Need Processor Help!!!! Please

[sega4life]

I need help with picking 1 of 2 processors, please read below.

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I got a free Dell Dimension E521, I upgraded the Processor to (AMD Athlon 64 X2 4400+)

This link is to the PC specs

Here's the 2 Processors I have in mind

I want the 6000+, but I need to know this PC can or will accept it?

Found this site and it says the 6000+ will work, even the 6400+, but I need a second opinion.

 

Notes:

4gigs of ram (3.25 usable)

I'm upgrading the power supply today or tomorrow to 450 or 500, atm it's 305.

Have a 1gig Radeon HD 4650 Video Card, and it needs the extra power of the new power supply.