Can the board support 1333? If your board can support that CPU it should go that high.
My current system is a dell optiplex 745, Small Mini Tower, Service Tag H31YPC1; it has a Pentium D, 3.4 processor. According to Dell's specs for my system, it supports the Intel® Pentium® D 800MHz FSB Socket T with Dual Core technology XD, EM64T, 2x2MB L2 cache, EIST, and VT on 950/960 (900 series); it also supports the Intel® Core™ 2 Duo 1066MHz FSB Socket T with Dual Core technology XD, EM64T, 2MB and up to 4MB L2 cache, EIST and VT (E6000 series). ). I’m interested in finding out if a FSB mismatch will work at the lower of the mis-matched speeds, will not work at all, or will cause the system to over-heat and crash.