PSU for a GTX 260

12Volts @ 20Amps = 240watts. That seems most unusually low for a 550W PSU.
We'd expect to see something closer to 450W of +12V power.
Is there a +12V1 20amps and +12V2 20amps or anything like that on the PSU data sheet?

Here is a data plate of a budget 550W PSU. Note the +12V1 and +12V2 each have 18amps.
The maximum combined +12V wattage is 432watts which works out to 36Amps.

That Colorsit PSU won't handle a GTX 260.
You're pushing it even with a 8800GT. Glad it didn't broke  

Change the PSU. Are you an Indian?
Mention your budget...

Agree, change your PSU with better one...
How much do you want to spend?

This would work except it has only 1 PCIe plug:
Corsair 400CX (30 amp 12 volt rail)
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

My first choice would power any CPU and just about any single GPU:
Corsair 550VX (41 amp 12 volt rail)
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I don't particularly like the Corsair 450VX (33 amp 12 volt rail)
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
It is just not enough improvement in usable power over the 400CX.

Hi Guys, thankyou all for your replies. much appreciated

I dont really have a budget, just dont want to spend a lot, i bought the comp for about $950 2 years ago, it was ready made and the specs were all good and used good manufacturers, i thought it was quite a good deal. Now i thought i'd spend $200 on the GTX260.
Tbh i dont know enough about PSU's, i just assumed the guy who made it would install a decent one, in fact i looked at some new ones before posting here but wasnt sure if the V1 amperage and V2 amperage are added together (thx for clearing that up WR2)

here is the dataplate pic

http://img40.imageshack.us/img40/2766/p10600852.jpg

And one of my comp, case is a thermaltake soprano

http://img63.imageshack.us/img63/2766/p10600852.jpg

By the way i'm not Indian, i'm from london, but the assumption amuses me  , i must have sounded like a cheapskate

Looks like that 550 corsair would be a good buy, thanks jsc

It's not as easy as adding the +12V rails together. Some PSUs have just 1 and some have 3 or 4. It's better to find the combined max +12V wattage and divided that by 12 to get your available amperage for the whole system. In this example you see a +12V1 25A and +12V2 20A but only 444Watts combined +12V which works out to 37Amps.

And then you have budget PSUs that show an inflated wattage such as 500W PSUs where the 500W is a Peak rating and not Continuous rating which might make the PSU a 450W continuous model.

That Corsair 550VX has just a single +12V rail although its 41Amps strong.

Thanks for the extra info, many thx

sounds like the single rail is a better choice here

Found the 550VX from a UK seller, will go ahead and buy it later  

As i think and understnd more about PSUs i realise that i have seen syphtoms of power shortage on my comp, sometimes the hard drive doesnt startup properly frist time and the screen can freeze other times, but it only happens about once a month. I would alwas work properly after a reset so never bothered me too much

Hopefully this will stop these problems arising

 

I asked because we have a lot of El cheapo Colorsit PSU in the Indian market...