3 servers in a single datacenter
8 GB DDR3 RAM
2 x 750 GB SATA-II HDD (Software-RAID 1)
Intel® Core™ i7-920 Quad-Core (2 processors, 8 cores)
Mysql 5.1 (5.5),
Large attendance, about 10 projects in total, according to three projects on each server. Projects tagelus Bitrix (most likely going to rewrite the whole of it and getting rid of Bitrix). On each server there is a big load.
How in your opinion, will the more efficient configuration, in which one server will perform the role of database server, and the other two to compile php code (or one for compile one for static and cached).