Need help with PSU wattage + last look at my home build (I think I did my homework!)

Hey hardware geniuses!

The last three days I've been spending a loooot of time researching for my new homebuilt desktop aimed at video editing while still being on a budget (I aimed for around 1500$). I figured it would be cheaper (and more fun!) to go for a home built machine, but boy, for a newb in that area (whilst still being skilled at using computers) there's a lot to know. I followed a videomakers suggesting for a build but since it was from feb 2013 there's already been a lot of new additions to the market. So hopefully my build is still legit as I think I've nailed all the compatibility issues (oh boy, there's a lot!). So firstly, taking a quick look at my build - I haven't done anything 'illegal' have I?

The thing is I just ordered all my hardware but I guess I can still cancel things if you find I've made a mistake! Anyways, my biggest concern is actually regarding my PSU! It was the last thing to buy and just as I pressed buy I realized they (and all other in my country, Denmark) wouldn't be able to ship my Corsair RM750 Gold within almost 3 weeks! And I really hoped I could be up and running within a week since I got an editing job to do.. All other parts should arrive before monday. The build schematic I followed suggested a 750 W so I just went with that in my mind, but the Corsair RM650 W is indeed in stock everywhere, wonder why though. It just seems that the Corsair one is the only one that's indeed compatible with the i7 Haswell while still not being extremely expensive and not a cheapo product (I took this forum's advice in getting a good one!) - and being sold in Denmark!! I've used a LOT for reviews and ratings, and the Corsair one seems like the only one to get. So my question is.. do I REALLY need the 750W one or could I just go for the 650W??

I'll list my specs as follows with all the wattage specs I could find, but I'm just afraid there's something I overlooked.

CPU: Intel Core i7 4770K / 3.5 GHz - 84 W
Graphics: MSI N760 TF 2GD5/O - 2 GB - 170 W (got of nVidiea webpage, not MSI, correct??)
MOBO: ASUS Z87-PRO (V EDITION) - can't find any, says typically 50 W for ATX-board??
Memory: G.SKILL Ripjaws X Series 2x8GB 2133 DDR3 - can't find either..
HDD: Seagate Constellation ES 1TB - 6.4 W
CPU Cooler: Cooler Master Hyper 212 Evo 2.64 W

And well, the case: Cooler Master HAF 912 Plus. Has three fans I think?
I'll probably throw in a DVD-writer as well.

In total that's 313,04 W excluded whatever case fans, DVD-writer and RAM consumes. I read you have to like multiply your watt with 1.5 for peak values as well as the PSU being more stable at 70% performance or something like that. With all that in mind 650 would seems sufficient, but am I missing something?

Any help is greatly appreciated and thanks for this awesome forum with so many dedicated people - I've used your inputs more than you can imagine the last couple of days!

Regards from Denmark
3 answers Last reply
More about psu wattage home build homework
  1. 650 is plenty.
  2. Thanks for the quick answer! I might upgrade to 32 gb ram in the future - I would believe that's okay as well? Is the real problem and the real use for 750W+ mostly if you go for 2 graphic cards?
  3. Yes, you can upgrade to 32gb memory later. And yes, 750+ is more for 2 cards, thought it depends on the cards of course.
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