Thanks for the kindly reply, it's a pity that not much info I can find for this one....I'll keep trying my luck :)
Yes, I found the MITAC 5033 and checked the image of the system board to make sure it has the socket. I'll looking for it on eBay or some other possible ways to get one in right...
I was watching LGR's channel and get interested into retro computer. Reading about the Thinkpad 315ed with CPU upgrade ability is really attracting me since I have some socket 7 CPUs laying around.
But a good condition 315 is kinda out of my budget from eBay, in my country there's not much...