Do I need a new PSU?

I am upgrading my GPU in an attempt to get another year or two out of my old computer and wanted to know if I need to upgrade my PSU too.

Current Build
Intel Core 2 Duo E6600 Conroe 2.4GHz LGA 775 65W Dual-Core Processor BX80557E6600
ZEROtherm CF900 92mm CPU Cooler

Mother Board
ASUS P5B Deluxe LGA 775 Intel P965 Express ATX Intel Motherboard

OCZ Platinum Revision 2 4GB (4 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model OCZ2P800R22GK

Graphics Card (new hasnt arrived yet)
EVGA 01G-P3-1371-AR GeForce GTX 460 (Fermi) FPB EE 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card

My old graphics card was a
EVGA 256-P2-N624-AR GeForce 7900GS 256MB 256-bit GDDR3 PCI Express x16 SLI Support Video Card

My current PSU is a
Antec NeoPower 550 550W ATX12V SLI Certified CrossFire Ready Active PFC Power Supply
3 answers Last reply
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  1. The new GeForce GTX 460 will draw a maximum of 13.3 Amps from the +12 Volt rail.

    Your Antec NeoPower 550 power supply unit is able to provide 18 Amps from each of the three +12 Volt rails or 54 Amps combined. That will leave you 40 Amps on the +12 Volt rail(s) to power the remainder of your system.

    Your current PSU has more than sufficient capacity for the new graphics card.
  2. Yes,a GTX 460 is a great upgrade from 7900GS but your CPU may bottleneck it(especially at resolution under 1080p)
  3. No problem.

    GTX460-1gb is a nice jump. It requires a 450w psu with 24a on the 12v rails. Your Antec has plenty to spare.
    As a side note, the maximum output on a psu is not the sum of the 3 18a rails(52a). It is normally somewhat lower, in this case, it is 42a, which is still plenty.
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