Purchasing Memory Without Getting a Headache!
Aug 08 '00
This is a little advice that I wrote up for a friend, but should apply to most PC users nowadays.
There are two basic types of RAM: DRAM and SRAM. Most computers are now made with SDRAM which stands for synchronous dynamic random access memory. There are also SLDRAM and RDRAM, both of which are pretty new and probably don't apply to most computers.
Memory: Physical Types
DIMM and SIMM are physical types: SIMMs are 32 bits wide, are short, and have one notch along the bottom; DIMMs are 64 bits wide, longer, and have two notches. SODIMMS also exists for laptops.
SDRAM stands for synchronous dynamic random access memory. DRAM stands for dynamic random access memory. SDRAM is basically enchanced DRAM that can run at higher clock speeds. SDRAM actually synchronizes with the CPU's bus and is twice as fast as the old EDO simms of 486s. Most computers have SDRAM these days; I'm pretty sure most newer computers have SDRAM DIMMS.
Regarding words like parity and ECC: you probably don't need these. Most of the time, only network servers do.
Identifying Serial Numbers
You can usually figure out the type of memory by the serial numbers printed on the chip; I have a stick of 128mb Crucial whose number is CT16M72S4R8E: it means, Crucial brand Memory, 16MBx72 chips, SDRAM, 8ns. Usually, generic memory should be fine. If you're not overclocking like I am, generic memory should be OK. I just like to fiddle with my computer so much that I am in the state of mind that high quality stuff is the only stuff I'll use.
Before Upgrading
I would check inside your computer first...figure out how much memory you have, and how many sticks of memory are in your computer. You may be unlucky and have 64mb of memory in 4 16MB sticks.
Good Manufacturers
I always stick with major brands, like Kingston, Crucial, Corsair, and Mushkin. Again, generic memory may be fine, but I like to stay on the safe side.
Speeds
Although memory can be overclocked, the majority of users don't do it. So, PC100 memory runs at 100mhz, while PC133 memory runs at 133mhz. Most older motherboards don't support 100mhz, so to be on the safe side, if you have a computer older than 1 year, stick with PC100 memory.
Installing
Once you get the RAM, just remove it from its static bag, put it in an empty slot at an agle, and push forward. You should hear a click as the memory slides into place. Consult your motherboard manual, as old memory needs to be inserted in matching sets.
Hope this helps!
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