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.

i would get better than what you have in mind, i would at least spend a $100

You basically came into possession of a free obsolete PC. I really wouldn't bother trying to make it work for gaming. Instead, part it out on eBay and put the money toward something modern.

No, this is the only PC I have now, and it plays Star Trek Online Nice, and BF:BC2 Good, and ALL my Steam games amazingly, so it's a perfect gaming rig for me.

The Processor will give it the power I need to push Star Trek Online to Great and BF:BC2 to Nice.

Your video card's fairly weak, and will be very limiting for gaming as well.

You should theoretically be able to support anything up to AMD's most recent CPUs on that motherboard, but OEMs like Dell, HP, and what have you like to do funny and limiting things with their BIOSes, so there's no guarantee that anything would necessarily work overly well.

That's your prerogative, though I find it hard to believe that an old dual core and a Radeon 4650 can run BF:BC2 at anything besides low settings at a playable framreate. That game brings modern mid-range rigs to their knees at high settings.

Seriously though: You're running a 32-bit OS with DDR2-533 RAM, an old (hot) dual-core CPU on an obsolete chipset, a video card that wasn't any good for gaming even when it was released back in 2008, a slow 320GB HDD (at best), and an underpowered PSU. Right now you're being bottlenecked at least as much by your GPU and RAM (not only because DDR2-533 is slow and obsolete, but also because 32-bit OSes need to share 4 GB RAM between system and VRAM) as you are by your CPU. A new copy of Windows 7 Home Premium plus a Radeon 4850 and a new PSU will set you back $250+ right off the bat, and then you'll still be bottlenecked by your old CPU, so you'll need a decent Socket AM3 CPU and complementary mobo, and then you might as well upgrade your RAM too... and suddenly you need a new system entirely. See where I'm going with this?

So you can either spend $150 now on a new CPU + HSF + PSU to keep an old system on life support for maybe another year at most while playing your games at low settings and then be forced to upgrade anyway, or you can invest $600ish now into a new midrange rig that'll blow that one away and let you enjoy your games at pretty high settings without worry of unplayable framerates.

@ jefforange89: I doubt the mobo is Socket AM2+, so he'll be limited to older Phenoms at best.

No, with BIOS updates even AM2 motherboards can support AM3 CPUs.  Just you're limited to lower HyperTransport speeds, and of course DDR2.

But this is Dell, so I couldn't really count on such a thing.

I would suggest a graphics card upgrade first. You can pick up a GDDR3 HD4870 for $70 or an HD 5670 for $100 which would be a better upgrade than spending that money for a slightly faster processor. Just make sure it isn't one of those slimline cases.

Aside from that I see no reason why those CPUs would not work.