850watt more efficient then 460watt?

[NYbadboy911]

I have a 850watt corsair 80+ efficent power supply now my old pc had a regular 460watt psu. is the 850xt corsair more efficient then my old 460watt? or my electric bill will be higher with the 850 corsair?

 

[zedman3d]

The 850W is more efficient yes.

If you have an old system that uses something like 400W then the 850W Corsair will still be more efficient.

 

[gurusan]

The corsair PSU is more efficient, but that doesn't have much to do with its wattage rating.

 

[zedman3d]

The corsair PSU is more efficient, but that doesn't have much to do with its wattage rating.

Well a tiny bit, not just any 850W is instantly more efficient but if your system demands 450W and your using a 450W MAX psu then yes wattage does have to do with it i think due to increased heat.

But yes your right, i think the Corsair is rated 80+ at 20%, 50% and close to max?

EDIT: Yep.

80%+ energy efficiency at 20%, 50% and 100% load condition for less heat generation and lower energy bill.

 

[MrCoffee]

The wattage rating is the max it can supply, not the amount that it draws. The effeciency of the PSU is a function of the total system power draw but the max rating is more or less irrelevant when you're talking about the same computer.

I.e. your system components need X power so the output of the PSU will be X and the draw of the PSU will be X/0.80 (80% efficiency).

So say for example your computer needs 250W output from the PSU, your old PSU is 70% efficient and the new one is 80% efficient.

The old PSU will draw 250/0.70=357W

The new PSU will draw 250/0.80=312W

The maximum amount of power the PSU can supply (460W or 850W) is irrelevant to your electric bill.

 

[pickyantivirus]

Packard bell PSU

hi there guys im in a bit of bother
i have been given a nvidia geforce xfx 9600 GT as a present to put into my packard bell imedia x2424, its compatible but i need to know if the Power supply is the right wattage for the card. i cannot find the wattage of my PSU anywhere! help is very much apreciated. thank you

 

[zedman3d]

The wattage rating is the max it can supply, not the amount that it draws.

The max that its rated to supply at a decent efficiency rating, check most PSU's stats youll see an 850W PSU be able to have an absolute max of 1000W or something along those lines.

 

[gurusan]

Re: Packard bell PSU

hi there guys im in a bit of bother
i have been given a nvidia geforce xfx 9600 GT as a present to put into my packard bell imedia x2424, its compatible but i need to know if the Power supply is the right wattage for the card. i cannot find the wattage of my PSU anywhere! help is very much apreciated. thank you

It comes with a Q6600 so I would assume it has at least a 400W or something similar.

Anyway, the 9600GT is quite an efficient card and I would just plug it in, it should be fine.