Hardware Reference
In-Depth Information
can see, the raw chips are designated by their speed in megatransfers per second, whereas
the modules are designated by their approximate throughput in megabytes per second.
Table 6.5 JEDEC Standard DDR Module (184-Pin DIMM) Speeds and Transfer Rates
The major memory chip and module manufacturers normally produce parts that conform
to the official JEDEC standard speed ratings. However, to support overclocking, several
memory module manufacturers purchase unmarked and untested chips from the memory
chip manufacturers and then independently test and sort them by how fast they run. These
are then packaged into modules with unofficial designations and performance figures that
exceedthestandardratings.
Table6.6
showsthepopularunofficialspeedratingsI'veseen
on the market. Note that because the speeds of these modules are beyond the standard de-
fault motherboard and chipset speeds, you won't see an advantage to using them unless
you are overclocking your system to match.
Table 6.6 Overclocked (Non-JEDEC) DDR Module (184-Pin DIMM) Speeds and Transfer Rates
