Re: PSU question
 

Doubling your wattage and saving $50 on your bill is not going to happen. Even though it may be more efficient you're still going to be using more power due to your newer components. There is no way a computer that is going to be using 400w of DC @ 80% efficiency is going to use less power than a computer using 200w of DC @ 70% efficiency. And its generally better to get a PSU that will be running around 70-80% at full load. There is no need to get a 1200w psu or anything overkill like that if you're just going to be running a Dual core and a single or maybe even dual GPU setup. If you want something that will let you run a heavily overclocked quad and a 4870x2/ gtx295 then go for a corsair HX620. Anything you get over that is going to be overkill (unless you can find a TX750 for less than the HX620 I would go for that)

Re: PSU question
 

Lies, all lies.
It can happen, and did to our bills

Re: PSU question
 

Other things can effect your bill. Like the price per kw can drop or it could be cooler the next month, etc. You cant say that your PSU caused your power bill to drop $50 (then again Australian money is like monopoly money just without the buying power)

Re: PSU question
 

I suppose kow_ciller is suggesting that the math of such an idea just doesn't ring true...and he would be right. I am not trying to start an argument, I am simply stating that 10% less wasted energy from a substatially higher rated power supply is not going to result in a significant reduction in overall electricity usage, if any reduction at all.

Re: PSU question
 

Even a high quality 500W will do just fine if your not running SLI/Crossfire.

I've had the same 500W Seasonic powering two builds now without a single problem. I have a pretty heavy OC on both my CPU and vid card on this system (in sig) and did on the previous build it was in, and haven't had a single problem.

What you really need these days is enough amps on the +12V rail(s). For example a 500W with high +12V amps (like my Seasonic) will power a high end system just fine, but a 750W with low amps won't. Getting a 80-Plus certified PSU is also well worth it IMO.

Re: PSU question
 

Ahh, thanks, i only knew the acronym of UPS translated to my language.
SLI/Crossfire won't happen for a long time i guess, so it's out of hat for now. Yup, i'm aware of this +12V rail requirement...well, the 550W psu i'm considering to buy delivers 45A on a +12V single rail, so that should be enough then. Anyways, I shall wait a few months till purchase, cuz prices will fall radically by then.

All these comments make me to realize that i only should buy a 750W psu if:
1. I'm planning to build a really serious rig (nuclear plant, maybe:))
2. the price of a 750w psu with good efficiency and amps does not exceed significantly the price of a lower level psu.

Lads, i greatly appreciate sharing your experiences, but pls, cool down a bit, no need for fights, keep this discussion friendly;)

Re: PSU question
 

That will be more than enough.