Best recommened Graphics card

[Warhound]

8800 GTX TDP = 145 Watt
6850 TDP = 127 Watt

So as I said in the previous post ,if your current system is rockstable (under load) with the 8800 GTX..it should be just as stable with a 6850 since it actually has a lower maximum powerdraw.

Dell is known to rate their PSU's very low, but they actually manage to get very close to their rated power. This is the opposite of most PSU's ,which might claim 500W but actually buckle as soon as you ask them to provide a stable 400Watt.
Dell seems to use a rating that can be supplied reliably and stable while most PSU brands seem to rate the peak output, not what the product can push out stably 24/7


edit: if this is the review you checked : http://www.bit-tech.net/hardware/gra...i-1gb-review/8
You'll see they list the system with a 6850 as drawing less power from the socket than most others (229W).
Also the system used has a higher wattage CPU and a 1000W PSU which won't be anywhere near peak efficiency at such low load.

Now I'm not saying your system is guaranteed to run a 6850, but I think the chance is pretty good it will...and if it doesn't just send the thing back within 7 days and get a full refund.