performance of pciexpress 2 or 3 graphics card on pciexpress 1 interface

[adn23]

hi,
i want to know that what is the total performance loss of a pci expess 2.0 or 3.0 graphics card on pci express 1.0 interface?

 

[aevm]

Performance will suffer a noticeable amount (e.g. losing 40%) in some games (e.g. Dirt). In most games however the loss will be very small.