Memory Help Pages
4. What are all the different types of ram
such as EDO, SDRam, DDR ram?
Listed below are the ram types in general order
of development. Essentially the list starts with the oldest
and slowest types first and the speed increases as you go
down the list
- DRAM : (Dynamic Random Access Memory) only generally
used in 486 and earlier PC's
- FP DRAM (Fast Page DRAM) generally used in 486 and earlier
PC's though still supported in Pentium I class systems
- EDO RAM (Extended Data Out) generally used in Pentium
I and Pentium II class systems and is essentially faster
than FP memory
- SDRAM (Synchronous DRAM) significantly faster than edo
and started as PC66 designed to run with 66MHz bus processors
such as Pentium II. When 100MHz Pentium II processors (350
MHz and upwards) and others such as AMD K6-2 were released
then faster memory designated PC100 (for 100MHz bus) was
required. This was superceded with PC133 for systems that
run 133Mhz bus such as some faster pentium III processors.
- DDR SDRAM (Double Data Rate SDRAM) essentially designed
to double the output of standard SDRAM the DDR equivalent
of PC133 is PC2100. It can speed system performance over
normal SDRAM though the motherboard needs to specifically
support it and the difference should be more noticable on
processors specifically designed for it such as some of
the faster AMD Athlon processors.
- DRD RAM (Direct Rambus DRAM) is another faster type of
ram that competes directly with DDR SDRAM and is currently
the only type of ram supported by Pentium IV (since the
licence for this type of ram is owned by Intel and Rambus
Technologies)
- DVD RAM is not ram at all but is a device that will write
special DVD disks
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