It looks like your motherboard does have a PCIe 2.0 slot. It says "half length" slot. As long as the slot is a regular old PCIe x16 2.0 slot and not a weird different slot then you might be able to find a 7750 that might fit. depending on the case and location of the slot you could try to do some hacking and run with the side panel off and stuff a bigger card in that hangs out of the case a bit.