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DDR SDRAM - Learn and compare before you buy memory

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Learn before you make a memory purchase.
Read up on the various types of DDR SDRAM.
DDRSDRAM.net provides clear information.

128MB DDR SDRAM chip

128MB is the smallest memory amount in a DDR SDRAM chip. Since the memory level will not be sufficient for many users, two chips may often be used together in a computer to combine for 256MB of RAM. These days, it is entirely possible for one program alone to require well over 128MB of memory. When you consider the operating system and other programs that will be running in the meanwhile, a single 128MB DDR SDRAM chip simply doesn't cut it in many cases.

One use for a 128MB chip is as an upgrade on a computer which already has a decent amount of RAM, yet still has an open memory slot. For instance, if the first slot is taken by a 256MB DDR chip, the second may be filled with a 128MB chip, bringing the system memory up to 384MB. 512MB and 128MB chips may also be combined in the same manner to produce 640MB of memory. Adding the 128MB in these situations is a cheap alternative which can give the PC a boost that may be enough to get it over the top.

The RAM must also be compatible with the motherboard being used, although in some cases the chips can be "underclocked" or "overclocked" in order to make a match even where the they are not the same. You can read more about the different data speeds and frequencies:

• PC1600 DDR (100MHz)
• PC2100 DDR (133MHz)
• PC2700 DDR (166MHz)
• PC3200 DDR (200MHz)

Please note: a laptop will typically require memory designed specifically for it, while standard memory is generally made for use on a desktop PC.


Other DDR SDRAM chip amounts:

• 256MB DDR
• 512MB DDR
• 1GB DDR