nope 500W minimum, so I suggest getting a Corsair CX 600M since you NEED at least 50 to 100W of extra headroom.
But as per guru3d
260gtx consumes 182w as a maximum
, the HDD and the rest wont suffice with 200w(approx)?
(taking into consideration that it actually performs with 85% efficiency).....
am not just sure
but anyways thanks for yar suggestion mate !:D