I need to update up to 4 CPUs with the maximum cores and frequency a DELL R810 server, it has 2 x Intel Xeon X6550 @ 2.00GHz, . Can I add 2 CPUs of the same type or should I replace them with one of the following? E7-2870 2.40GHz 130W 30M 10 6.4GT/s E7-2860 2.26GHz 130W 24M 10 6.4GT/s E7-2850 2.00GHz 130W 24M 10 6.4GT/ E7-4870 2.40GHz 130W 30M 10 6.4GT/s E7-4860 2.26GHz 130W 24M 10 6.4GT/s E7-4850 2.00GHz 130W 24M 10 6.4GT/s E7-8870 2.40GHz 130W 30M 10 6.4GT/s E7-8867L 2.13GHz 105W 30M 10 6.4GT/s E7-8860 2.26GHz 130W 24M 10 6.4GT/s E7-8850 2.00GHz 130W 24M 10 6.4GT/s I need the highest power that supports and number of cores