At 09:59 PM 7/9/01 -0400, Mark Fraleigh wrote the following:
> I have a question that probably been answered many time but here goes.
> How do I find out what type of ram my computer uses and what amount of
>pins that it can use. Also if there are two open slots do both have to be
>filled in order for the ram to work and should each slot contain the same
>amount of ram.Thanks in advance for your time and help.
Ooops, missed part of the answer.
Also pay attention to the order. Install the newer and bigger pair into the
first bank (bank 0) and move the older pair to the second bank (bank 1).
In general, the first bank must be filled before using the second bank.
SIMMs are harder to match up and DIMMs are easier to match up.
You also need to pay attention to the speed. If your system has 60
nano-second (ns) access time SIMMs installed, and you add a pair of 70ns
SIMMs you could run into trouble if your system needs at least 60 ns. Be
sure to get at least the same speed or faster. Consult your system
documentation to be sure. If your system accepts the mixed speed modules,
the speed they will run at will be the lowest common denominator, e.g. if
you mix 60ns with 70ns SIMMs, they will run at the slower 70ns.
DIMMs are usually labeled with the bus speed they're guaranteed to run at.
PC-66, the first generation DIMMs, were made to run at a front side bus
(FSB) speed of 66 MHz, because the processors they were used for (older
Pentium II and Celeron) ran with a 66 MHz FSB. PC-100 means the DIMM can run
fine with a FSB up to 100 MHz (or lower, they are backwards compatible).
PC-133 means the DIMM can run fine with a FSB up to 133 MHz (or lower, they
are backwards compatible). But the other way around you'll run into problems
when trying to run a PC-100 DIMM on a 133 MHz FSB.
--
Gerry Boyd
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