Yes Bill, I was thinking that, and I will look for some with clock rate of 133.
However, as Kfingers says ,the owners manual says that 100 or 133 will work.
I spoke to Yamaha UK Technical help and they could not see why these cards wouldn't work unless they were faulty.They said it was preferable that DIMM cards conformed to JEDEC standard but that was all they could advise.
I then called Kingston Technical Help who confirmed that all their products were to JEDEC standards.They said if I could give details of computer or mother board they could recommend suitable DIMMS.I explained that it was a keyboard and as Yamaha don't give these details that was not possible. They were trying to be helpfull but wished me luck :-)
I re-checked the cards and cleaned contacts, re-installed and this time the 'Property' screen showed no memory at all in any of the boxes and locked up on that screen !
I had also looked at the Yamaha.com list which shows several 100 clock rate cards
but seems out of date as things move on.
Does this mean that their motherboard used was abit outdated ? ( I had difficulty in locating one of their HDD recommended models but finally obtained it, just hope it comes up to expectations )
I think that if Yamaha offer add-on accessories they should give more specific details about module types ,keep their lists up to date and confirm that 100 clock rate cards will still work.
I now have to return these cards for testing,and negotiate changing them for 133/128Mb cards but with no idea whether those will work !
The nearest I can find on my retailers list to those on the Yamaha list is Crucial CT16M64S4D75...128 Mb. The Yamaha quotes CT16M72S4D75 . Not sure whether the '64'or '72'figure is critical.
Wish me luck guys as that what it seems to depend on ;-)
Derek