WHS CPU Transcoding question

[jetracer]

I am building a WHS server and was wondering what is the lowest cpu i can get away with to transcode video on the fly to my ps3 using ps3ms. both for AMD and INTEL.

I am buying a norco 4020 and some day will eventually fill that bad boy up with 20 hds. Thanks in advance

 

[pjkenned]

What are you aiming for in the lowest CPU? Lowest performance? Lowest price? Lowest power consumption?