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Is my power supply good enough?

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So yeah I'm going to be getting a new video card (going from a GeForce 7900 to a 7950).

These are the video cards I'm looking at:
EVGA 512-P2-N635-AR Geforce 7950GT KO 512MB 256-bit GDDR3 PCI Express x16 Video Card
EVGA 512-P2-N637-AR GeForce 7950GT 512MB 256-bit GDDR3 PCI Express x16 HDCP KO Superclocked Video Card

The only thing I'm wondering about is, will my power supply be up to it? I really don't know much about power supplies, so if anybody reading this knows what they're talking about, your input would be greatly appreciated.

The hardware I'm currently running is"

Power Supply----Antec TruePower 2.0 550W Power Supply
Motherboard------ASUS A8N-SLI Premium Socket 939 NVIDIA nForce4 SLI ATX AMD Motherboard
CPU-----------------AMD Athlon 64 X2 3800+ Manchester 2.0GHz Socket 939 Processor
RAM-----------------Geil Value Series PC3200 1GB(512MBx2) DDR-400MHz Dual Channel Kit
Video Card---------eVGA Geforce 7900GT 256MB GDDR3 PCI Express x16 Video Card
DVD/CD Burner--SONY DVD Burner Black IDE Model DW-D26A BLK
2 x Seagate Barracuda 320GB 7200 RPM 16MB Cache SATA 3.0Gb/s Hard Drive
1 x Western Digital Caviar SE 320GB 7200 RPM 8MB Cache IDE Ultra ATA100 Hard Drive
1 x Western Digital Caviar SE 160GB 7200 RPM 8MB Cache Serial ATA150 Hard Drive
1 x Western Digital Caviar SE 80GB 7200 RPM 8MB Cache SATA 3.0Gb/s Hard Drive
Case Fans
2 x Thermaltake A2368 120mm Case Fan
3 x Antec Tricool 120mm Case Fan

BTW, this is a post I made in my thread in the Windows XP section but I feel I'll probably get better responses by posting this in here.
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    motto - Just get-er-done

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More important than how much power you have ( the 550 watt should be enough) is if you have enough 12 volt lines to handle the power. If you have 2 12 volt lines pulling 18 amps you should be OK. Why you have 5 hard drives i have no idea and you may be causing all of them to run in ATA 100 mode. The 5 drives will pull 125 watts and a single 18 amp 12 volt line is 216watts. The 2 video cards may pull 140 watts so its Ok there too. I calculate that your peak will be around 460 watts.

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Well thanks for your help with this. I'm not actually adding another video card but replacing my current one. But that just means that I'll have even more power in reserve. Thanks for your help with this! How would I be causing the hard drives to run in this mode, is it something I can change or is that just the way it is?
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