Memory Upgrade on a Satellite 1800-712

I want to upgrade the RAM of my 1800-712.
Actually, i have an SDRAM PC133 256 MB.
It's strange as the bus on this type of machine seems to be at 100 Mhz !
I want to install a Kingston Memory in the second slot.
So, is it mandatory to install the KTT SO100/256 memory (compatible as the Kingston configurator shows), or can i put the KTT SO133/256 ?
As the second is cheaper, i would want to install it ?
Can you confirm the compatibility ?
Thank you.

It is recommended to use the module with the same bus speed. Probably it will work but in my opinion you should not look at the money just on compatibility and be sure that upgrade parts will not be damaged.

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