Do I need a new power supply

Hey all,

This summer I have been slowly upgrading my system to a point where it will run the latest games etc.. My rig will be:

AMD Athlon 64 3800+ (skt 939)
Asrock 939 Dual Sata motherboard
2 x 512mb RAM
ATI Radeon X1800XT 256mb
1 x Soundblaster Live! card
1 x CD drive
1 x DVD drive
2 x 40gb hard drives
2 x 92mm fans
1 x 120mm fan

At the moment the only thing not added is the X1800XT (I am currently working off a Radeon 9600XT!). However, I have noticed that my fans shift a different amount of air depending on which 4-pin connector they are plugged to (the fans are Antec Tri-Cool). This has lead me to suspect that my power supply (a thermaltake purepower 480w butterfly), will simply not be up to the task of powering my machine after I have added my new graphics card.

As a replacement I have picked out an Enermax Noisetaker 535W. However, I know absolutely nothing about PSU’s and so I was wondering whether people could give me their opinion on:

-whether or not I actually need to replace my power supply (or is the thermaltake ok)?
-Is the Enermax really any good and if not are there any alternatives (I only picked it out because it had some good reviews – but then again so did the thermaltake!)?
-Is there anything else I need to know?

Thanks for your opinions – really need some help deciding this! :?
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