Im deciding what PSU wattage I should go for, 600w or 750w?

Im on a 600w PC, I got a new GTX 770 and it requires 42A on the +12 rail. So I need a new PSU,
I currently have a IntelCore 2 Quad Q9400 2.66GHz and I think I might need to change my processor soon so would it take up much wattage? Im afraid if I go for the 600w it might not be enough for a new processor in the future. But nothing too expensive like 'intel i7'

PSU Corsair 600w has 46A on the +12 rail
PSU Corsair 750w has 62A on the +12 rail

So which should I go for ?
2 answers Last reply Best Answer
More about deciding psu wattage 600w 750w
  1. It will depend on the make/model of your existing 600W PSU. A good quality 600W will be fine for that card and a 95W CPU.

    The GTX 770 does not require 42A capacity. It is a 230W card;
    ...that would relate to ~20A on the +12V rail. A 95W CPU, ~8A.

    If you still need to upgrade due to a cheap PSU, a 600W Corsair will be fine for one card.
  2. Best answer
    CX series from Corsair use poor capacitors.

    Best 750 watt on the market:

    PCPartPicker part list / Price breakdown by merchant

    Power Supply: EVGA 750W 80+ Gold Certified Fully-Modular ATX Power Supply ($94.99 @ Newegg)
    Total: $94.99
    Prices include shipping, taxes, and discounts when available
    Generated by PCPartPicker 2014-06-12 20:47 EDT-0400

    jonnyguru review below.

    Performance (40% of the final score) - 10. I mean, really... were you expecting any other score in this category today? Beyond excellent ripple suppression, beyond excellent voltage regulation, easy pass for Gold efficiency both times. I mean, come on... if anything deserves a perfect score here it's this unit.

    Functionality (20% of the final score) - and it's getting another 10 here, as well. We have a fully modular unit with very nice black sleeved cables. The manual's decent. There are lots of connectors. There's a switchable fanless mode. EVGA gave us a little test adapter to see if it works before we use it. There are lots of other goodies in the box. Can you find something to complain about here? I certainly can't.

    Value (20% of the final score) - Newegg's offering this unit for $129.99 right now, with a rebate on top of that. I can't score on rebates, but I can drool all over that price. It's directly competing with the Thermaltake Toughpower Grand, which may or may not still be the same one I reviewed. That said, the real competition is from Seasonic. Their KM3 750W is ten dollars more money. And you'd probably think EVGA has this all sewn up based on that alone. But... XFX has a Seasonic built unit at this same price point, so this category is not a lock like we saw with the 850W model. I'm going to go with a 9.5 here. When a Seasonic build is your only competition, you're doing it right. In fact, I'm almost ready to say that it is Seasonic who is competing with this one than the other way around.

    Build Quality (20% of the final score) - as was the case with the 850W, I still want to see that fan control switch wiring cleaned up some. There's a little more glue on it this time holding it to the modular board insulation, but it still looks rather like an afterthought. There's room for that switch directly on the back panel... how about we do that instead, Super Flower? 9.5.
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