You're right, I probably had the mem underclocked or perhaps it was unstable. I have some new numbers for project 2652 under Windows:
Stock @ 1.9ghz, 1.2V, RAM@800mhz: 663PPD (77W or 8.6ppw)
OC'd @ 2.71ghz, 1.3V, RAM@773mhz: 900PPD (112W or 8.03ppw)
Vg, this is why certain decisions were made during my purchase, along with the Seasonic Kill-A-Watt device.
1. The 4000+, no matter what final FSB I settle on I'll still be running 200MHz faster than a 3600+
2. The stock AMD heat sink is a good safe place to start practicing my lapping skills, which I currently have zero experience but want some. The retail box approach suggest less of a chance of bent pins, which would drive me nuts.
3. The Corsair DDR2-667 CAS 4. OC's like crazy (I suspect it is physically no different than the 800MHz version of the model.) I realize I may not be able to set the memory frequency as you encountered so I can set this memory as DDR2-800 and at some FSB's it will run below 800MHz, somewhere in the 700+ range, which this memory can do standing on it's head and still at CAS4.
4. Gain some AMD and Linux experience as well.
It include the real speeds memory will run for each processor speed.
The one thng I hate about performance graphs is they never include folding. I would a standard of WU types and the amount of time it takes to complete them as a measure of performance.