E 7520 Board Cpu question

I have 3 servers with E7520 Board
1 * X346
1 * EdgePower 2850
1 * DL 380 G3

i want to know which cpu gives best performance and has highest cache which compatible with this boards
3XLcomAsked:
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PowerEdgeTechIT ConsultantCommented:
Call Dell for a complete list of validated and supported part numbers.  As this is not published anywhere that I know of, you will need to contact Tech Support.  800-456-3355 ... call is free whether in or out of warranty.
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PowerEdgeTechIT ConsultantCommented:
PE2850:

Processors:
Up to two single-core 64-bit Intel Xeon HT processors at up to 3.8GHz, up to 2MB L2 cache.
Up to two dual-core 64-bit Intel Xeon processors at 2.8GHz, up to 2MB L2 cache.

Note:
If the front of your system chassis is labeled with a "II," your system is upgradeable to the Dual-Core Intel Xeon 2.8 GHz Processor with 4 MB L2 cache.
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3XLcomAuthor Commented:
my poweredge 2850 II but how should i be sure that it is ok ?
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3XLcomAuthor Commented:
Thank you
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PowerEdgeTechIT ConsultantCommented:
No problem.  You probably already know this, but make sure you update your BIOS and ESM before upgrading your processor, as most BIOS revisions add support for various processors or for various features.
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