Biostar A870 at Newegg for $65 has 4 pci-e slots, but you will need slot extenders
Thats exactly what I bought. I am having issues installing ubuntu on that board.
What about you?
i haven't had any mobo related issues. i had some trouble getting ubuntu to install from usb stick onto my HDD. it didn't want to overwrite the windows partition that was already on it. so i just erased the whole disk and then installed ubuntu on it, and had no problems. of course, you don't even need a HDD to run a mining rig, just a usb stick.
have you tried just running it with a usb stick?