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Is 600W PSU too much?

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May 7, 2012 4:25:53 PM

Hi
This will be my first build.
I5-2500k
8gb DDR3 1600Mhz
AsRock Extreme4 Gen3
H60 (I've got lazy and decided on this against air cooling.)

There won't be a graphics card as virtually no gaming will be done, although I do have a fanless 4350 which I might throw in there (I read that the HD3000 out-perform that so that putting that in might be pointless).
Between 3-4 hard drives.

I've seen a CoolerMaster Silent Pro 600w (it's modular, which I quite like the idea of), excellent reviews etc, but after running the proposed system through a PSU calculator I'm starting to think 600w is way too much.
(The calculator recommended a min. of 282w.)

What do you all think, and if it is too much, what do you recommend?

More about : 600w psu

a b ) Power supply
May 7, 2012 4:43:33 PM

Yep 600W is 'too much' for your system. I have an i5 2500k at 4.4GHz, 2 sticks of RAM, 2 HDD in RAID 0, H70 and a GTX 560 Ti and I use 440W from the wall running prime95 and furmark. just running prime95 (which is about the most stressful/power consuming thing the CPU can do) it uses 180W, so add the 80% efficiency into it (roughly) it uses 144W, call it 150 for the extra hard drives.

So back to the original questions, you should be using a max of 150W on your PC,
looking at the efficiency curves of PSUs (just generic curves) your PCs load would be drawing at a pretty un-efficient percentage (PSU efficiency seems to drop rapidly below 20% usage) If you care about the environment then I'd get a smaller PSU, if not, well keep your current one!
May 7, 2012 4:59:11 PM

Thanks for that rapid reply and for the extra info.

Seen as the calculators 'output' said 282w, would you recommend a 300w or 350w (or even possibly a 400w)? Also, is there a particular brand you recommend?

Do hard drives (even the old IDE's) draw such little power? I always thought they drew quite a chuck.
I think that maybe why I initially looked for a higher wattage PSU.

Again, thanks for the info.
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a c 83 ) Power supply
May 7, 2012 5:16:40 PM

So that you have the power later if you want it, I'd get a high quality 450-500W PSU. Gold rated if possible. That will allow you to use your computer now, and even add a good GPU later if you need it. And the gold rating will help you use less power, even at lower power draws. (Gold rated PSUs need to be 88% even at only 20% of draw. For a 500W, this means 100W.)
a c 158 ) Power supply
May 7, 2012 5:25:40 PM

300-350W is more than sufficient for a PC with no discrete GPU. Seasonic and Antec both make some nice PSUs in that range. The Antec EA-380D is a great little PSU.
a b ) Power supply
May 7, 2012 5:46:04 PM

premg18 said:
Thanks for that rapid reply and for the extra info.

Seen as the calculators 'output' said 282w, would you recommend a 300w or 350w (or even possibly a 400w)? Also, is there a particular brand you recommend?

Do hard drives (even the old IDE's) draw such little power? I always thought they drew quite a chuck.
I think that maybe why I initially looked for a higher wattage PSU.

Again, thanks for the info.


Those calculators always overestimate everything, which is why I ended up buying a 700W PSU in the end for my build (based on its calculations)... doh!

as per the other users on the thread, I'd recommend a good quality 400ish-450W PSU.

possible options are:

Antec EA-380D (suggested by Rugger)
Corsair CX430
XFX core 450W / XFX pro 450W (it's the same PSU, just called different names)

the options above are all "80+ certified" (either standard or bronze). If you can afford to get an 80+ silver or gold PSU then go for it!
May 7, 2012 5:54:11 PM

yeah if it says less than 300 watt needed then i recommend a 400 watt psu just so theres a bit of extra power if needed.
a b ) Power supply
May 7, 2012 6:11:54 PM



I never even knew that those top two even existed. In the UK the EA-380D seems to be the lowest wattage "quality" models around on the popular PC websites. are they hard to find in the US?
Well you learn something new everyday don't you ;) 
a c 158 ) Power supply
May 7, 2012 6:19:21 PM

Those low-wattage Seasonic's have been on Newegg for a long time...not hard to find here. ;) 
May 7, 2012 6:28:52 PM

Brilliant.
You guys are ace.
I'm thinking either the Corsair CX430 v2 or the Antec EA380D.
Similarly priced so I guess it'll come down to what cables/connectors they come with and what I need.

Just to throw a spanner in the works.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Apparently it's a SeaSonic S12II/M12II in a white case.
Like I said in the op, I quite like the idea of a modular PSU, although, I understand that they're pretty much all aesthetic over any type performance improvement.

Did a quick search for both of the SeaSonic units mentioned by Rugger, nothing in the UK. U.S market only type thing I guess.
a c 158 ) Power supply
May 7, 2012 6:42:00 PM

That MK III made by Seasonic would be another great option. I'd go for the Antec EA-380D or the PC P&C MKIII 400W....whichever is least expensive.
!