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reading RAM sizes

Old 05-16-04, 03:33 PM
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reading RAM sizes

i'm doing a computer assignment for school and need to know how to read what each of these stands for(which does each number mean when it comes to RAM):

4x64-50
4x32-60
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Old 05-16-04, 03:36 PM
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The 4x64 and 4x32 refers to the amount of RAM on the module. 4x64 is 256, just as it multiplies out.

The -50 and -60 refers to the speed of the chips in nanoseconds. The smaller number is faster.
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Old 05-16-04, 05:43 PM
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Originally posted by X
The 4x64 and 4x32 refers to the amount of RAM on the module. 4x64 is 256, just as it multiplies out.
4x32 is 16MB (32 bit depth quadruples the megabit rating)

You divide the second number by eight (because it is in bits, and there are 8 bits in a byte) and then multiply it by the first number. 4x64 is 32 MB

Here is a nice guide:
http://arstechnica.com/paedia/r/ram_id-1.html

Last edited by Goblincat; 05-16-04 at 05:46 PM.
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Old 05-16-04, 05:49 PM
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Yes, I should have specified it was in megabits, not megabytes, for each chip. Then you have to multiply by the number of chips on the module and know whether it's 8 or 9 chips per byte depending on whether there's parity.
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