[simon741]

I currently am using a 420w psu that came with my case. Should I get a new one if I buy a 7800GT? Is there anything wrong with this one? Is changing ur PSU a hassle?

 

[pjlietz]

Is there a name on your psu? How many Amps on the 12v rail. If it is a no-name PSU I would recommend an upgrade regardless of the video card. As for changing it out, thats very easy to do.

 

[zone]

I recommend the Sunbeam Nuuo 550W if you ever decide to buy a new PSU.
It's more than enough to handle your system.
Nothing difficult about changing PSUs if you know how to use a screwdriver

 

[simon741]

But dont you have to plug all of your cables back in?
EDIT: What would happen if I didnt change it?

 

[prostate05]

Well yeah you have to plug all the power cords back in. However, that isn't that difficult, just remember what kind of plug was plugged in where. And the problem with running a system off of a power supply that does not have ample 12V rails, it may not power the system correctly or could even blow and take some of your components with it.

 

[zone]

Yep you will have to do that. Take note where each cable is (make a drawing if necessary) before unplugging things.
Besides... you won't be able to plug most connectors unless you're doing it the right way.
Just don't force it.
If you feel you're really forcing it then it means you're most probably plugging it the wrong way or not all pins are aligned (on an IDE cable for example). Take your time when doing it.

 

[simon741]

any cheaper? how do i find out how many amps are on my rail?

 

[one43637]

keep the motherboard instruction guide handy.

 

[simon741]

waht u meen?how do i find out how many amps are on my rail?

 

[bluedevil]

there should be a sticker on the side of your PSU that tells ya the specs

 

[simon741]

well it says +12v and -12v.

 

[bluedevil]

so you see an "A" rating? under 12V

see the pic to see what I mean.....mine is 26A

 

[simon741]

mine is 18A
edit: its a 450w not 420w

 

[bluedevil]

upgrade time man...that 7800 gt is gonna need it....

 

[simon741]

grrrrrrr

 

[bluedevil]

or... you can just go for a 6800gs....which requires less power....

 

[simon741]

no that wont last me as long

 

[Evo]

what are the minimum 12v+ rail for 7800gt

 

[pbasil1]

Quote:

Originally Posted by Evo what are the minimum 12v+ rail for 7800gt

probably somewhere around 20-24amps.... nowadays u want no less than 24amps on the +12v rail...

 

[Evo]

because i order one i only have 18a 12v+ so ill have to buy a new psu do you think i could get away running the 7800gt for a week