Tx750 or tx850 for CF-7970s, OC-i5-3570k

Would a Corsair tx750 be enough to power my build, or should I upgrade to a Corsair tx850?

overclocked i5-3570K @ 4.7GHz
dual 7970s with slight overclock
four 1tb hard drive
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More about tx750 tx850 7970s 3570k
  1. 7970 CF draws 520 on load so 750W would be enough.

    520W Gpu
    77W Cpu
    16W Ram
    15W Hdd
    25W Dvd

    =655W add some OC and goes 700W

    Tx 750 can easily deliver up to 900W so u dont need to upgrade.
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