A Look Inside

As mentioned, this kit is based in two 512 MB DDR2-1066/PC2-8500 memory modules programmed with 5-5-5-16 timings. We decided to remove the heatspreader of one of the modules to take a look. Please don’t do this at home, as you may break your module or one of the chips, as happened to us once.

Patriot PDC21G8500ELK DDR2-1066 PC2-8500Figure 3: One of the modules without its heatspreader.

The memory chips used are from Micron, D9GCT to be more exact – Micron’s full part number for these chips is MT47H64M8B6-37E:D, where “D” is the revision code. The funny thing is that officially these chips are rated as DDR2-553, so Patriot handpicks the chips they buy from Micron to see which ones can run at 1,066 MHz or above.

The competing memory modules from Corsair, TWIN2X1024-8500, are based on Micron’s D9GMH (MT47H64M8B6:D), which is originally a DDR2-667 part.

As each chip has a 512-Mbit density, eight chips are necessary on a 512 MB module (512 Mbits x 8 = 512 MB). On 1 GBs modules sixteen chips are used, eight soldered on each side of the printed circuit board.

Patriot PDC21G8500ELK DDR2-1066 PC2-8500Figure 4: Micron D9GMH (MT47H64M8B6:D) chips.


Gabriel Torres is a Brazilian best-selling ICT expert, with 24 books published. He started his online career in 1996, when he launched Clube do Hardware, which is one of the oldest and largest websites about technology in Brazil. He created Hardware Secrets in 1999 to expand his knowledge outside his home country.