GTX 650 not working on its full speed

Hello
i am using GTX 650 Graphic card its PCIE 3.0 card
Using Asrock z77 Extreme 6 Motherboard
I have installed the card in PCIe 3.0 Slot But in GPUZ its showing bus interface
PCI-E X16@8x
Is it okay?
 
Yes it should be perfectly fine if the slot is PCIe 3.0 @ 8x. Cards currently can run full out on PCIe 2.0 @ 4x. Just a rough guess but 3.0@8X is about the same as 2.0@16x which is pretty standard.

It should not hold back your graphics card at all. There is a detail test that Tom's performed some time back that went over all the different speeds etc...
 


thanks for your reply
 

And one more thing why my ram max frequency is 667Mhz


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