Via JC kwam ik bij deze posting op het message board van Lost Circuits, met een samenvatting van de presentatie die de JEDEC (Joint Electron Device Engineering Council) gisteren heeft gegeven over de toekomst van DDR SDRAM:
Here are a few of the take-home messages:
DDR will be generally available and used by Q3 2000. DDR manufacturing costs are about 1.03 x those of current SDRAM, because the same fabs and burn-in tools can be used. it is directly evolving from SDRAM and only needs the addition of a few minor components like DLL and I/O controller needs no initial testing because the parts are there already and have been tested on SDRAM Same power requirements as SDRAM (actually DDR chips are running at 2.5 V as opposed to the 3.3V of SDRAM but they need a terminating resistor on the mainboard which makes up for the difference in power. backed by all major memory manufacturers 45 ns initial latency (after idle) as opposed to 65-70 ns in RAMBUS Projected market share for 2001: 35-40%
RAMBUS will still continue but be restricted to the high end server market with a projected market share of about 8% or less because of
High initial latency >65ns high production costs (current pricing >$900 for 128 MB) specific frequency matching required for each CPU speed grade requires new RIMMs for each CPU upgrade (overclock)
SDRAM will prevail in the lower end market
Transition to DDR2: Q1-2 2001 with over 6 GByte/sec transfer capability utilizing 4-channel VCM or ESDRAM technology.