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They pretty much look the same to me, but I would like to confirm on this before purchasing.

I currently have a 4GB RAM Card:

DIMM1: Kingston 99U5471-012.A00LF   4 GB DDR3-1333 DDR3 SDRAM  (8-8-8-22 @ 609 MHz)  (7-7-7-20 @ 533 MHz)  (6-6-6-17 @ 457 MHz)

And I want to buy a new card from another brand, Komputerbay

Komputerbay 4GB DDR3 SODIMM (204 pin) 1333Mhz PC3 10600 8 GB (9-9-9-25)

Will they work okay together? I have two slots, so it's going to be 8 GB of RAM with both cards.

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What you want to purchase is not compatible with your motherboard. You should purchase the same brand if you can. – Ramhound Jun 11 '12 at 13:43
Same brand? No. Same pinout? yes. Ideally you want same or better speed, timing and so on. – Journeyman Geek Jun 11 '12 at 14:11
up vote 1 down vote accepted

That Komputerbay RAM is SODIMM which means it's only for laptops/notebooks. It's smaller, cheaper and works only in 204pin socket. My motherboard requires DIMM memory of 240pin. I was lucky to find the same memory I have on-board to avoid incompatibilities.

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