4gb 2Rx4 PC3- 10600R DDR3 ECC RMS stick
Full Buffer dimm
Make Kingston
For MAC Pro 2009 3rd gen onward (not for iMac)
and
for Dell Precision T5500 and T7500 workstation ram
35 $ per one stick
65 $ for 8gb kit
120$ for 16gb kit
240 $ for 32 GB Ram kit