Join Date: Dec 2012
Location: Sparks, Maryland, USA
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Haswell-E is a long way off, Q4 2014 at the earliest - there's no definite plan for DDR4 on Haswell though, even Haswell-E. You might need to wait for Broadwell before you can get some DDR4 action.
If you want to upgrade, do it with IB-E and enjoy it. Haswell-E is only going to be 10-12% faster than IB-E with the same number of cores. You can get a 8 core X79 platform right now if you don't mine paying for a $2000+ E5-2687W Xeon. =)