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Author Topic: ECS P45T-A and 4 GPU's?  (Read 582 times)
Meatball
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June 17, 2011, 07:09:00 PM
 #1

I doubt it, but is there anyone out there that is using the ECS P45T-A motherboard and multiple cards?  The board has two full size PCI express slots and two x1 slots.  I'm using x1 extenders and can't seem to get all four slots to run 4 Radeon 5770's I have.  I can get 3, but the fourth has the fan spin up, etc., but just isn't seen.

I've tried both Win XP and Win7 and should have more than enough power (700W PSU and the 5770's only pull 100W).  I've got 2 GB of RAM, a single SATA drive and Celeron 430L.

I was able to get all four recognized once by plugging two cards into the full size slots and running two other cards using extenders out of the x1 slots, but any time I started up the card in the main full size slot all the other GPU's dropped down to 0% usage.

Anyone have that board and using it with 4 cards, or does anyone have any thoughts?

Thanks!
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Meatball
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June 18, 2011, 04:00:23 AM
 #2

Finally figured it out.  I was able to narrow down which card wasn't getting recognized by mucking around with fan speeds.  Once I figured out that it was the card in the secondary full length PCIx slot I tried shorting out the 'Presence Detection' pins and it started working.

My guess is with the old 4 PIN ATX power plug to the mobo it just wasn't giving enough juice to all four pci express slots.  Seems to be working like a champ now though.
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