Other World Computing (http://www.macsales.com) has announced multi-channel OWC PC3-8500 ECC DDR3 1066MHz and PC3-10600 ECC DDR3 1333MHz Memory Upgrade Kits up to 64GB for the new Mac Pro models.
The kits are offered in 2GB, 4GB, and 8GB matched sets with a 6GB Set starting from US$207.99; individual modules also available from $69.99. OWC memory modules are designed to meet, if not exceed Apple Design Specifications, including use of Apple required thermal sensor EEPROM, JEDEC board design, and chip co