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Technology Stocks : Rambus (RMBS) - Eagle or Penguin -- Ignore unavailable to you. Want to Upgrade?

To: John Walliker who wrote (28974)	9/8/1999 10:01:00 AM
From: Dave B	Respond to of 93625

Up about 3 1/2 at 7:00AM (10:00AM for you Easterners). Looks like someone's getting a little religion this morning (not on huge volume, but every convert helps <G>). Dave

To: John Walliker who wrote (28974)	9/9/1999 4:22:00 PM
From: Bilow	Read Replies (3) \| Respond to of 93625

Hi John Walliker; That Micron data sheet is just the short form. If you want links to full data sheets, I've thrown some into this post. (But they are big!) You supposed that rambus interface will have a lower power consumption than the DDR one. This may be true, but the vast majority of the power consumption in a DRAM based memory system is in the memory chips, and rambus chips are power hogs. Samsung has a full data sheet on DDR, so we can compare power consumption between RDRAM, DDR and SDRAM... Comparing power consumption of 64Mb, x16 size parts from Samsung: Oper. P.Dn P.Up Brst Refr ICC1 ICC2P ICC2N ICC4 ICC5 SDRAM: 110 1 20 145 150 mA (max) DDR: 125 20 45 TBD 200 mA (max) IDD,STBY IDD,ATTN IDD,ATTN-W IDD,ATTN-R Rambus (a): 120 200 700 575(b) mA (max) notes a. The CMOS interface consumes power in all power states. b. This does not include the IOL sink current. The RDRAM dissipates IOLxVOL in each output driver when a logic one is driven. From the above, it is quite obvious that given two memory systems of the same size, the rambus memory system is going to use about twice as much power. If you doubt this, why don't you go find the articles published in EE-Times announcing new heat sinks devoted to rambus chips? You won't see any such parts announced for DDR SDRAMs, and the reason is that they are a lot more energy efficient. As I, and many (non INTC or RMBS) industry experts have said before, rambus is a technology that is optimal for very small memory systems, such as the ones used in playstations. To use this technology for large memories isn't real bright, because of power consumption, chip cost, ease of design, and ease of manufacture. -- Carl