Gigabyte HD 7850 2GB OC in PCIe 1.1x16 Slot

[K2 Khan]

What will be the perfomance decrease whwn I install the Gigabyte HD 7850 2GB OC card in PCIe1.1x16 slot; as my graphic card is PCIe3.0 compatible?
The Mobtherboard is Intel p45 chipset but I don't know which motherboard that is.
Other specs are Q6600 @2.4GHz, 2x2GB 1333Mhz DDR3 Kingston RAM and Enermax 535Watt PSU.

 

[RCFProd]

Questions and answers of a relevant topic in the following thread:
http://www.tomshardware.co.uk/forum/349048-33-will-pcie-card-work-pcie-slot

Expect the CPU and RAM to hold you back on performance. The CPU isn't powerful and the newer games run best with 8GB RAM.

The cheaper Enermax units are usually really bad. PSU replacement might be required soon.

 

[X79]

I believe you might get a substantial performance impact, as anything PICe 2.0 and above is alright.

You might also see a bottleneck due to the CPU.