Dell does use good PSUs and tends to rate them for continuous rather than peak usage like most. The 6850 might work in that system without a PSU upgrade but you would be pushing it...
I believe your computer should be able to use any ATX PSU if you want to upgrade it. This would be a good choice for $49.50 and easily handle the HD6850 or better cards; http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Where is a higher PSU recommended? The CX500 can handle what he wants easily with as much overclocking as he wants. The Antec PSU I linked above is both better and cheaper though. TX650 is just pointless overkill IMO.
It is an overkill I know, but he don't have to upgrade his psu again and again in future.
And I know that Dell psus are rated for continuous power but do you have any idea about the amps on +12 v rail?
This was the reason why I thought a PSU upgrade will make sure that nothing goes wrong, and I am against pushing PSU to limits as it can get unstable depending on the temprature
So just to make sure, I can infact replace the powersupply on the dell vostro but i have to find one with similar dimensions?
I've been looking all over the internet just to be sure but everyone says a different thing..well, i dont know why Dell doesnt have their own replacement PSU's with higher supply for their systems.
thanks for the help