I ordered my system
CPU i7-920 D0 stepping
MB P6t-deluxe v2
RAM OCZ Platinum DDR3-1866 9-9-9 timing
HSF ultra120exteme PSU CORSAIR CMPSU-850TX
HD 7200.12 - 500GB - ST3500418AS
Blu-Ray Pioneer - BDC-202BK - OEM
GPU1 Sapphire 4890-1gb
GPU2 Sapphire 4890-1gb
I got such a good deal on the 4890 $209 with $20MiR so $199, I bought another one for $209 but no MiR. But now I am fairly certian that the PSU will not suffice. I will not be overclocking now, but definitely in the future. I am still waiting on the CPU in the mail.
I don't have power requirements for the fans but this is what I have.
3x250mm @ 700rpm ( I know that they are 230mm but the PSU calculator I used only had a spot for 250mm)
1x140mm @ 1200rpm
1x120mm @ 1200rpm (u120e)
and with all my system specs listed above at 100% TDP and 100% load and 25% aging , It calculates 622w. so if a 850w psu is 80% efficient then it will have 680w max, so without overclocking it seems like I am very close to the limits.
Please help! Do I need to return the PSU to Newegg and order another one, or is 850w good for this CF setup, or maybe my calculations are fuzzy?