. Could this be caused by the x4 slot? More about : pci slot bottleneck video card Best solution rolli59 a c 1255 U Graphics card October 26, 2011 12:18:42 AM It is a settings issue, although x4 supports CF it is not recommended it should though increase performance not decrease it. toepickles October 26, 2011 1:26:48 AM thanks man ill look into the settings a bit Related resources PCI-E x4 slot and video card - Forum Video card PCI-E 16x in a PCI-E 4x slot ???? - Forum What does PCI Express 2.0 16x slot (@ x4 ) mean? - Forum Is my card reaching a bottleneck with PCI-e x4 ? - Forum FASTEST CARD FOR PCI-E X4 - Forum Can't find your answer ? Ask ! Get the answer rolli59 a c 1255 U Graphics card October 26, 2011 1:31:18 AM If you just installed the second card did you reinstall the drivers? toepickles October 26, 2011 1:49:18 AM ok my psu wasnt giving power to the second card for some weird reason so i switched the power to a 6 pin to molex adapter and it seems to be working fine now. Thanks for the quick response (PS. I have a 750w PSU so not enough power isnt the problem) toepickles October 26, 2011 1:50:24 AM rolli59 said:If you just installed the second card did you reinstall the drivers? yes i did. again thanks for the reply! toepickles October 26, 2011 1:51:51 AM Best answer selected by toepickles. Can't find your answer ? Ask ! Publish Related resources : ForumASUS Sabertooth z77 - One PCI-e slot not recognizing video card , RMA? ForumPCI-e 2.0 vs PCI-e x4 slot ForumGPU at PCIE 2.0 x16 Slot running at x4 ! ForumWill a PCI-E 2.0 video card work in PCI-E 1.0 slot ? ForumWill a Phenom x4 955 Bottleneck Two 7870s ForumCan i plug a pcie 2.1 video card into a 2.0 slot ? ForumMSI Big Bang XPower PCIe slot question ForumWill a pcie v2.1 video card work in a v1.1 slot ? ForumNeed Video card for PCI-E X8 slot with Directx 9 support Forum5760x1080 Eyefinity on HD 7870 ForumWhat new graphics card should I get? ForumVideo playback issues ForumWill my ATI Mobility Radeon 5650 HD run Battlefield 3? Forum[Solved] ASUS 6950 for Gaming/Video/Graphic Editing ForumCheap interim graphics card More resources Read discussions in other Graphics & Displays categories Ati GPUs Graphics Cards Gtx HD Monitors SLI Crossfire Tuner Cards Radeon Video Diamond Multimedia Matrox Nvidia Palit PowerColor Asus Games !