Pemalite said:
disolitude said:
Those PCIe 2.0 vs 3.0 benchmarks apply to current gen cards (HD7000 and gtx600 and prior) I am fairly certain that someone with Z67 board and sandy bridge would be running in to bottlenecks with a dual Titan sli running pcie 2.0 8x8x. 3-4 years down the road when a single card can offer dual titan performance, pcie 2.0 may no be enough. Also since steamroller is using AM3+, there is no reason why he cant upgrade to that in a year or two...
If money was of no concern, Id definetly say go for fx 8320 (not 8350) and a beefy water AIO cooler and get it to 4.8 Ghz...but in a build hes putting together, I dont think its worth 50 bucks more.
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Oh god. I've ran tests with my Triple Radeon 7970's with PCI-E 2.0 against 3.0, there was no difference outside of compute. None, nada, nil, with the rate GPU's are advancing these days, it will be a long time before PCI-E 2.0 ever becomes a limiting factor, by then it would be time to overhaul the machine anyway.
People still drop high-end cards into Socket 775 (PCI-E 1.0 16x = PCI-E 3.0 4x) motherboards without a problem or massive performance impact.
PCI-E 2.0 16x = PCI-E 3.0 8x in terms of bandwidth.
Also, don't hedge your bets on Steamroller, it hasn't been confirmed to be coming to AM3+, AMD may release a new socket, A-la. AM4 possibly requiring a new Motherboard.
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Here is a vid showcasing limits of PCIe 2.0 vs 3.0...CallsignVega has some awesome videos and ing eneral knows his shit.
http://www.youtube.com/watch?v=S0-xcxAvu54
I know the 3.0 is just 2.0 X 2 in terms of speed but if you throw enough GPU horsepower at it, you will see bottlenecks at some very high FPS rates, depending on the amount of PCIe lanes you have available. The board he is getting is X16, X4 for example...
Sure it took Quad GTX 680 to hit this limit on an X79 chipset but this mobo is x16, x8 ,x8, x8 in quad sli with 40 total lanes. Some AMD boards are PCIe 2.0 x16 lanes total and x8,x8 in SLI/crossfire you may run in to a bottleneck as well. This bottleneck may happen at 100+ fps and AMD cpu may already bottleneck the rig before that happens. However for something like 3D vision where its all GPU and not CPU, it will be evident even at lower frame rates.
As far as Steamroller, you may be right... I am going simply on what has been reported on thus far.
http://www.theinquirer.net/inquirer/news/2208525/amd-sticks-with-socket-am3-for-steamroller
