I want to upgrade my mac pro from 4gb (4X1gb) to 12gb or 16gb of memory. I know this seems excessive especially since I use the 32bit kernel and 32bit XP, but that's my problem. I don't need and can't afford more ECC RAM... So I'm putting mine on eBay and picking up 12gb (to start) of "normal" PC6400 DIMMs. I'd like to know if these would work: http://www.newegg.com/Product/Produ...27248&cm_re=pc6400_4gb-_-20-227-248-_-Product I see that there are 1.8V and 2.1V DIMMs. Do I want one and not the other? Are there known issues with non-ECC unbuffered memory in mac pros beyond the occasional error?