PSU Question

[S13DET]

Ok, I just ordered all my computer parts for my new gaming rig(first ever). here are the specs.

E6300 C2D
2GB PC26400 Ram
Gigabyte DS3 MoBo
Liteon CD/DVD drive
eVGA e-GeForce 8800GTS 640mb
Coolermaster Extreme 500w PSU

The question for this post is will my power supply be able to power my GPU and rest of my computer? My GPU says it needs 26Amps on the +12V rail. But my PSU only has 16amps on the +12V rail, but has a second +12V rail at 16amps. So will it work?

Thanks for your time!

PSU

 

[Farva]

Ok, I just ordered all my computer parts for my new gaming rig(first ever). here are the specs.

E6300 C2D
2GB PC26400 Ram
Gigabyte DS3 MoBo
Liteon CD/DVD drive
eVGA e-GeForce 8800GTS 640mb
Coolermaster Extreme 500w PSU

The question for this post is will my power supply be able to power my GPU and rest of my computer? My GPU says it needs 26Amps on the +12V rail. But my PSU only has 16amps on the +12V rail, but has a second +12V rail at 16amps. So will it work?

Thanks for your time!

PSU

No, 2 rails will use the power on their own rail, completely seperate of the other. Look for a PSU that has a large, single rail.

Ninja edit: That is a terrible PSU too. Look for OCZ, Power PC & Cooling, Silverstone, and many more.

 

[wdn]

Ok, I just ordered all my computer parts for my new gaming rig(first ever). here are the specs.

E6300 C2D
2GB PC26400 Ram
Gigabyte DS3 MoBo
Liteon CD/DVD drive
eVGA e-GeForce 8800GTS 640mb
Coolermaster Extreme 500w PSU

The question for this post is will my power supply be able to power my GPU and rest of my computer? My GPU says it needs 26Amps on the +12V rail. But my PSU only has 16amps on the +12V rail, but has a second +12V rail at 16amps. So will it work?

Thanks for your time!

PSU

The card will come with a Y cord that lets you plugin in two different Molex connectors, one from Rail 1 and the other from Rail 2. Then you plug it into your video card.

 

[Mansize_tissue]

No, 2 rails will use the power on their own rail, completely seperate of the other.

What about PSU's like the Silverstone ST85ZF which have 4 +12v rails rated at about 18a (peak) each, i think; this is more than enough to power a G80 card so it must be the combination of rails. When a PSU +12v rail is rated, no matter how many rails there are they still show the combination of them as its rated amperage. Sorry about the poor wording.

 

[S13DET]

Thanks for your responses. I got the card from the brown santa today, and i see the split cable for power.

I was unaware of Cooler MAster having not good PSU's. Newegg reviews seemed ok. Once I get some extra money ill pick up a different PSU.

Thanks agaiN!

 

[[Spectre]]

The card will come with a Y cord that lets you plugin in two different Molex connectors, one from Rail 1 and the other from Rail 2. Then you plug it into your video card.

No in a spec compliant ATX12v2.0 PSU 12v2 feeds the processor alone through the 4pin P4/AUX connector. 12v1 feeds all the molexs and the rest of the system.

 

[[Spectre]]

The question for this post is will my power supply be able to power my GPU and rest of my computer? My GPU says it needs 26Amps on the +12V rail. But my PSU only has 16amps on the +12V rail, but has a second +12V rail at 16amps. So will it work?

Thanks for your time!

That 26a figure is a combined 12v rating for the entire system not just the card.

 

[Farva]

That 26a figure is a combined 12v rating for the entire system not just the card.

Oh, I see how it is done now. So you really don't need to have a single rail?

I'm still a power newbie, so I will be hanging around here for a while

 

[[Spectre]]

Oh, I see how it is done now. So you really don't need to have a single rail?

For 99% of users single versus multiple 12v rails doesn't make a difference. And not all multiple 12v PSU actually have their OCP enabled

 

[Farva]

For 99% of users single versus multiple 12v rails doesn't make a difference. And not all multiple 12v PSU actually have their OCP enabled

I'm sorry, OCP?

 

[[Spectre]]

I'm sorry, OCP?

Over Current Protection is what limits each 12v rail to a certain amperage. If you have a 3x12v design you are (most of the time) still feeding the 12v's from one source but limiting it with OCP. If you remove the OCP you have a single 12v PSU that is simply labeled as a multi 12v PSU.

 

[Farva]

Over Current Protection is what limits each 12v rail to a certain amperage. If you have a 3x12v design you are (most of the time) still feeding the 12v's from one source but limiting it with OCP. If you remove the OCP you have a single 12v PSU that is simply labeled as a multi 12v PSU.

So how do you know OCP is on the device? Would this be the same for a 4x12v design?

 

[[Spectre]]

So how do you know OCP is on the device? Would this be the same for a 4x12v design?

Well it is supposed to be there to limit the rail to whatever it's max advertised value is in compliance wit hteh specs.......in practical terms there isn't always a way to know if it is present for a normal user. With a load tester though you simply set the tester the max limit and then ramp up until it shuts down. If you can't go beyond the printed limit OCP is present..if you can........

Some multi rail units like some Seasonics don't have the OCP set so all of the 12v capacity is available to any 12v device that needs it even though it is labeled as being 3x12v or 4x12v.