5850 has a TDP of 150w, same as 4870.
Anandtech showed the 5850 using less power than a 4870 though... a good 20-35w less.
5850 is close to a GTS250, pulls ~10w more.
http://www.anandtech.com/video/showdoc.aspx?i=3650&p=13
Edit- 5850 is ~9.5in
http://www.guru3d.com/article/radeon...ew-crossfire/3
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