x8 secondary PCI-E slot = x16 x8 or x8 x8 SLI config? Tags: SLI Graphics Crossfire Configuration PCI Express Last response: August 15, 2013 8:25 PM in Graphics & Displays Share SinanDira August 15, 2013 11:36:01 AM When does a secondary x8 slot mean that both cards will work at x8 and when does it mean that they'll work in a x16 x8 config? Also, which is better, 2.0 x16 x4 or 2.0 x8 x8? More about : secondary pci slot x16 sli config clutchc August 15, 2013 8:25:25 PM To answer your first question, I would have to know the motherboard in question to see exactly how the specs are phrased. The second question is easy. X8, x8 is much better than x16, x4. The latter will drag down the speed of the card in the x16 slot. I know. I've tried it. Can't find your answer ? Ask ! Publish Related resources PCIe 3.0 x8 card in PCIe 2.0 x16 slot: will it run in PCIe 2.0 x8 or x16 mode? Forum x8 pcie card in a x16 pcie slot ? Forum SolvedPCIe x16 card running at only x8 (non SLI) Forum 7950 pcie slot running at x8 instead of x16 Forum GPU not operating in PCIe x8 slot, works in x16 Forum Pci-e x16 card in a x8 slot? Forum Does a Dual GPU run at x8 or x16 When Inserted In PCI-E Black Slot? Forum PCI-E runs x8 in x16 slot Forum PCI-E x16 slot only running at x8 Forum PCIe Bandwidth issues.. Showing x8 width on a single x16 slot Forum Motherboard PCIe x16 Slot stuck on x8? Forum SolvedPCI-E slots and x16, x8 Forum PCIE x16 slot running at x8 why? Forum Pcie x16 slot split over 2 x8 slots performance Forum Whats faster... SLi: (TWO) BFG 8800 Ultra Over Clocks (PCI-e x16) or SLi: (TWO) THE FASTEST PCI-e x16 2.0 (@ x8 bandwidth) Forum SolvedGeForce 275 SLI using PCIe x8 (and not x16) Forum PCIe x16 and x8 and SLI. Forum Will pci-e 2.0 @2 times x16 lane cf/sli be faster than x8 mode 2.0 Forum SolvedGTX760's SLI in PCI-e2.0 x8 slots - Saturation? Forum Why are PCI-E slots not configured correctly (X58 board x16 at x8) Forum 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 !