Best instruction set to use SSE3 or SSSE3 for Lunatic's optimized?

[cooldrum3]

Ok, I have a work machine that has been sitting around so I'm using the extra flops to crunch...of course.

Specs:
Core 2 Duo E6750 2.66Ghz
4 GB RAM
2x Quadro NVS 295

So, the E6750 (Conroe) supports both SSE3 and SSSE3, and I was wondering which would yield the fastest crunching times. Has anyone done a comparison on this? I know SSE4.1 is a real boost, a pity it doesn't have it!

PS- Its also running Win7 64bit

[eaglescouter]

I always use the most advanced instruction set available to the CPU, thus I would optimize for 64 bit SSSE3. However I have not done any testing to prove that my method provides the best results.