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There three main considerations to use when you choose memory. The three are speed, type of memory and the size of the memory.
Upgrading the memory on your computer makes it a lot faster. Instead of upgrading computers, try upgrading your RAM and see that its the cheapest way of making your old computer work like new.
By upgrading the graphics card.
The speed, compatibility, and the maximum memory allowed. ;-)
Upgrading your firmware version does not affect your save games as it is changing the on chip system and not the memory stick.
cpu matherboard memory
speed compatability maximum memory allowed
Speed, memory type (DDR2, DDR3 etc), and capacity.
Dell Inspiron E1705/9400 allows for upgrading of the cards and memory modules.
4 GB of memory should be more than enough, unless you're doing some heavy picture editing or gaming.
The benefits of upgrading your phone to an iPhone 4 is that it has better screen resolution, more memory, and it is so much faster than the other versions.
It is important that you ask a technitian to do it if you don't know how.