Computer only recognizes 2 grafic cards

[Remedin]

hello, i am building a miner with following components:
board: asus p5q deluxe, cpu: intel c2d e6600 RAM: 4x1 gig corsair: power supply: enermax revolution 1020W.
GPU's: 2x 5870 2X5850
OS: windows 7 x64(clean reinstallation already done)

my problem is the computer only recognizes 2 of the cards. and yes, i am using vga dummy plugs
if i change 2 cards he ever recognizes the cards which are on the blue pcie slot and the card on the bottom pcie slot(black)
i am using 1x pcie risers to connect the cards.

does anyone have a clue where the problem can be?

thx, remedin

[runlinux]

I would check to make sure that putting a card in one of the other slots doesnt disable the rest. I had that issue with my GA-695P-DQ6.

Use both x16 slots and all of the x1 slots are disabled.

Checking the user manual of your board now.

Well, it doesn't say anything...

[Remedin]

Use both x16 slots and all of the x1 slots are disabled.

it seems to be so, but i cant find any option for this in the bios

[Remedin]

anyone a idea how i can fix this?

[50BTC.com]

Intel P45 handle 16 pci-e lanes for first two slots and ICH10 have another 4 lanes for the rest. Try to install cards to pci-ex16_1, pci-ex16_3, pci-ex1_1  pci-ex1_2.   

[Remedin]

i disconnected all cards and connected only one to pci-ex1. bios beep code says no grafic card. whats wrong with the bios settings?

[Ilikeham]

See here;

https://bitcointalk.org/index.php?topic=36061.0

[Remedin]

tried to bridge the contacts but still doesnt detect the grafic card on 1X slot
EDIT:
tried to bridge it on the motherboard(bridged it on the riser before) and now it seems to work!
THANK YOU GUYS, YOU ARE THE BEST!!!

[Ilikeham]

Didn't even think you might do that , yeah a little piece of wire and bingo it generally works fine. Glad your issue was solved.