Welcome to the forum!
Unfortunately, a Core Duo will not work in board 441696-001 as far as I know. Everest, PC-Wizard, and CPU-ID all report "i943/940 GML" as the North Bridge on boards 441696-001 and 445605-001. This is technically correct as they are in the same family (hence the "/" meaning and/or). Unfortunately, it is misleading.
Board 441696-001 is equipped with i940 GML. I have visually inspected mine and know this for fact (if I could take a clear picture of it, I would, but the print is so small. I needed a magnifying glass to make it out). i940 GML seems to support ONLY single core, Yonah based (32-bit) CPUs. The max I have gotten working is a Core Solo T1350 (one core, 1.86 GHz, 533 MHz bus).
That being said, I was not able to pull together funds to test a Core Duo PERSONALLY. Based on what OTHERS have said, I gather they do not work. All the information I've found elsewhere and in posts here from what I remember suggests that even Yonah based Pentium Dual-Cores and Core Duos (which are the same core, just different amounts of L2 cache if I recall correctly) will not boot on 441696-001.
If you have the money to spare and want to TRY a Core Duo (they're really not that expensive at this point), I would say that's your call. Worst that happens is it doesn't work and you have a chip to sell. The information I've seen and worked with so far says the Core Solo T1350 is the top you can get for that board.
I hope that helps answer your question. Corrections are always welcome. Being wrong just means you know more now than you did before. I love being wrong.