2.08 Hours of CPU time per HCC task on my machine:
Core I7 920 (C0 stepping, initial release) Overclocked to 3.2 GHz. (stock was 2.66 GHz) Hyperthreading turned on. 6GB of RAM.

yeah i might try the gpugrid forums. i'd really like a way to configure boinc to only use the gpu for gpugrid tasks, and not use the cpu that should be dedicated to HCC. i don't know if you can dedicate a portion of gpu, i doubt it, but really not keen on the gfx card getting that hot.

now running at 3.4ghz, not made much difference over 3.2ghz, maybe just under 50mins a unit now.

not fussed on badges, just want to help out and make use of machines that are doing nothing for 8+ hours a night.

HFCC is more targeted on specific cancer.
HCC is rather basic research and so it is more comprehensive.

And GPUs are good at mathematchical operations CPUs are better at data analysis (calculacions with large amounts of data and a lot of conditions if and case type and so)

The HCC project researches and facilitates automated crystal identification systems to expedite this time consuming and costly procedure. The crystals can then be X-Rayed to identify the proteins molecular confirmation, which in turn helps scientists work out function and potentially find cures by looking at drug interactions, as so on. The HFCC is doing this last step!
Although crystal growth of proteins that are related to cancer may be the choice of the lab doing this, such crystal selection procedures could facilitate the identification of any viable protein crystal. So the refinement of this selection method could help in many areas of medicine and biology as a whole, not just cancer.
Anyway, both are good projects.

boincstats.com keeps statistics by CPU Type. I find it useful.
It will not help with the power consumption information.