Will I be able to overclock a 7950 with 620 W power supply?

[sharki9876]

I wanna OC
heres the PSU I'll be using

http://www.ncix.com/products/productdetail2.php?noheader=1&sku=52176

and the 7950, one of these 2
http://ncix.ca/products/?sku=67546&vpn=GV-R795WF3-3GD&manufacture=Gigabyte
http://ncix.ca/products/?sku=67619&vpn=AX7950%203GBD5-2DH&manufacture=PowerColor

Also, is powercolor a good graphics partner? I don't hear of them much. If not, what would you guys recommend? Maybe the gigabyte would be better for OCing since it has 3 fans, even if its a bit ugly.

Thanks in advance

 

[coozie7]

Good choice on the powersupply, it'll handle an overclocked HD7950 easily, even with an overclocked CPU.
If you're going to overclock you'll need something like the Gigabyte card, the Powercolor card has a reference cooler, which is fine for normal uses but will quickly become both hot and noisy when the card is pushed.
Two points:
One, overclocking has no warranty, some cards do well, others are poor overclockers, so do n't set your hopes too high.
Two, cards like the Gigabyte dump all their heat into the case, it is importaint your case is well ventilated for the cooler to work well.

 

[sharki9876]

okay, i'll keep that in mind. this is the case i'll be getting

http://www.ncix.com/products/productdetail2.php?noheader=1&sku=60883

it has room for fans on top and a built in fan in the front so maybe that will be enough ventilation? I mainly want it cuz its pretty and cheaper than the haf 922.

also, I just want to OC the 7950 because it looks like everyone else with that same card does. also, 800 mhz seems a tad low, especially since ATi bragging about how the 7xxx series comes with 1ghz at stock. does it really matter if i squeeze out an extra 100mhz?
thanks for the quick answer.

 

[coozie7]

Should be no problems with ventilation.
I'm not against overclocking (my rig is ) just letting you know that it's a lottery, some overclock like deamons, others struggle to gain a few MHz.