i just used a power calculator and i found it is 438 W with hd 6850 and 488 with gtx 560 ti
so u think cx 430 v2 that can get up to 531 or the cx 500 v2 ? http://extreme.outervision.com/PSUEngine
That seems a little high to me, i just tried it using multi HDD's, 4 RAM sticks, i3-1200 and 6850 and it showed it only needed about 280w. Did you make sure you clicked 1 on "Physical CPU". The i3-2100 might have 2 cores, but its still only 1 CPU unit. This is the only way how I can see the calc gave you such a high PSU recommendation??