build new system - 7970 + 7870 is crazy?

[goemon888]

7970 Sapphire Oc boost
7870 Sapphire
advice for mobo? am3+ or fm2?
Corsair Tx750 or tx850?

Help.. Thanks

[dogie]

If its purely for bitcoin mining then no that's not crazy.

If you only want 2 GPUs, find the cheapest dual PCI-E board you can find, preferebly MATX, then a MATX case with good airflow. Cheapest processor to go with cheapest motherboard.

Nice and compact, cheap, replicible. It only really gets complicated if you want something like 2x7990 and a 7970 in 1 machine.

[middlemarkal]

on the 7870 try to find a Tahiti LE version like the MYST.