Really, the only true way is to pull out one of the RAM sticks and see if there is a sticker on it. 99% of the time, the bus speed will be there. i.e. 100mhz. Another way is to post exactly what processor you have, how old is the computer (approx), and what brand name, if any, it is. Most of the time, with this info, one can make a pretty accurate guess. Then on the other hand, you might have DDR RAM and that can get dicey guessing that. The best way, with no manuals, is to open the case and look on the motherboard for a make and model #. Then do a GOOGLE for it. The specs should show exactly what RAM and speed and the boards limits on RAM. Otherwise, visit the Brand Name's site and enter the serial or model number.
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