Difference between DDR3 SDRAM and DDR3 SODIMM for laptop

I have an ASUS A55VD-NS51 laptop with 6GB of RAM and I've been wanting to upgrade the memory for a while. I've finally decided to go through with it, but I am unsure as to whether to buy DDR3 SDRAM or DDR3 SODIMM for it. There is no indication of which kind of RAM it uses, and frankly, I'm not really sure if there is a difference or not, but I would love some insight!

UPDATE: Just ordered more RAM based on what you guys are telling me! Thanks!

Solution 1:

• Maximum memory : upto 8GB
• Number of slots: 2
• Supported memory speeds: DDR3 1333MHz(PC3-10600) or 1600MHz (PC3-12800)
• Supported memory sizes: 1GB, 2GB, 4GB SODIMM modules.

For compatible memory (4GB module), use memorystock.com.

Source

Suggestion: Since, you already have 6GB (4GB+2GB) of memory, you need to replace the 2GB with a new 4GB for max upgrade, the extra ram should be exactly the same as the original for maximum upgrade performance

Solution 2:

For a laptop you need a DDR3 SDRAM SoDIMM of the right speed and voltage.

• The DDR3 indicates the type of DRAM.

• SoDIMM indicates a small outline DIMM. (aka notebook form factor).

• For the other two (speed and voltage) check your manual. It will often state things like DDR-1066 where the 1066 stands for the speed the RAM can work at. In this case 533 MHz .

And last but not least: check how many SoDIMMs are already in the laptop and how many you can use. There is nothing more frustrating than buying new memory and discovering that the memory slot is already in use with an equal sized module. :)

link to the laptops manual here. See page 65.

Solution 3:

According to ASUS, the A55VD has 2 x SO-DIMM slots. You'll want to purchase DDR3 1600 Mhz SoDIMMs. The laptop supports up to 8 GB of RAM, total. If you have 6 GB right now, you probably have one 4 GB and one 2 GB stick and may be able to just pick up one 4 GB stick to go up to 8 GB total.