[SOLVED] Z77 Mpower can't detect second graphic card

Hi everyone
I'm experiencing a problem with my Z77 Mpower.
It's not able to detect the second graphic card.
The complete configuration includes:
Z77 Mpower
i5 2500k
2*4Go G.skill 1866MHz
GTX680
8800GT
Crucial M4 256Go
Corsair AX750
The idea was recycling my old 8800GT as a dedicated physx card
Due to massive cooling the GTX680 will be installed on the second port
Both graphic cards works perfectly when installed alone and I also tested with a GTX570 and results are the same
When I install only one card, it works on 1st port at 16x or 2nd port at 8x,
but if there is 2 cards installed only the first works and bus-width is 8x according to CPU-Z, the second one is invisible in windows, GPU-Z or driver
I didn't tested the 3rd port because my sandy bridge has limited pcie lane
I tested it with bios 17.4 and beta H53, results are the same, I also tried with and without 6 pins power supply on the mainboard and the problem is still the same.
I tried this graphic cards configuration on a gigabyte z68 ud4 and same cpu, ram, vga and psu and it works perfectly.
Is there a bios setting to enable multi gpu ? (tried to enable igp multi screen without result)
Is it possible to have defective pcie port for multi gpu when all pcie ports works alone ?
I have another question about this motherboard
is it possible to have a dynamic vcore related to eist while overclocking ?
on the gigabyte z68 ud4 it's possible by setting vcore on normal and playing with load line calibration and offset
on the mpower this settings appears in bios but are not graduated the same way and I don't understand how they works.
Thanks for your help

Thanks for your help flobelix
I already tried and benched this physx configuration on my old gigabyte motherboard
in non physx games the 8x limitation barely don't affect the gtx680
in physx games the 8800gt isn't fully loaded and framerate is near the gtx680 alone with physx disabled.
this configuration gives physx graphical bonus without affecting framerate
the 120W limit of the MK13 may be for fanless use, I have 2 90mm fans attached directly on the heatsink and under furmark the card runs 20°C lower than stock cooling and is very silent
I also kept the stock molded metal plate that cool the power supply and ram under the MK13
But due to this cooling this card can't be installed on the first slot
on the gigabyte until you set the dedicated physx card in the driver both cards and all outputs on cards sends the same signal to screen (bios screen is also sent to all cards)
on my mpower only the first sends signal to screen, but i should be able to set (only for testing purpose) the 8800gt as main device and the gts680 as physx card
unfortunately it don't work because it looks like when a card is plugged on 1st port the mainboard disables the 2nd

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BrennonTB wrote:
I Just ordered the HP Pavilion Model Number is m7-1015dx i really really look forward to getting this laptop it has really really good specifications for the price. The only thing that has been bugging me really bad is that "Can you upgrade the Graphics Card in this machine?" Since i am using the for Hardcore Gaming and School.
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[SOLVED] Z77 Mpower can't detect second graphic card

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