Wow impressive!
I think I have RAM just like it but one 512mb module and one 256mb module, both are Twinmos PC3200 2.5
the smaller one does about 250MHz but won't do 2-2-2-5 over ~180MHz and the bigger wont do more than 228MHz. Means unfortunately I don't get more than PC3700 3-3-3-8 in this rig.

You sure got lucky there if they are non-twisters m8 perhaps some very old newly-rediscovered cache of BH-5 or good TCCD(how much did you pay btw?).