[Dash-X]

Hey...

I heard that a 9800GT graphics card needs at least 450W PSU (Power supply) and at least 26Amps on +12-volt rail?? There's some connector coming with the GPU, which makes 2x 4pin's to a 6pin.

Does this mean if i buy a PSU, i need to check if the +12volt rail has 26 amps?!?! I need to buy a killer PSU to make it work?

Or are the +12volt rails the 4pin's? So i could turn 2 of them together into 6pin to connect the GPU?

Please, explain this to me. This is so confusing

[BG-0]

You will need 26 A on the 12 V rail. This one has 35 A, so there's some extra for comfort: http://www.newegg.com/Product/Produc...82E16817703015
The 4 pin connectors are just connectors, nothing to do with the rails.

EDIT: here's a bit more inexpensive unit: http://www.newegg.com/Product/Produc...82E16817139008

PS: the wattage rating has nothing to do with the adequacy of the PSU. Only the 12 V amperes matter... Along with the quality of the unit and the temperature at which the amperage ratings have been measured.

[brite750]

if you look at psus many of them have more than 1 12v rail, you need them to all add up to at least 26amps and get at least a 600watt.
My sons both have 8800gtz vert similar to the 9800gt and one has a 550 Antec and the other a 650watt Coolermaster both work fine.
the adapter is in case your psu doent have a 4pin, but has a 6pin, you can get all sorts of adapters I wouldnt sweat that too much.
If the card has a 4pin you can get molex to 4pin or the new psu may have a 6pin and that is what the adapter is for.

[brite750]

Corsairs are nice but I would go with a more powerful if you can, however that one does meet the criteria

[Dash-X]

I have checked some PSUs... Some have 2x +12V rails So is there any way to connect these 2 to the GPU?

[brite750]

you dont just plug the card in, forget about the rails, you need the supply to have 26amps total is all, they are basically telling you not to expect your card to work on some cheesey crap psu

[brite750]

in other words they are not telling you you need 26amps going to the card, just a total of 26amps min available for your whole system

[Dash-X]

so you're saying...+3,3V: 28A, +5V: 27A, +12V1: 13A: +12V2: 14A, -12V: 0.8A, +5VSB: 2A

This is good enough?

Edit: It has 1x 24pin, 1x floppy, 4x molex, 2x sata, 1x 4pin, 1x pci-e
By the way: If y buy a PSU that has the vent on top, can i turn it over to be on the bottom? just to be sure nothing bad happens if i do?

[brite750]

Originally Posted by Dash-X

so you're saying...+3,3V: 28A, +5V: 27A, +12V1: 13A: +12V2: 14A, -12V: 0.8A, +5VSB: 2A

This is good enough?

barely, what brand? I would not cut it that close myself, keep in mind that most companies rate their psuz at ambient temp (70deg F), as the temp goes up efficienceny goes down, and of course inside of a pc case when running the psu is much hotter than ambient temp so I would get something a bit more meaty

[brite750]

if you are talking about the fan, they just take a picture that way, fan faces the bottom of the case, not the top.

it sucks in and blows out the back

[Dash-X]

oh, taht's cool And the psu is a 420W RedWing Xilence.

What about this then:
480W RedWing Xilence.
+3,3V: 32A, +5V: 31A, +12V1: 15A: +12V2: 16A, -12V: 0.8A, +5VSB: 2A

Or This:
550W Xilence
+3.3V - 33A
+5V - 32A
+12V1 - 17A
+12V2 - 18A
-12V - 0.8A
+5VSB - 2A

Which one's the best for me

[Dash-X]

Here's another stupid question:

''in other words they are not telling you you need 26amps going to the card, just a total of 26amps min available for your whole system''

So you're saying: my current psu: 400W
+3.3V - 18A, +5V - 13A, +12V - 9A, +12V - 13A, -12V - 0.3A, +5V SB - 2-5V

That's Total of 55.8A Seems to be more than enough?!?

[brite750]

Originally Posted by Dash-X

oh, taht's cool And the psu is a 420W RedWing Xilence.

What about this then:
480W RedWing Xilence.
+3,3V: 32A, +5V: 31A, +12V1: 15A: +12V2: 16A, -12V: 0.8A, +5VSB: 2A

Or This:
550W Xilence
+3.3V - 33A
+5V - 32A
+12V1 - 17A
+12V2 - 18A
-12V - 0.8A
+5VSB - 2A

Which one's the best for me

I have never heard of that brand, I would try to find some technical reviews on that brand and model before I would tie them into my graphics card. The cheaper the brand the more they lie about their rating, good brands are proud of their product and are less prone to BS.

[brite750]

Originally Posted by Dash-X

Here's another stupid question:

''in other words they are not telling you you need 26amps going to the card, just a total of 26amps min available for your whole system''

So you're saying: my current psu: 400W
+3.3V - 18A, +5V - 13A, +12V - 9A, +12V - 13A, -12V - 0.3A, +5V SB - 2-5V

That's Total of 55.8A Seems to be more than enough?!?

not quite 12volt amperage not total for all the rails, in your case you have 9 + 13, thats it

[brite750]

for brands i would stick with Coolermaster, Antec, thermaltake, corsair, and a few others , reputable brands that get tested by independant reviewers constantly