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Rig detecting card ok, but not SLI

Tom|Nbk

Tom|Nbk

Tom|Nbk

Soldato
Joined
12 Mar 2006
Posts
23,070
Location
N.E England
Forgot just how stressful multi gpu can be, just got my new 480, hooked everything up, installed the bridge and straight away issues :rolleyes:

Basically my machine will pick the other 480 up perfectly, installs and shows two gpu's in device manager it also shows available for physx use. It won't however let me use the 480 as an SLI card.

GPUZ is showing card 1 as 1x bus speed and card 2 at the full 16x bus speed so something obviously isn't right.

Worth a windows wipe?

Anyone shed a light?
 
Check both cards are seated correctly, sometimes it will show x1 because a card isn't quite sitting in the socket (I did this after putting in a 2nd card, must have joggled card 1 slightly).
 
Have you tried reinstalling the drivers Tom? i.e total wipe, use Driver Sweeper and install latest?
 
sorted, this is massively embarrassing but...

I'd installed the card into the 1x mini PCI-E slot in my hurry after work. This was revealed after I removed the first card and saw :o

Been a long day :rolleyes:
 
With 2 cards installed the PCI-E lanes should automatically switch from a single x16 to x8/x8.

Something is preventing this from happening.

Edit

Ooops on your part.
 
You should still have been able to enabled SLI tho even with it in the 1x port :S unless its one of those boards with the NF200 or similiar bridge chip which for some reason doesn't support SLI on slots not connected via it.
 
Nevermind it's working 100% now. Thanks anyway

Works fine with my PSU but my PSU doesn't half ramp up the fans so I reckon I'm going to have to get a new one unless I use headphones for gaming it'll drive me insane :p

Pulling 640w in BF3 Rroff.
 
Last edited:
I think its the GPU fans.

My power consumption is still 100w off continuous. Thats in BF3 also which is a very graphically demanding game etc.
 
640w is 10 more than my 470's oc'd at 750mhz, (stock 630mhz), id say the noise is more likely the gpu fans, 400 series cards can be hot running beasts.

EDIT, you can use afterburner to show fan use % and temps etc on screen.
 
And/Or the extra GPU = extra heat in case = PSU working harder with higher ambient temp = PSU and other fans working faster.
 
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