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Title: [1 LTC BOUNTY] Getting mobo to detect 5th GPU Post by: miztaziggy on December 27, 2013, 07:36:24 PM I have a Gigabyte 990XA-UD3 board.
It has in this order: PCI x1 PCI x16 PCI x1 PCI x16 PCI x16 Now with 3 cards plugged directly into board in the 3 x 16 slots all 3 are detected and work fine. With cards in 1x risers, the card in the second (middle) x16 slot isn't detected. I have 5 cards plugged in but Win 8 only sees 4. I have tried to short out pins A1 and B17 on the x16 slot, but with them shorted the mobo won't turn on. I have tried this on 1_x16 and 2_x16 slots and it won't boot with either of them shorted. I saw someone post about changing PCI latency to 32 which apparently might help, but there is no such setting in the BIOS. What's the trick to getting the BIOS to detect this card? Title: Re: [1 LTC BOUNTY] Getting mobo to detect 5th GPU Post by: Boxman90 on December 27, 2013, 09:13:12 PM Is that shorted the 16x slot with the card in directly or with all cards in via a 1x riser?
Title: Re: [1 LTC BOUNTY] Getting mobo to detect 5th GPU Post by: miztaziggy on December 27, 2013, 09:29:34 PM Is that shorted the 16x slot with the card in directly or with all cards in via a 1x riser? No that's the 16 slot shorted exactly the same way as I would with the 1x slots. Short the socket and then plug in the riser. Do I need to short pin A1 and pin B81 instead on a 16 times slot? Title: Re: [1 LTC BOUNTY] Getting mobo to detect 5th GPU Post by: Boxman90 on December 27, 2013, 11:13:12 PM Is that shorted the 16x slot with the card in directly or with all cards in via a 1x riser? No that's the 16 slot shorted exactly the same way as I would with the 1x slots. Short the socket and then plug in the riser. Do I need to short pin A1 and pin B81 instead on a 16 times slot? No, it should be shorted exactly as the 1x bridge. PCI-e is a bus, so the slots are actually interconnected on the same lane. I got mine working with 4GPU's that way, never tried 5. Title: Re: [1 LTC BOUNTY] Getting mobo to detect 5th GPU Post by: dual6990s on December 28, 2013, 02:42:23 PM Powered risers?
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