Well, there's some new data about the place. Divi8, who's a member at OCAU picked up a "production" block from me yesterday.
He is seeing a 6C drop over a Silverprop Cyclone 5 w/6.5mm base when running Folding@Home on an 1850MHz/2.00v AthlonXP.
My own results saw a 6C drop for an AthlonXP @ 1925MHz/2.15v between my production block and a Silverprop Cyclone 5 w/6.5mm base. I have the Cyclone 5/3mm based block here and it performs about 0.5C better than the 6.5mm based model for the same test. The C5/3mm block is one that is being sold most predominantly now.
Divi8 is seeing slightly better results than I expected, but he's using a different motherboard.
His thread with his results is here:
http://forums.overclockers.com.au/sh...hreadid=106836