Any recommendations on a cheap mobo to run 2 or more 5850?
Also, how much of a power supply do you think it will take to run two of those together? just speculating tough, not planning on doing that yet hehe
msi makes pretty good motherboards for mining. a lot of people here use them. i have a couple of their 870A-G54's, in two dual-PCIe miners. they make motherboards with more slots than that.
just a personal preference here - if you're going to use AMD GPUs, you oughtta use AMD processors and chipsets. works for me.
for your PSU, add 125% of your GPU running at 99% (in watts), to triple the wattage your CPU consumes. hard drives are negligible. fans are a bit - don't forget to add them in. if your miner is dedicated it shouldn't even have things like speakers or CD/DVD drives.
so a 6850 (~150W) plus a 5850 (~180W) plus 25% = ~410. plus a 45W Sempron single-core X3 = 135W. plus 3W for an SSD and 25W for fans gives a grand total of about 575W.
a 650W PSU should do nicely.