Which one card are you talking about? The one that is on the PSU with the 3 with the new BIOS?
I tried to figure it out if the problematic cards (those that refuse to work at 1.09) are a different brand.
Cant say why they are refusing to work at 1.09. All my cards they work the same no matter the type of slot I put them in.
(Those in X1 slots they do hash a bit slower though...aprox 40Mh/s lower.)
At the time I had 4 cards running at stock voltage the consumption was around 1170W. By lowering the voltage to 1.09 it went down to 788W.
I havent tried mining BTCs yet except for a min so I cant say about that but mining LTCs I get the same hash rate on the x1 slots as I do on the x16 slots.
This is wierd though.
On my Windows 7 rig I have 3 cards. All the same Sapphire 7950's 20G model.
The cards show up as 0, 1, and 2. Card 0 is the card my monitor is plugged into.
Card 0 already has the BIOS you linked me to. Cards 1, and 2 have the stock BIOS. All three cards run 625 KH/s like this.
I flash the BIOS you linked me to to card 1. (I use a DOS bootable USB with ATIFlash to flash.)
So at this point cards 0 and 1 have your BIOS, and card 2 has the stock BIOS.
I boot info Windows and run cgminer. Same settings and everything that I used to run 625 KH/s before.
Cards 0 and 1 mine fine, 625 KH/s but card 2 mines at 450 KH/s. I never did anything to card 2. All I did was flash card 1 over to your BIOS from stock.
So I figure maybe because its the only one on a different BIOS. I dunno I know prob not but whatever.
So I flash card 2 with your BIOS.
Boot into Windows and run cgminer. Now cards 0 and 2 run fine, 625 KH/s but card 1 now runs 425 KH/s.
I tried deleting any .bin files and it never helps. I dont understand how this could be.
And I tested with 2 other BIOSs on the BAMT rigs and they will not no matter what boot with cards in the x1 slots unless they have the stock BIOS. I tried both regular booting and safe mode and it will get to the part where X is supposed to start and then the screen will flash a couple times and then it just goes blank. The monitor is still on but there is no display on it.