Minecraft server. Please compare following specs:

[Guest]

Id like to get some input comparing the following. (Im not looking for money saving advice, or any different hardware advice, Its a strict choice between the following, because of personal reasons - availability)
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Currently the server is on Dual Xeons E5620s 20GB Ram. (2.4Ghz)
Im looking to change to Single Xeon E3 1280 16GB Ram. (3.5Ghz)
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I barely use 12GB max on my server so Ram shouldnt be an issue.
Im just curious about the CPU change. Would it be a decrease in performance or an increase in performance? Seeing as minecraft cant really take advantage of dual Cpus im assuming i would see a performance boost going to the new E3 1280 sandy bridge. Input please?
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Ps: I run on a 1gbit/1gbit port so bandwith is no issue.

 

[brythespy]

Both are good and you should switch to the single
Mine is run off 2GB and 3.2Ghz with 20 ppl at max no1 still complain about lag [i ask alot]

The server only uses around 800 -1GB ram so your server must be massive for it to use 12GB