x2 not x16 bus interface ??

[recoil101]

Hi, first off here's the relevant tech details about my rig :-

Motherboard - ASUS P6T Deluxe v1
CPU - Intel i7 2.67
Graphics - ATI Radeon HD 5970x2


The graphics card is a single card with dual GPUs on. The card is in the blue primary PCIe slot on the motherboard.

I've been experiencing sub par performance in games in relation to fps, and decided to do a bit of digging to try and find out why. When I used a diag tool to give me some more in depth info on the graphics card I was a bit surprised by the bus interface info.

To be specific the Bus Interface info is "The graphic card reports that it supports : PCI-Express x16 v2.0 it is currently running at PCI-Express x2 v2.0" on the first GPU and "The graphic card reports that it supports : PCI-Express x16 v2.0 it is currently running at PCI-Express x16 v2.0" on GPU 2.

Why only x2 and not x16 on the first GPU??? Is this to be expected??

I've had a look at the BIOS but can see very little PCIe configuration options. I've tried reseating the card with no change. I'll try it in the secondary PCIe slot (which the mobo manual states is also x16).


Am I just wrong to be scratching my head at this or is there something wrong with the pc somewhere???

Any help greatly appreciated!!

 

[recoil101]

Sorry, I should have mentioned that I ran the stress test (full screen) and it stayed at GPU1 2x, GPU2 16X. Left it running for a few mins and no change.

Thanks for the prompt replys!

 

[recoil101]

My board and bios are pre 2009 so those aren't enabled anyway!! Thx

 

[recoil101]

Eddyr - Its in the PCIE_1 blue slot (described in the manual as the primary slot for a single graphics card). There are no other cards in the remaining PCIE slots.

Kaapstad - Yes mate, particularly Guild Wars 2. Getting 10 to 15 FPS a lot of the time which seems odd, I know it's not the most up to date 'uber' hardware.. but still...
Having said that, I'm certainly not alone in expecting higher FPS than Im getting in that particular game. I just wanted to be absolutely sure that there wasnt something wrong with my setup. A friend is running with an HD6970 (more up to date but a single gpu) and he's getting a solid 60 fps with ultra graphics. Sigh.... computers....

 

[recoil101]

I've no idea how to disable a gpu unfortunately, can't see anything in catalyst about it.

I've run the render test and monitored the GPU useage. Gpu1 (at 2x) was running at around 95% and Gpu2 (at16x) was running at around 85%.