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The Trigem computer bit is the company name, the WMT478/NWD sounds more like a format, the BIOS info does not seem to add anything.
If you can identify the exact model number (and revision) you can find a lot even if the manufacturer isn't helpful. A quick search in Google will lead you to forums etc where others have mentioned that specific motherboard. Also, the manual may have jumper setting info on items like the multiplier. You can work out the max speed it supports.
To be honest my personal opinion is that it's not worth upgrading just the processor. I doubt you will see any noticeable difference in performance.
Processor Family: Pentium 4 (Northwood, Willamette)
Note: So it may not take later 478 CPUs like the Prescott.
Chipset: Intel 82845GL
Pretty old chipset lacking many modern features. A new board could cost you $50-$100 and give you firewire, USB 2.0 etc. in addition to features you already have like the RJ45 (network card).
Video RAM Size: either 1-16MB or 1-32MB (Shared memory architecture similar to the Intel 810/810e chipset)
Severely limits gaming but also "robs" the rest of your PC of badly needed RAM.
Also, the "L" at the end of the chipset suggests it doesn't support 533 MHz FSB processors.