I've been mining for over a month or so now with only a single XFX 5770 on my general purpose dell desktop. I recently picked up another card on the cheap from a friend (Sapphire 5770) and ordered an x1 extender (with the slot cut in the end) from cablesaurus.com. For the life of me I can't get the two card setup to work.
I'm connecting one card to the x16 slot on the mobo, and using the x1 extender on other available x1 slot. I have attempted to use the jumper method by shorting the pins on the x1 slot that I've seen posted several times and have both cards hooked up to monitors through DVI. I'm fairly certain I have sufficient power for these two cards (500W with Intel Q6600, single HD, nothing special really). I'm running Windows 7 64 bit. Both cards work when plugged into the x16 slot directly.
When I boot the system with the x1 extender on one card, the fan on the card starts spinning, which seems to indicate the extender cable is working I think. However, I can't find any indication that Windows, Guiminer, GPU Caps Viewer, or Catalyst is finding it. Is there a reason maybe my craptastic motherboard (whatever came with the Dell system when I ordered it) won't work with this even with the x1 pins shorted?
I have scoured the forums for solutions. Is there some other trick I am missing? Or simply faulty extender cable?
Thanks for your time.