Pics below - they are links as 1st they are large and 2nd I don't want to trash this thread anymore than I have to :)
Here outlined chips on the back of card:
http://rapidshare.com/files/39657854...ck_problem.jpg
Here are close up of the side of cards with backplate on near the problem area - prior to mounting washers.
If you look into the large white capacitor in the middle, 1st problem is the wires coming out of it on the back of PCB.
Without standoff they were touching backplate on 2 of my cards.
The chips are just left to this capacitor and it is visible there is no clearance between it and backplate.
http://rapidshare.com/files/396578122/DSC02900.JPG
http://rapidshare.com/files/396578123/DSC02901.JPG
You can't put washers just on the some of the standoffs - this might cause backplate/PCB to bend, just put them on all.
+1 for
cstkl1 answer - you can't leave the middle 3 screws when mounting the backplate easily - to do that you would have to dremel/mill the standoffs on the backplate as they are exactly over those screws so no go.
BTW - Been thinking about it myself but washers are easier and that's what EK advised too.