Well Twinmos 3200 uses winbond chips, and often will run at the speeds yours is. (mine is)
It's likely but not guaranteed as those speeds are not stock. £44 for 512mb
Or you could get mem guaranteed to 2-2-2-5......no worries apart from the bill on that one. £77 for 512mb.
the choice is yours.
http://www.komplett.co.uk/k/kl.asp?bn=10529
hope this helps