PC1200 - upgrade the memory

For a PC1200 (1200MHz) with 128 MB DDR SDRAM I want more 128 MB.  
1. It's absolutely necessary  to add the same chips ?
2. I know that FPM and EDO speeds are written in nanoseconds (ns).  How can I identify the SDRAM and DDR speeds ?(example please)
3. The difference between SIMM and DIMM(as name) is that DIMM has chips on both sides?

Thanks.
omegabetaAsked:
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CallandorConnect With a Mentor Commented:
I'm surprised you even have such a slow-speed DDR: I though PC1600 was the bottom.  You can use faster speed DDR, and it will run slower to accomodate your slower RAM.  

For DDR, it is no longer useful to know the speed in nanoseconds.  The important numbers are the bandwidth (PC1600, PC2100, PC3200, etc, which represents the Mbit/sec transfer rate) and the latency (which is a 4-sequence number, where the first number is CAS latency and lower is faster).

SIMM is Single Inline Memory Module, and DIMM is Dual.  It has nothing to do with sides, but it does have to do with the data path: Single is 32-bit, Dual is 64-bit, and SIMMs have to be used in pairs with Pentiums, while DIMMs do not.  http://sbc.webopedia.com/TERM/D/DIMM.html
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omegabetaAuthor Commented:
Thanks.
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