You do not need an 860W PSU to power a 9400GT. Depending on the rest of your system, I wouldn't even upgrade the PSU if you're just going to throw a 9400GT in there.
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CPU: AMD Athlon 64 x2 5200+ @ 2.6GHz
GPU: Zotac 8800GT AMP! w/ Akimbo 740/1800/2000
PSU: 450W Corsair VX450 Monitor: Acer 22" X223W
Memory: 4GB DDR2 PC2-5300 HDD: 320GB HDD
Speakers: Logitech 5.1 X-540
3DMark06: 9521 3DMarks
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