Difference Between SDR SDRAM And DDR SDRAM - DDR for Pentium III: 10 Boards with VIA Apollo Pro 266

4. Difference Between SDR SDRAM And DDR SDRAM

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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