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Difference Between SDR SDRAM And DDR SDRAM

DDR for Pentium III: 10 Boards with VIA Apollo Pro 266
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The conventional SDRAM modules and DDR SDRAM modules have the same basic lines, as can be seen in this picture. It is still difficult for the uninitiated to spot the difference between the two DIMM's. SDRAM (above) has two notches, whereas DDR SDRAM (below) only has one. If you have an MSI Pro266 Master or a Shuttle AV32, it's a good idea to take a good look at your board slots. Both boards have SDR DIMM slots and DDR DIMM slots. It's easy to confuse the two if you don't pay close attention to the notches.

An Overview Of All 10 Motherboards

Manu-
facturer
Model PC133 SDRAM AGP 4X (Pro) AMR CNR ACR USB IDE RAID Piezo Speaker Net-
work
AOpen AX37 Plus no no no yes no 4 yes yes no
AOpen AX37 Pro no no no yes no 4 no yes no
Asus CUV266 no yes yes no yes 4 no no yes
Chaintech CT-6VJD no no no yes yes 4 no yes no
DFI CD70-SC no yes no yes no 6 no yes no
Gigabyte GA-6RX no yes no yes no 4 yes no no
MSI Pro266 Master (MS-6366) yes no no yes no 4 yes yes no
Shuttle AV30 (V11) no no no no no 6 no no yes
Shuttle AV32 (V14) yes no no yes no 6 no no no
Soyo SY-7VDA no no no no no 4 no no yes

The complete table of features can be found at the end of this article.

Here you see the Promise chip used by AOpen AX37 Plus, Gigabyte GA-6RX and MSI Pro266 Master (RAID capability), which is the reason why these boards incorporate 4 IDE ports.

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