E4g1e said: No. Not only the two sockets both physically and electrically incompatible with each other (in fact, LGA 2011 v3 CPUs will not even physically fit LGA 2011 v1 there is no LGA 2011 v2 socket at all nor vice versa), but LGA 2011 v3 requires DDR4 system RAM whereas LGA 2011 v1 can only use DDR3 RAM. The two RAM types are completely incompatible with one another, as well. Click to expand...
Hold on there what do you mean there is no 2011v2 socket at all because I happen to have a socket 2011 1650v2 processor for my workstation with the following specs: http://ark.intel.com/products/75780/Intel-Xeon-Processor-E5-1650-v2-12M-Cache-3_50-GHz and the my server has the following 2011 2603v2 with the following specs: https://ark.intel.com/products/76157/Intel-Xeon-Processor-E5-2603-v2-10M-Cache-1_80-GHz The DDR4 requirement of the 2011v3 is exactly at least one reason I don't think my 2011v2's would be compatible with a 2011v3 processor and the downgrade from DDR4 for the 2011v3 to DD3 for the 2011v2 is exactly why I don't think the either can be used in each others socket, but I did think I read that the 2011v2 could be used in a 2011v3 socket though and if that's true then why not vica versa if either is possible. The specs for the entire 2011v2 family for both the 1600v2 and 2600v2 are as follows and included in the same link: http://ark.intel.com/products/family/78582/Intel-Xeon-Processor-E5-v2-Family#@Server scharfshutze009 said: Hold on there what do you mean there is no 2011v2 socket at all because I happen to have a socket 2011 1650v2 processor for my workstation with the following specs:
http://ark.intel.com/products/75780/Intel-Xeon-Processor-E5-1650-v2-12M-Cache-3_50-GHz
and
the my server has the following 2011 2603v2 with the following specs:
https://ark.intel.com/products/76157/Intel-Xeon-Processor-E5-2603-v2-10M-Cache-1_80-GHz
The DDR4 requirement of the 2011v3 is exactly at least one reason I don't think my 2011v2's would be compatible with a 2011v3 processor and the downgrade from DDR4 for the 2011v3 to DD3 for the 2011v2 is exactly why I don't think the either can be used in each others socket, but I did think I read that the 2011v2 could be used in a 2011v3 socket though and if that's true then why not vica versa if either is possible.
The specs for the entire 2011v2 family for both the 1600v2 and 2600v2 are as follows and included in the same link:
http://ark.intel.com/products/family/78582/Intel-Xeon-Processor-E5-v2-Family#@Server Click to expand...
Actually, the e5 v2 Xeons use the LGA 2011 v1 socket. The LGA 2011 v3 CPUs have the same number of pins, but their pin assignments and mounts are different and completely incompatible. Also, the v3 and v4 CPUs require DDR4 RAM but do not support DDR3 RAM at all, while the v1 and v2 CPUs support only DDR3 RAM but no DDR4 support. | 
