Yep, in the blue slot. re-seated twice now.
I've had the card for about four months. I was trying to troubleshoot another problem (lockup) and this card seemed to fix that problem. It's been stable since I installed the 6850 until a couple of weeks ago. Then the lockup/freeze started again and that's when I noticed cpu-z,gpu-z reporting the x8. So, no, it has not been shown to operate at x16 since I've been looking at it.
I do have a USB 3.0 card in the short slot right next the video card. I monitor the gpu temperature and it rarely gets above 48-49c.
I am new to building (managing hardware?) computers. I think I will be looking at the power supply next (Corsair 520W) as I have replaced everything else in this build chasing the lockup/freeze. The reason I mention that is because I was wondering if low or inappropriate voltage would drop it to x8? And who would I know? GPU-z says "power saving features may affect the results displayed" in the Bus Interface popup. VDDC lowest: 0.950V, max at 1.150
I just noticed CPUz is reporting the Graphic Interface Link Width as x8 - Max Supported x16 on the 'Mainboard' tab.
Catalyst, on the other hand, is reporting the 'Maximum Bus Setting" at PCI Express 2.0 x8 in the graphics hardware information section. It seems one is reporting the board at x8 and the other is reporting the card a x8. So it seems.
It should be noted the only place I've seen the PCI e 2.1 in on the online specifications - don't know if that necessarily is accurate for my card.
http://us.msi.com/product/vga/R6850-Cyclone-1GD5-Power-Edition-OC.html#?div=Specification
as per MSI I will be trying the card in another computer next week to see if it runs at x16 on that one (thanks Dan! for letting me use your computer!)
I have discovered MSI Kombustor. I get artifacts on the combined both the normal and extreme tests. I have never overclocked the card.
CPU is Intel