Adding CPU Support to Mobo BIOS

I want to preface this by saying that I KNOW I am not taking the easy way out by simply getting different CPUs. I like projects like this, and I like doing uncommon things just to see if they can be done. What I am looking for is for references and info on HOW to do what I mentioned for the sake of doing it if it is in fact possible.


I've got a few MOBOs and more than a few CPUs at my disposal.

Motherboards:

One of the mobos is the ASUS NCCH-DL (not sure which chipset), the other is the Alienware X2 mobo (Tumwater chipset). Both take dual Xeons, and have 604 pin sockets. I believe both (deffinately the X2) use the the Nocona (single core), Irwindale(single core), something I am drawing a blank on(single core), and Paxville DP (dual core) processors. Both have 800 FSB. The expansion slots vary but they aren't especially relevant to this post. The Asus NCCH-DL uses an Phoenix/Award BIOS, the X2 uses AMIBIOS.

CPUs: (all socket 604)

A bunch of single core Xeons 2.4-3.2 Ghz (working)
2x 2.8 ghz Dual Core Xeons - SL8MA (working)
2x 3.33 ghz Dual Core Xeons - 7140N (not working)
1x 2.4 ghz Hex Core Xeon (haven't tried but I'm assuming not working)

What I want to do:

Apparently the only motherboards that take the 7140N and the 6 core CPUs are server boards that take that support up to 4 CPUs. I am building workstations. The CPUs fit the slots just fine, but they do not detect upon power on. the fans go on and the lights illuminate, however there's no post whatso ever. I suspect that it's because the CPUs are not supported in the BIOS. I would like to find a way to either modify, replace with a third party, or discover some sort of modular bios that will accommodate the CPU-Mobo combination.

My Current Thoughts

The cache is quite a bit larger than the normal processors that are used, and I've read that this can cause the the system not to post. I've also read that this can be remedied by an updated, modified or 3rd party BIOS.

I've recently read about American Megatrends' modular bioses - AMIBIOS8, APTIO, and Enterprise 64. I have zero experience with them, but think I understand them as bioses that replace the current bios and enable more options at startup, as well as more hardware compatibility. Does anyone have experience with these? Can they be used on the NCCH-DL motherboard, or only the X2?

I just want to make it work. I care less about how than I do about learning how every aspect of the BIOS works. If a modular solution will do what weeks of sorting through code will, then I vote for modular (I just don't know if one of these modular bioses will do what I want).

I've heard alot of people say on various internet forums that there are 3rd party bios venders, or people who write/modify them for approximately $80, but there are never any specifics. Does anyone have a link to a working web site I can check out? The only links I've found have been dead ones.