and what's the processor ?

So the same Xeon, Opteron or Itanium2 blades as the bigger enclosure, and it takes the virtual connect blades at the back just like the bigger enclosure. I had a read through the QuickSpecs at; http://h18006.www1.hp.com/products/quickspecs/12790_div/12790_div.HTML

just to see if there's a catch but I can't find one!

so from zero to 8 x dual-proc quad-core 3.0Ghz Xeons or 4 x quad-proc quad-core Xeons and a range of options inbetween.