Graphic Card for 350W PSU

So one rail supplies 144W, and the other 218W, but the max continuous load of the sum of both is only 300W. Could be worse I guess. Anyway a Radeon 4670 is your best bet. You may be able to put in a 4770 (it's better than the 9800 or 9600GT by far), but I think that would be pushing it. I doubt your PSU really can sustain 300W for too long as it's probably not the best quality. Not only that but since it's aged a bit it will be handle even less of a load.

The Delta 350w power supply that came with your Dell is a very good quality power supply. The Antec Earthwatts series are manufactured by Delta now, they used to be manufactured by Seasonic. The HD4670 is the safest choice, but either the 9600GT or the HD4770 shouldn't cause you any problems. Make sure the card will fit, measure carefully(dual socket?) and buy accordingly. Also download a hardware monitor and keep an eye on your temps(Dells have pretty poor cooling) compare your stock set up temps now and compare them to new temps after adding a GPU. Good luck.

All cards 512mb. HD4670 uses 64 watts at load, 4770 uses 80, 9600GT uses 70, 4830 uses 121

I saw a video on you tube and even a 9800Gt can fit. My question is can a 9600GT be handled safely by my PSU because i don't want to stress the PSU too much. Just around 5-10 W below the limit at full load is ok for me. Suggest me a good one and i can afford a 9600 GT or HD 4670 but not a HD 4770. It is too costly here in India.

But when comparing the 9600GT and the 4670, the 4670 is efficient and consumes less power but is weaker than the 9600GT...
So if you want the powerful card of the 2, then the 9600GT is the best option...but get the DDR3 version and not DDR2...

Well the ATI alternative for the 9600GT is the 3850 but it performs similar to the 4670...And the 3870 would obviously be costlier...

^ For how long have you been running that PSU ? If it is 2+ years old, then get the 4670 if you had bought it recently then get the 9600GT...

It is quite new PSU only 7 month old. I will go for a 9600Gt. Thanks.

The recommended amperage is 26A in the 12V rails...but they generally give increased values than what is actually required for the card to work...
But still it is a close call as you are running a Quad with that PSU...And don't even think of overclocking your CPU...It would most likely kill the PSU...
Instead of saving money for the CPU cooler, save it for a good power supply...that is a better investment...
If are experiencing high temps,. then reapply good amount of thermal grease like the artic silver 5 or MX-2...they should atleast bring temps down by 2 or 3 degrees, maybe even more...

10/10 for that. Great info. Now i am pretty sure mine can handle a 9600Gt but i will think of my PSU and will go either to a HD 4670 or 9600Gt. Do you think that my temperatures are fine?????
55 Degrees at idle and 65-70 Degrees on full load.

Room temperature is around 40 Degrees here. Take a 33 Degrees for minimum

I didnt apply any thermal paste. It is direct from factory.
[I opened the side panel once but only for a diff of 2 degrees. So closed it fearing any of my cousins would break a piece out of it]--- Crap. Leave it.
It is slightly ok now. Idles at 52.

Hey can this happen???? Can
+12Va--- 12A and +12VB---- 18A combined of 25 A on 12V rail
handle a system like mine with a HD 4770 or 9600GT.

I believe you have already been advised that the answer is "Yes."
Considering that you only have an 8300GS now, you are likely to be entirely satisfied with a HD4670, especially at your stated resolution. The 9600GT will be a little better. The HD4770, if you can find one, will be stronger still.