you put pci 3.0 gpu in pci 3.0,2.0 and 1.0 slot without any performance loss.
That is dead wrong. You can put a PCIe 3.0 card in a 2.0 slot without a performance hit FOR NOW, because there's no card yet that's faster than a PCIe 2.0 x16 lane. (3.0 is getting utilized for crossfire and SLI setups), but any modern card put on a PCIe 1.0 slot is going to be slow as all heck. You also have to be careful, because not everything is 100% compatible with PCIe 1.0.
OP, you're fine, however.