Hey, i have just gotten another XFX Radeon HD 7770 Black Edition and GPU-Z reports PCI-E Speed as x8 2.0 for my main card and x1 2.0 for my secondary card under load. What is also wierd is that after a reboot, both cards shows x8 and performs good, but after around 30-45 minutes of idling the speed of the secondary drops down to x1 and won't go up again. Also the Bus Width of the secondary card shows as 32 Bit at all times while the other is at 128 Bit, and bandwth shows 20.8 GB/s for nr. 2 and 80.0 GB/s for nr. 1. My specs are below. MB: ASUS M4A89GTD PRO/USB3 CPU: AMD Phenom II X4 965 3.6GHz RAM: 12GB DDR3 1333 MHz GPU: XFX Radeon HD 7770 1GB Black Edition + XFX Radeon HD 7770 1GB Black Edition S PSU: 550W 500GB and 1TB harddisks Windows 7 Ultimate 64-bit http://gpuz.techpowerup.com/13/02/03/s7.png Anyone have any ideas why this is happening? Help would be much appreciated!