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#21
Passmark score for AMD Athlon 64 X2 Dual Core Processor 6000+ is 1674.
Passmark score for Intel Core 2 Duo CPU E4500 is 1324.
Passmark is a pretty good indicator of overall CPU strength.
http://www.cpubenchmark.net/midlow_range_cpus.html
That's a low-end Core 2 Duo. The mid and higher end models easily outperform the AMD.
I doubt if you'd notice the difference between them.
Personally, I wouldn't bother investing time or money in getting the AMD running since the machines are so close.
You might be able to rob some other usable parts, such as RAM. I didn't check---they may use similar RAM.
Other than that, I'd ignore uncle's machine, unless you simply want another complete and running PC for some purpose.