Backward compatibility of PCI-E 3.0 with the old cards?

Decided to slowly upgrade my old PC, therefore it came out. Have an old but reliable video card Gigabyte GeForce 8600GT. Iron want to update parts:

1. PERC+Mother+Memory

2. SSD

3. Video card

If I take the first stage of the update, the mother with PCI-E 3.0, if it will start on it my video card? In games I play rarely (and then — in the old), so the performance issue for me is not necessary — the main thing that worked.
October 8th 19 at 01:01
3 answers
October 8th 19 at 01:03
Solution
If I anything wrong, then there is backward compatibility needs to be, ie should work.
My gut tells me the same thing, but I would like some proof — press releases, links to discussions etc. did not found. - stephania65 commented on October 8th 19 at 01:06
Yes please. - katlynn17 commented on October 8th 19 at 01:09
Mdaaa... And as I was looking for? Thank you! - stephania65 commented on October 8th 19 at 01:12
October 8th 19 at 01:05
It is important that PCIe 3.0 maintains backward compatibility with previous versions of PCIe.
http://www.ixbt.com/news/hard/index.shtml?14/03/51
October 8th 19 at 01:07
pci-ex controller for a long time sitting not in chipsets, and processors.

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