Quick crossfire question

[Skunkworks]

I just put another 4890 in my machine to give it a boost. In GPUZ I get the following details:

Card 1: PCI Express x16 v2.0
Card 2: PCI Express x16 v1.1

I'm using an Asus P6T deluxe with the latest BIOS.

Is this correct, or do I need to adjust something in the BIOS?

EDIT:

According to the manual:

3 x PCI Express 2.0x16 slots (at x16/x6/x1 or x16/x8/x8 mode)

 

[MeMeMeMe]

test the performance in a game or in a benchmark. It's possible GPUZ is just reporting it wrongly.

 

[Skunkworks]

I don't have any benchamrk software, but I used Fraps to get an FPS display in Rift.

When I disabled the 2nd card there was no drop in FPS, maybe even a slight increase of 3-4, but I can't be sure as I did it in a pretty unscientific way.

I'm getting the feeling something is working.

 

[Surveyor]

I assume you're using the blue and the white PCI-E slots.

Sounds daft but have you:

a) connected the cards with a Crossfire connector

b) enabled crossfire in the Catalyst Control Centre

c) connected the necessary power cables from your PSU to the graphics cards

 

[Skunkworks]

Yes to all of those, and GPUZ is reporting that Crossfire is enabled.

Can you recommend any free benchmark software that is compatible with DX10?

 

[Surveyor]

You could try the free edition of 3DMark Vantage:

http://downloads.guru3d.com/download.php?id=6

 

[Skunkworks]

You could try the free edition of 3DMark Vantage:

http://downloads.guru3d.com/download.php?id=6

Thanks, I shall give that a go.

A couple of screenshots of GPUZ, just in case anyone spots anything suspect.

It's now saying both cards are running at 1.1!

 

[Surveyor]

Could be any of the following:

GPU not seated properly
Dirty contacts
Oddity with northbridge / GPU driver
Bad motherboard
Bad GPU

Or, as GPU-Z says, "power saving features may affect the results displayed".

Download Furmark:

http://majorgeeks.com/FurMark_d4183.html

You can run this in a Window so you can have GPU-Z open at the same time and see if stressing the cards ups them from 1.1 to 2.0.

 

[Skunkworks]

Single card: P12012 3DMarks link

Crossfire: P18914 3DMarks link

It’s definitely working, I just don’t know enough to know if it’s working to full potential. Oh well, I’m still happy.

 

[Surveyor]

Looks OK.

19k here:

http://hardforum.com/showthread.php?t=1419225

17k here:

http://forums.overclockers.co.uk/showthread.php?t=18008480

19/20k here:

http://i4memory.com/f37/hd4890-single-crossfire-stock-vs-oc-vantage-16359/

 

[Skunkworks]

I was having a few random lock-ups over the last few weeks, so I flashed my MB to the latest BIOS and left everything at default. I'll give it a few more days to make sure all is well, then I'll bump this thread with some OCs and see what I can get.

Thanks for the input, everyone.

 

[Surveyor]

Thanks for the input, everyone.

You're welcome.