The same old question: How much power supply do I need?

Hey guys, I'm building a new gaming rig, and I think I have a pretty good idea of how much power supply I need, but I wanted to double check, cause better safe than sorry and I'm still learning about this stuff.

So here's the build
Intel® Core™ i7-3770K Ivy Bridge 3.5GHz 8MB Cache Desktop Processor
2 x CORSAIR Vengeance 8GB (2 x 4GB) DDR3 1600 CL9 Dual Channel Memory Kit (so 16 GB in total)
Seagate Barracuda ST3000DM001 3TB 7200 SATA 6Gb/s HDD
Gainward GeForce® GTX 670 2GB GDDR5
ASUS DRW-24B1ST 24X DVD-RW DL drive ( I really have no use for a Blu-ray so eh)
All of that is going to be put in either an NZXT Phantom full tower, or a Thermaltake MK Chaser, depending on availability when I go to buy.

so question is, would 650W be sufficient, or should I go for 800-850?

I was thinking of getting the : Cooler Master Silent Pro M2 850W Plus Silver PSU if I needed that much power.
Or with:XFX ProSeries 650W PSU 80 plus Bronze.

Just to let you know, I don't over clock, I'm not gonna run crossfire / SLI, or dual screens or anything of that kind. I have one 19'' monitor at 1440x900 and that makes me plenty happy, so yeah.

What do you guys think?
4 answers Last reply Best Answer
More about question power supply need
  1. With my build (on my page) i'm only drawing 500 Watts max. You won't need more than 650 but to future proof I would go with a 750 as it would be cheaper than an 850 watt. Theres a really good power supply calculator I use and it's accurate enough. Remember, it's always good to have a few hundred watts more than you need so usually 150 to 200 watts more (for future add ons, over clocking, maintaining efficiency, capacitor ware) the site I use is by thermal take.

    Just fill it out and itll give you your answer (set capacitor wear, max the tdp out, and set the load to 100 to give you the MAX power your pc will use even though it will almost never do that just to be safe)
  2. Best answer
    Well, if we head on over to Extreme PSU Calculator and enter the info on your rig we come up with 378W. Well, they are known to be about 20% conservative on there power ratings. So we add 20% or 76W to what we already have and we get 454W as your MINIMUM PSU rating. That means if you got a 460W PSU that had 38A on the 12V rail/s it would only push out 456W at peak. You don't want to stress your PSU too much, you want at least 20% headroom, so you're looking for a PSU with a minimum a 545W which is pretty close to what scorpinock2 said.

    A great choice for your build to cover your needs and give you room to upgrade would be the NZXT Hale82 650W $48 shipped. It has a rating of 650W with 53A on a single 12V rail meaning it puts out 636W on the 12V line and comes with a 5 year warranty.
  3. Best answer selected by Rana-E.
  4. Alright, thank you both so much!
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