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PCIe 3.0 AM3/AM3+

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khan.sikki View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote khan.sikki Quote  Post ReplyReply Direct Link To This Post Topic: PCIe 3.0 AM3/AM3+
    Posted: 31 Oct 2015 at 11:37pm
Hello Friends,

Why there was no mother board designed for AM3 / AM3+ with pcie 3.0, up to my knowledge only ASUS have this achivement 

SABERTOOTH 990FX/GEN3 R2.0

Sikander
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ASRock Expert Quote  Post ReplyReply Direct Link To This Post Posted: 01 Nov 2015 at 12:10am
The PCI-e Gen3 is based on the CPU,
so, until AM4, no PCI-e Gen3 for AMD users.

Sabertooth is just a fake advertisement.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Xaltar Quote  Post ReplyReply Direct Link To This Post Posted: 01 Nov 2015 at 1:02am
It is a pretty heated topic on some forums, the ASUS board you mentioned claims PCIe 3.0 support yet many say it is only emulated not true PCIe 3.0. Given that no GPUs currently available in the consumer segment can fully saturate or bottleneck on PCIe 2.0 x16 bandwidth there is no way to determine if ASUS' claims are true or just a BIOS trick that fools the OS into detecting PCIe 3.0. The only reason anyone would want PCIe 3.0 is for SLI/Crossfire solutions as PCIe 2.0 x8 is about the same bandwidth as PCIe 3.0 x4 so with more than 2 GPUs you will be running into some bottleneck on a PCIe 2.0 board. Personally I don't see what all the fuss is about, you lose only a tiny amount of performance via bottleneck anyway given that multi GPU scaling yields diminishing returns for every GPU you add past 2 anyway. There is no way to know for sure if the GPUs are bottlenecking or if it is just the scaling causing a performance hit. 

When we are talking at best an extra 1 or 2 FPS on only the highest end multi GPU systems vs PCIe 2.0 I don't see why any manufacturer would wast time and energy trying to implement PCIe 3.0 on an AMD board aside perhaps from doing what ASUS did and emulate it so far as the OS is concerned. Manually setting my Z97 Extreme 3 to PCIe 2.0 makes absolutely no difference to my benchmarks neither does setting it to PCIe 1.0 with my GTX 960 though 1.0 may bottleneck a higher end card, a little.
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