PC133 in a T21

[carbon_unit]

I recently got a good deal on a T21 2648-8AU.
It only had 128mb memory in it but I had two PC133 SODIMMs from my T23 laying around.
It had been pointed out here previously that the PC133 spec'ed ram would not work in the earlier T* series machines, so being the contrary person I am I tried them and it worked.
I put both pieces of PC133 ram in my T21 and it seems to work fine and reports 256mb installed.
I haven't stress tested it yet but it seems stable so far.
Will it be OK to leave it this way or can I expect problems?