240-Pin DDR2 FB-DIMM ECC Fully Buffered DDR2 667 (PC2 5300) Server Memory Model
http://www.newegg.com/Product/Product.aspx?Item=N82E16820146588
$125 for both sticks.
http://heatware.com/eval.php?id=27631
http://www.newegg.com/Product/Product.aspx?Item=N82E16820146588
$125 for both sticks.
http://heatware.com/eval.php?id=27631