Might get my hands on a Dell Precision Worksation 530 (1.7GHz XEON, 2x 256MB RD RAM) soon. Will let you know how it compares with my current machine (P4 Northwood, 3.4GHz, 2x 512MB DDR low latency). Hopefully I'll be able to get another CPU and some more RAM for the Dell, but I think it'll be as scarce as hens' teeth, especially the RD RAM. Hoping to use it purely for rendering.