Like why ask if a 400 watt power supply is good enough if it clearly states on the box 450 watt power supply minimum!
It's not that cute and dried. There are many good 400W (and even some 350+W) PSUs that could handle a 4850 video card. It all depends on the actual power the PSU can provide and the total power draw with the 4850 in that system. An E2180 CPU will draw a lot less power than an OC'd Q6600 for example. Some people will have several HDDs and optical drives while others only have one each.
It was a fair question.
Here is the 4850 power draw with a Core2 Extreme X9650 3.0Ghz CPU
And It was tested by [H]ardOCP and passed every test
The Bottom Line
With the Corsair TX750W, Corsair has set out to raid the high end market and with the TX750W they have fielded a good candidate. The TX750W makes a very good follow up to the HX line with amazing 12v voltage regulation, good efficiency values, great build quality, good DC output quality, and quiet operation. As always there is room for improvement as we saw less than stellar regulation on the 3.3v rail, a bit noisier than previous Corsair unit’s DC output, and some cooling that could use a bit of tweaking. However, coming in at a lean $179.99 at Newegg this unit is prize booty.
The Corsair TX750W represents a solid PSU value for those that need a lot of power. It is a good power supply, just not a great one.