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These big new cards and how they relate to PCI-E lanes!

post #1 of 2
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Long story short I haven't upgraded my system in roughly 4-5 years and want to make a complete overhaul with all this new hardware coming out! Even if some of it is proving to not be as impressive as I had hoped *cough Haswell*.

Anyways I want to do a SLI setup in the future. And everything that I read regarding PCI-E bandwidth related to x16/x16 lanes and x8/x8 lanes seems to state that with 3.0 x16 (essentially 2.0 x32?) is waaaaaaay out of current tech's reach to fully utilize. However, all the sources on this I read are often using very mid-tier 600 series cards or high end 500 series.

Say I wanted to SLI 780's today (I really intend to wait for Maxwell to SLI however), will the 780's be perfectly fine running on the x8/x8 lanes? Would I notice a difference if it was x16/x16 or would it be a measly potential 1-2 frame difference which seems to be the case with the tests I saw of older cards.
post #2 of 2
It really depends on your screens resolution. A 1920x1080p monitor would not see the benefit of higher speed lanes. Vega did a thorough comparison and analysis of lane speed versus performance on one of his beastly setups. I'll see if I can dig that one up.
But in order to see a profit from high speed lanes, you'd need a very high resolution monitor (4K is the future) or a multi-monitor setup at 5760x1080 or higher.

I'll go dig for Vega's charts and graphs.

Edit:
I couldn't find the post I was referring to, but an entire thread was made to discuss what you're asking thumb.gif
Vega's SLI Scaling Thread. Be sure to give the man credit if it helps you.
Edited by Agoriaz - 6/2/13 at 11:58am
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ASRock E3G3
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K ASRock Extreme3 Gen3 ASUS Radeon R9 290X DirectCU II Corsair Vengeance 2x4gb 
Hard DriveHard DriveHard DriveHard Drive
Crucial M4 Western Digital Caviar Blue Western Digital Caviar Green Western Digital Caviar Blue 
Optical DriveCoolingOSMonitor
Samsung S222 CoolerMaster 212 EVO Windows 10 64bit Crossover 27q 
KeyboardPowerCaseMouse
Lenovo OEM Corsair TX650 Fractal Define R3 Medion Erazer 
Mouse PadOther
Trust High Precision Gelpad Logitech X-230 
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