Quote - when an SSD is capable of 150 Mb/s of data transfer and a typical two drive Raid 0 and only do about 30 Mb/s of data transfer and the temp file .exr is the target of the render dont you think moving that file to a faster drive will lead to faster render?SSD are almost as fast as writing to memory

How large is the temp exr file that's being created? Depending on the resolution, they just a couple dozen MB in size or even less, so in most cases that would take 3 seconds or less even on a laptop hard drive (my laptop's hard drive measure about 20MB/s).  

Quote - My last system was a Single Q9550 Quad Core with 8 gb of RAM ... An IDL scene took a while to do... the new set-up is over twice as fast but the limiting factor seems to be the file that poser is writing that render file during the render...

What makes you so sure that writing the file is the limiting factor? How large is that file?