Other World Computing (OWC) today announced the introduction of 512MB x 2 upgrade kits of proper Apple-Qualified Fully Buffered DIMM (FB-DIMM) 667MHz DDR2 72 Bit ECC (error correcting) memory for the new Apple Mac Pro Quad Xeon for customers who prefer to add matched sets 1GB at a time. OWC 1GB Apple-Qualified FB-DIMM kits for the Quad Xeon are offered for as low as US$248.75. A cash-back rebate of up to $350 per set is available from OWC for the trade-in of Apple factory memory.