Power Supply - The Battle of OCZ and Antec

[JonJ678]

There's more to power supplies than the rated wattage. For one thing the pc p&c is good for 420W continuous at 40 degrees, it wont be hard to find 600W ones that can only output this at 25 degrees. Since the inside of the psu gets hot, the 600W rating isn't worth jack.

There's an argument for over specifying the psu, say getting a 600W when you need 400W, as they are more efficient around 80% load. Therefore cheaper to run. Once electricity costs come into it suddenly the very efficient £80+ ones look more reasonable

I really like pc power and cooling, but this doesn't mean the corsair/ocz will be good too.

 

[PermaBanned]

If you were willing to spend a bit more then this would be the perfect choice. Up to 87% efficient and Quad Rails. Should really be more money than it is, but i'm not complaining:

http://www.overclockers.co.uk/showproduct.php?prodid=CA-026-BQ&groupid=701&catid=123&subcat=1083

 

[JonJ678]

Four rails are worse than one. This is part of why it is cheap.

650W. Lets optimistically assume it can throw out that much at 12V, which it wont be able to. 650/4=162W per rail. So your 5800 can have 162W of power, as can the processor. Whereas the 420W pc power and cooling can offer 400W less whatever the processor uses, so 200W nominally to each, plus if either runs at less than 200W it has more free for the other.

The be quiet is therefore a worse power supply, and a nice example of wattage doesn't mean much.

"Four separated 12 V rails (QUAD RAIL) for optimal power supply"

 

[PGdude]

I see.

So the OCZ has 432W over 2 rails (18A each), then that's 216W per rail, which is well enough for the single GPU 5800 cards.


Here is a similar OCZ PSU, namely, the stealth. I don't understand this table because it looks like the 3.3 and 5V are added into the 12V or.... huh?

What does that mean?

 

[PermaBanned]

Four rails are worse than one. This is part of why it is cheap.

650W. Lets optimistically assume it can throw out that much at 12V, which it wont be able to. 650/4=162W per rail. So your 5800 can have 162W of power, as can the processor. Whereas the 420W pc power and cooling can offer 400W less whatever the processor uses, so 200W nominally to each, plus if either runs at less than 200W it has more free for the other.

The be quiet is therefore a worse power supply, and a nice example of wattage doesn't mean much.

"Four separated 12 V rails (QUAD RAIL) for optimal power supply"

Each component isn't dedicated to one rail. Certain connectors are dedicated to certain rails. And if i'm not much mistaken the 5800s use more than one connector. It was my understanding though that rails didn't matter much in the slightest, as long as they were done properly. If one is under too much strain then it will offload onto another one.

 

[Lightnix]

I see.

So the OCZ has 432W over 2 rails (18A each), then that's 216W per rail, which is well enough for the single GPU 5800 cards.


Here is a similar OCZ PSU, namely, the stealth. I don't understand this table because it looks like the 3.3 and 5V are added into the 12V or.... huh?

What does that mean?

I think, basically speaking, the power supply can deliver up to 481W on the 12V rails, presuming that the 3.3v and 5v rails aren't loaded at all, which is totally unrealistic.

 

[nitr0uk]

+1 Antec