PCI-Express 1.0 x16 vs. PCI-Express 2.0 x16 — is there a significant difference?

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We all know that the difference in transfer speed on the pci-express bus has doubled, but is associated with a number of questions:

1) do All bus capabilities are used by modern graphics cards, or visible doesn't make any difference if you insert, for example, a GeForce GTX460 in the PCIe 1.0 and 2.0?

2) How to check the exact throughput? I found a PCIe Speed Test v0.2, but it works only on graphics cards from ATi

3) are There already motherboard with an honest pci-express 2.1, or the difference between 2.0 and 2.1 no?

I am interested in all this in the context of games, and in the context of CUDA
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The transition to PCI-E v.2 does not give advantages in comparison with the previous
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1. If both slots have honest 16 lines, at high resolutions the top-end graphics cards would be a loss of ~5% FPS in the transition from 2.0 to 1.0.
2. In what sense exactly? Line 1 — 500 megabytes per second. You suspect that you have "Chinese" line drop cap?
What you'll really be able to pump data in terms of CUDA that's another issue that lies in the area of practice.
3. In speed there is no difference in features there is a difference (in developers fees, and not their users). Implementations are not.
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More recent tests. www.thg.ru/graphic/pci_express_sli_scaling/print.html we Can assume that 8x pci-ex 2.0 = 16x pci-ex 1.0
There is a difference. But it is very minimal and appears only in higher resolutions and sli/crossfire tandems.
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