AOpen MX4GVR - RDRAM (Rambus DRAM); RIMM (Rambus Inline Memory Module); SDRAM (Synchronous DRAM); Shadow E 2 PROM

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Rambus is a memory technology that uses large burst mode data transfer. Theoretically, the data transfer should be high than
SDRAM
. RDRAM is cascaded in channel operation. For Intel 820, only one RDRAM channel is supported, 16-bit data per channel,
and this channel may have maximum 32 RDRAM devices, no matter how many
RIMM
sockets.
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184-pin memory module that supports RDRAM memory technology. A RIMM memory module may contain up to maximum of 16
RDRAM devices.
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SDRAM is one of the DRAM technologies that allow DRAM to use the same clock as the CPU host bus (EDO and FPM are
asynchronous and do not have clock signal). It is similar as
PBSRAM
to use burst mode transfer. SDRAM comes in 64-bit 168-pin
DIMM
and operates at 3.3V. AOpen is the first company to support dual-SDRAM DIMMs onboard (AP5V), from Q1 1996
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A memory space in Flash-ROM to simulate E
2
PROM operation, AOpen motherboard uses Shadow E
2
PROM for jumper-less and
battery-less design