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5770 Xfire x16/x4 PCIe

post #1 of 2
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Bringing this over from another area, is there truly a big difference in running Xfire with 1xPCIe2.0x16 and 1xPCIex2.0x4? I found a couple reviews that state that the 2.0 x4 lane is perfectly fine for most cards...
http://www.techpowerup.com/reviews/AMD/HD_5870_PCI-Express_Scaling/1.html
http://www.hardocp.com/article/2010/08/25/gtx_480_sli_pcie_bandwidth_perf_x16x16_vs_x4x4
I only ask because I wanted to do dual 5770's on a board that only supports 1-x16 and 1-x4...I understand that 2 full x16 lanes is optimal, but it sounds like with the 2.0 lanes 16x is really overkill for performance.
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Blue Fury
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AMD A8 6600k asus Sapphire 290X Tri-OCX 4GB 2x4 (8)GB G-Skill Ripjaws 1600 
Hard DriveHard DriveHard DriveHard Drive
OCZVertex3 60GB Seagate 1TB WD 500GB Samsung 
Hard DriveOptical DriveCoolingOS
Samsung Evo 850 ASUS DVDRW24x Corsair H100 W10 
MonitorKeyboardPowerCase
55" 4k Hisense Razer Blackwidow Ultimate 2013 Corsair CX750 AzzA Hurrican 
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Razer Deathadder 3500 Diablo3 RoS LE onboard 
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post #2 of 2
x4 is a negative, Ghost Rider, the pattern is full.

You're losing 20% off the bat... ideally you'd want at least x8, but if it's all you got it's all you've got so not much ado about nothing I suppose?
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