Quick PSU question

liamcrane · 21 Jan 2011 at 10:34

Hi all

Just curious to know a few opinions on these 2 PSU's.

I have an antec true blue 750w, it has four 12v rails i believe they support 25 amps each so a total of 100 amps

The thing is i really like the NZXT PSU range and there 750w PSU only has one 12v rail which supports 68 amps

Would it be fair to say the PSU i have is superior to the NZXT one? Dont really want to fork out £100+ for something that just looks good but doesn't perform as good

Hope you can help

Regards

Liam

Cool Breeze · 21 Jan 2011 at 11:24

Why would you buy another PSU if your one is OK?

Personally I think separate rails are better, the load is spread accross the overall output of the PSU better.

It just seems of late that all psu 's come with one big fat rail, not sure why this is maybe an advancement in tech?

But I would save your money unless you really need it.

[WU-TANG]GZA · 21 Jan 2011 at 11:30

Agreed if your PSU is fine then don't change but unlike above post. I prefer one single rail with lots of amp. Hence my Corsair TX950 with 78a single rail, overkill for my system but with PSUs I'd prefer it that way than underkill

Lemin · 21 Jan 2011 at 11:54

The PSU you have is superior to the NZXT one.

liamcrane · 21 Jan 2011 at 11:55

cool thanks for the input guys i have no intention of changing it as im one of those that believes dont fix wat aint broke

Just liked the look of the white nzxt psu would like kinda cool in my new phantom, but performance over looks i guess is the way forward

Hagar · 21 Jan 2011 at 12:05

One fat rail is useful if as some designs use one rail for CPU and both graphics. Thus if you have 125W + 2 x 200W at 12V, the amperage is 525 / 12 = 42A. Even if the design is just the PCIe graphics on one rail, it can exceed 25W with SLI or crossfire. Load sharing across rails is a useful feature in this case, Cheap PSU's probably dont.

Tealc · 21 Jan 2011 at 21:26

Some PSUs have one rail artificially split into multiple rails by current limiting devices anyway so a lot of this rail balancing stuff is wholly unnecessary. Not quite sure why PSU makers do it but it might be for efficiency reasons. I know they split the rail because the ATX spec used to require it and besides more is always better, even if the manufacturers can inflate their amperage by stating max loading per rail and hide the combined overall amperage.

Aretenon · 22 Jan 2011 at 01:24

The Antec doesn't have a maximum output of 100 amps, on the 12V rails each rail has an 'advertised' maximum of 25 amps, each, but once you start loading them up, you won't be able to load them all up to 25 amps.

The NZXT is superior to the Antec in being 80Plus Gold, and possibly having longer AUX12V cables but apart from that, pretty equal. They have equally good voltage regulation and ripple and noise suppression. Don't know about the acoustical noise tho, but the 750W version of the Antec was tested at SPCR and did reasonably well.