Just to back this up, Intel locks the multiplier on their processors. So, no matter what the motherboard tries to set the processor up as, it will use a multiplier of 7.5 as 7.5x133MHz bus = 1GHz
So let us say the motherboard doesn't identify the processor, there is no possible way it will overclock it as 133 was the highest bus speed used for that line of processors. you will either end up with it running at 1GHz, 750MHz, or possibly 500MHz if that motherboard has a 66MHz bus speed. The latter may be likely as motherboards which cannot identify the CPU will clock it at the lowest possible speed assuming their architectures are compatible.
You might want to check your memory though, if it was paired with the Celly 400 it might only be PC100 in which case there is a chance it won't work with a 1GHz processor if it can't overclock to 133.
A similar situation to this is one which I had with my previous system (now my file server). There is a line of Athlon processors designed specifically for laptops, the Athlon XP Mobile. They use the exact same architecture as the regular Athlon XP, the only difference being they run at a lower voltage (this in turn reduces heat which is good for a laptop). However, people discovered that if you cranked the voltage up to what it would be on a regular XP you could get really good overclocks.
The point is, as these chips were only really designed to be used in laptops, motherboard manufacturers did not write the identifying info into the BIOS. So, when I installed the chip in my Abit NF7-S motherboard and booted, it booted as "Unknown CPU @ 800MHz." That is exactly what it says.
In actuality, the processor was a 1.83GHz processor. However, motherboard manufacturers do realize that processors will change after the production of the motherboard. So in their wisdom when a motherboard does not identify a processor it will use the lowest possible bus speed. In the case of this CPU it also does not have a locked clock multiplier so the motherboard automatically set it to the lowest possible as well. The result is that it booted the processor at 800MHz even though it had no idea what processor it was. I was then able to go into the BIOS and change the settings to what they really were and more (2.4GHz in the end, 2.5 wasn't stable)
I hope this little story will help you to understand that despite the fact that a motherboard may not know what a CPU is, that does not necessarily mean it cannot run it. Remember that BIOS is only software. For your motherboard to be able to run it has to be built into the hardware so no matter what BIOS you have it has the ability to run the processor.
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