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Originally Posted by cj2112
From what i read, the biggest difference between the two is how much memory the processors can support, and the opteron can be used in 1, 2, 4, or 8 processor set ups where the 64 can only be used in single processor setups. If your not going to run over 4 gig of RAM and not going to be running multiple processors (I can't really think of a reason a gaming rig would need more than 4 gig or more than one higher end processor), then go with the 64
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you are thinking of the socket 940's, he's looking at the socket 939. the two are COMPLETELY different.
the 940's CAN support more than 1 processor.
140-154 - single core, 1-way (meaning 1 processor only)
165-180 - dual core, 1-way
240-254 - single core, 2-way (meaning 2 processors)
265-280 - dual core, 2-way
840-854 - single core, 8-way (meaning up to 8 processors)
865-880 - dual core, 8-way
the 939's are a different story. they only come in the 1xx series...so only one processor per system. these opterons work on MOST 939 boards, but you'll probably need a bios update.
also, the 939 opterons also support regular pc3200 memory, while the 940's require ECC memory. so, with the 939 opterons, you'll be getting a max of 4gigs.
but...back to the question:
the socket 939 Opteron 165 is the best equivalent to the x2 3800. they have two differences.
165 - 1.8Ghz, 2x1Mb Cache
x2 3800 - 2.0Ghx, 2x512Kb Cache
the two perform just about the same though.
the only real reason to go for the 165 is if you are looking to overclock. these guys are a beast, and can frequently hit 2.6+Ghz, which would be like having the FX-60 (dual core, 2.6Ghz, 2x1Mb). you'd have a $1000 processor for a fraction of the price.
i would definately go dual core for a new system.