Raidmax

The OCZ is better.

I wouldn't power my system with anything that raidmax makes.

A good quality 450W PSU can easily handle an HD4870. Neither of the 2 PSUs you linked can handle 2 4870s due to a lack of necessary PCIe connectors. Corsair TX750 would be a good choice.

^ +1
If you are thinking of xfire in the future, make sure the psu has the needed PCIe connectors.

Stick with brands such as corsair, antec, pc power & cooling, and OCZ.

one of them is ocz...

as for the pcie connectors they're both crossfire ready? and have 2 pcie connectors.

kurt

I'm aware of that. I was simply naming the better brands as an alternate to the raidmax the OP had listed first.

ok, so is the ocz unit i have picked a good one? I've read a couple reviews most of them said they were great but one said it failed at 50c i plan on having a ton of cooling in my case and i dont really understand what that is other than when kept at 50 celsius it didnt provide the power it said it would,although i'm nowhere near what the unit can produce.

Personally, stay away from Raidmax. I have had 2 of them, one of them the Volcano modular series, 630watt. One of them died in about 3 months, the Volcano died in about 2 years. But, long before it died, I started having some stability and drive problems for quite a while, and I just could not nail them down. Began to think maybe my motherboard was going south. After the install of a new BFG 680 LS series, all my little "bugs" simply vanished, literally.
PC and Power Cooling makes some very good power supplies.

pc power and cooling is owned by ocz and they both use the same shop to make their respective products, so i guess i'm gonna go for the ocz then, the other would have saved me liek 80 with my case choice (combo on newegg) tahnks guys

kurt

2 HD4870 requires 4 PCIe connectors.

PC P&C and OCZ are not built by the same OEM.

i read it on hardocp when i read their review of the modxstream 700, that after ocz purchased pc p&c then they switched all production to sirtec.

OCZ production, not PC P&C.

ok thanks for the clear up
kurt