I can't find information about ECC memory support for IBM 6791-KAG
(ECC 133 SDRAM). (It's much cheaper
than pc133). There is nothing about it.
That's all I've got: http://www-307.ibm.com/pc/support/si...IGR-41234.html
There is also a version of 845 that is used with DDR memory, but
I don't think this is for your motherboard (the IBM page does
say SDRAM and not DDR SDRAM).