I got 6950(330Mh/s, replaced the 275gtx one), 275gtx(55Mh/s, in it's box), gaming pc, old pc with one pci-e x16(needs new psu). Only paying static fee for electricity, so it's practically free.
For some reason I have very hard time choosing one of these options:
1: Buy whole new pc insides 6950+6950 for mining rig, 275gtx for gaming pc = 550e
-- dual 6950 mining, 275gtx gaming/mining --
2: Buy 6990 for either gaming pc or old one(might not work?, will check if even 6950 works) and psu = 750e
-- 6950 mining/(gaming), 6990 mining/(gaming) -- prefer to use 6990 for mining.
3: Buy another 6950 for mining rig and psu = 290e
-- 6950 mining, 6950 gaming/mining --
4: Just buy psu for old pc = 50e
-- 6950 mining, 275gtx gaming/mining --
Annoyingly can't use directx11 while mining and also games drain mining speed a lot, ~25%+ gpu power lost to games over time.
Also not going to overclock as it would provide too much heat/noise. Not finding any dual fan 6990 thought, while I got 6950 with dual fan(with improved cooler) and it's very nice. Is there much difference between single and dual fan?
Is there any risk in any of those options? I'm not really a risk taker and most likely wont buy any more after this.