I recommend AGAINST it, davcon already posted the two reviews i usually reference, but it fails ATX spec when at moderate load levels which is horrible, ATX spec if pretty loose and it still cant pull it off. There are similarly priced units like the Corsair 750TX and the 750W units from XFX that are much much better.
From the Hardware Secrets review
"...t is only safe to run this new Cooler Master unit up to 450 W."
Thats pretty bad for a 750W unit.
Ultimately it's your gear and your decision.
Could be detrimental to the longevity of your hardware.
Will your psu run a 5870?
Yes! I agree with what ares1214 said in his last post.
A 5870 consumes close to 200W on full load next to nothing on idle.
I wouldn't play with the cpu as far as oc'ing goes.
Just budget for a replacement psu sooner then later.
Btw thanks for the kind words ares1214!
I appreciate it!
well i found good reviews for this powersupply, basically there mixes reviews, i think its very capable under 550 watts, anything over it overheats ur right, ill change it probably for a gold rated ps or the platinum when they come out, i know ill have to shell extra but peace of mind has no price , and i bought a mugen2 rev b to overclock, and a extra case fan a cm sickleflow fan blowing on the cpu
A 750W unit should be very capable up to 750W, if its only capable up to 550W what benefit does it have over the Seasonic S12II 520W unit thats a bit over half the cost but is capable beyond 550W?
Btw, what good review did you find of it? I havent seen any reputable sites give it a good review, it even failed the 3.3V ripple in the Tom's review, which is done in a Cooler Master facility, oopsie!