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XFX HD6870 wrong PCIe speed

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Jul 25, 2012
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Motherboard
Gigabyte Z68X-UD3H-B3
CPU
i7 2600K
Graphics
HD 6870
Mac
  1. iMac
  2. MacBook
Mobile Phone
  1. iOS
Solved: XFX HD6870 wrong PCIe speed

SOLVED.

I just noticed that my XFX Radeon HD6870 shows up as PCIe 8x in About this Mac. I checked, but it's in a PCIe 16x slot and the card is also capable to run in 16x.

Can someone with the same card please check and confirm that 16x is possible?

System Information.png
 
My 6850 is showing x16 in mountain lion.
 
Seems like you have something plugged in the second graphical PCI-e slot...
 
I have the same card and mine is working perfectly at 16x.
 

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Ive had the same thing since 10.7.3. I have a 6850. Its not the biggest deal, search on the forum. Some people have suggested disabling usb legacy option in your bios, and it has fixed it for some people, but not me.
 
fixed

Ive had the same thing since 10.7.3. I have a 6850. Its not the biggest deal, search on the forum. Some people have suggested disabling usb legacy option in your bios, and it has fixed it for some people, but not me.

Thanks for pointing this out (I thought I was the only one having this...). Found the solution in enabling BCLK setting in BIOS and setting the freq. to 100.3 Mhz. Now it shows 16x .

Thanks to all for your help
 
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