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-   -   7950 pcie x16 running @ x8 (http://www.hardwarecanucks.com/forum/video-cards/61082-7950-pcie-x16-running-x8.html)

ChacePoint May 5, 2013 02:23 PM

7950 pcie x16 running @ x8
 
Hi,

I just got this new card and it is running at half the maximum speed of x16. I have it in the first slot in my motherboard and according to the manual it should automatically switch the the fastest speed, but it isn't. I am only running one card and there does not appear to be an option in the bios to manually switch the speed
I am aware that the difference in speed is negligible. I would like to figure out what is causing this though, does anyone have any ideas?

My motherboard is p8z77-v-lk
card is Newegg.ca - SAPPHIRE 100352-3L Radeon HD 7950 3GB 384-bit GDDR5 PCI Express 3.0 x16 HDCP Ready CrossFireX Support Video Card

AlienIsGOD May 6, 2013 09:08 AM

try running GPU Z and do the render test and see what it says in the bus interface box. It may be power management settings keeping it at a lower bus rate.

ChacePoint May 6, 2013 12:54 PM

doesn't work :(

Masteroderus May 6, 2013 02:34 PM

My understanding is the motherboard is "PCIE 3.0 READY" and sandy bridge processors only run PCIe 2.0.

Then I looked @ asus.com and read this: PCIe 3.0 speed is supported by Intel® 3rd generation Core™ processors.

Are you running a sandy bridge processor or an ivy bridge?

3.0charlie May 6, 2013 02:47 PM

User manual, chapter 3 page 20: NB PCIe configuration.

ChacePoint May 7, 2013 05:52 AM

Hi all thanks for the replies, I am running IvyBridge my card reports pcie 3.0 x8 no pcie 3.0 x16. I have changed that bios setting nb pcie. I also have my card in the tops slot (blue) I hear about this blank video card or switch card needed in some motherboards?

lowfat May 7, 2013 09:12 AM

That hasn't been needed in years. It should switch automatically. But make sure the card is under load while you are checking.

ChacePoint May 23, 2013 07:45 PM

any other possible fixes for this? could it be that the card is somehow damaged?

TedShackley May 23, 2013 09:53 PM

Quote:

Originally Posted by AlienIsGOD (Post 707341)
try running GPU Z and do the render test and see what it says in the bus interface box. It may be power management settings keeping it at a lower bus rate.

what render test, in GPUZ ??? I have 2nd newest version but don't see test


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