Help I have 2 x asus hd 7790 in crossfire

Paul Burgess

Honorable
Jul 14, 2013
3
0
10,510
Hello,

I have both cards in a couple of days now, its my first time with Asus cards and Im not impressed.

My old points of view GTX 460 (2 x 6pin)seems to handle games better and smoother.

I have tried running 3d Mark 11 on performance setting and out of 11 attempts only completed 3 times with worst score being 1166 and 7989 the latter is good and im happy with that.

When I open the gpu tweak from Asus I can boost up the clock MHz to 1200 but its unstable.

Gpuz shows both cards in crossfire but strangely the bus width and band width are different. 1 card shows 32 bit bus width and 25.6 gbs band width. The other card shows 128 bit and 102.4 gbs.

I am using driver 13.101.0.0 its a beta version but the most stable driver ive tried all the others from asus site.

I haven't registered them yet cause if I cant get them sorted then I will just buy 1 high end nvidea card.

Boths card are in the pcie x 3 slots.

I have a crosshair iv formula mobo
4x2 gb XMS ram at 1333mhz
phenomII x6 1090 t Black clocked to 4ghz
H70 Cooler.
psu AX850

Im happy with the power consumption of these cards ( 1 x 6pin) and they run very quiet but wish they performed better.

Any tips or help with this matter would be much appreciated.

Many Thanks
 
It's possible your second slot is set in BIOS to run at pci-e 1.0 speed. Go into your BIOS and check to make sure both slots are set to pci-e 2.0 (marked as "2nd gen" in some BIOS).

Also, do you have one card plugged into the bottom-most slot? The 4th slot on the crosshair is fixed at 4 lanes instead of the full 16.

Also, with crossfire, you'll want the 13.5 beta 2 drivers. As of now, afaik, it's the only set of AMD drivers with a frame metering implementation.
 

Paul Burgess

Honorable
Jul 14, 2013
3
0
10,510




No joy in bios did change from pci-e to pci just to see if it fixed but it didn't so I will change it back after new driver downloads.

Looking at the mobo PDF I have the cards in the right slots for crossfire

Nothing about changing power on pci-e slots though.

New driver didn't install properly so gonna try again.

Worked 2nd time but computer froze at post, had to clear CMOS to boot up

Just a thought will I have to install driver on both cards or will it install to both automagically?

Still the same, shall I take the lower performing card out and boot up then turn off and re install it? Could it be that simple?

Thanks