> Kodel tu rimtiems darbams renkiesi buitiny kompa... 
> geriau pasiimk su 1x XEON'u ir tiek...

Nepaisant to, kad mizernu papildomu skirtumu yra, bet grubiai
i5=Xeon E3-1225 (arba E3-1220 -2MB_cache + GPU), i7= nuo Xeon E3-1230 iki E3-1290.. 
techniskai tie patys SandyBridge tik su ECC palaikymu..
http://en.wikipedia.org/wiki/Sandy_Bridge#Desktop_platform
http://en.wikipedia.org/wiki/Sandy_Bridge#Server_platform << zr. E3-12xx arba zr.:
http://en.wikipedia.org/wiki/List_of_Intel_Xeon_microprocessors#.22Sandy_Bridge.22_.2832_nm.29

Tech. skaiciukai:
i7 vs Xeon: http://ark.intel.com/compare/61275,52214,52213,52276,52278,52277
i5 vs. Xeon: http://ark.intel.com/compare/52210,52209,52207,52270,52269

Pagal kainas geriausi variantai: E3-123X, E3-124X, taciau..
su Xeon nera "K" versijos, t.y. turbintis aukojant "K - does not support Intel TXT, Intel VT-d, vPro"..

Sick performance butu su 2xE5 Xeon'ais, kurie pasirodys ~2012-balandi?..
Bet.. 8C/16T kaina labai kanda.. 6C/12T dar dar.. bet irgi nepigu..

812$=2x406$ uz 2xE5-2620 2.0GHz/6C/12T/15MB
3104$=2x1552$ uz 2xE5-2670 2.6GHz/8C/16T/20MB
2CPU matkes irgi pakainuos..

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Is dabartiniu 2CPU Xeon'u:
http://en.wikipedia.org/wiki/List_of_Intel_Xeon_microprocessors#.22Westmere-EP.22_.2832_nm.29
1102$=2x551$ uz 2xXeon_E5645 (2.4GHz/Turbo/6C/12T/12MB) << i-Core pirmoji karta (iki SandyBridge)..
774$=2x387$ uz 2xXeon_E5620 (2.4GHz/Turbo/4C/8T/12MB) << i-Core pirmoji karta (iki SandyBridge)..