also your mention of xeons is quite ambiguous considering that there are xeons that can't be overclocked and that is the general misconception that they are not great for "gaming"
Intel by default release versions unlocked and locked, Nothing strange but I did not say it because I thought how it was locked, I sayed it because Xenon processors are thinking for running specially with 64bits and aplications. There are a misunderstanding concept about how all the games use this technology. When just a few games use it.
SOASE by example uses only one single core and if you do not use the large address aware tool, it will not use more of 2gb of ram, Really it will not use them but this tool will divide additional memory better for this old programs.
By this reason, a processor with a better speed by each core is better than a Xenon which it was thought for use all them.