I actually think that the modules should AT LEAST run at the speed they're specced at - and this is 500MHz in this case. Well they don't - at least not on Abit P4 boards which are among the top-rated P4 boards out there only rivalled by Asus. So it is a big let-down not to be able to run these modules on very popular boards.
What concerns me most is that
IMHO Tarinder did not test these modules properly. I buy them so that I can run sync FSB 250, Tarinder did not get them up to that speed but gave them an 8/10. That does not look like proper reviewing to me. He should at least have tried on a P4C800-E which is the TwinMOS reference platform.