How many graphic cards can work on this Motherboard? Please Help

Hey guys;

Was wondering if it possible to add 1 to 3 more cards to my pc for mining? I have a Asus P7H57D-V EVO motherboard with a I7-875k @ 4Ghz processor and 1500w thermaltake thoughpower. Going to add a second psu for 1-3 new cards.

Motherboard has the following pcie:
2 x PCIe 2.0 x16 (single at x16 or dual at x8/x8 mode) one used, waiting for the other card to be placed here.

1 x PCIe 2.0 x1 (5GT/s, blue slot)
2 x PCIe 2.0 x1 (2.5GT/s, gray slots)

I have these three pcie x1 slots and am wondering if its possible to connect 1 to 3 cards on them will be powered from a separate psu.
I will be using a powered pciex16 to pcie x1 riser with the usb cables for ease of maneuverability of pc in case I need to move it for clean up or other reasons.

Checked manual and saw the IRQ assignments tried to read about but didn't get it.

Manual download site:

If you can please shed some light that would grateful. :-*
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More about graphic cards work motherboard
  1. your board can run 2 gpu's, yes it has more pci-e slots but there meant for addin cards for raid and ethernet.
    the other slots dont have the required bandwidth to run a gpu and get the best from it.
    so it would be a waste of time. even running 2 cards at x8 will slightly bottleneck the gpgpu performance adding in more pci-e will reduce that x8 even further as the cpu only has 16 lanes to share between all the pci-e sockets.
    if your semi serious about mining then either jump to 2011 socker or am3+ as both offer more pci-e lanes that aren't embedded in the cpu.
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