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

To: milo_morai who wrote (41950)	5/10/2000 12:25:00 PM
From: Bilow	Read Replies (1) \| Respond to of 93625

Hi milo_morai; Re power consumption and RDRAM... It ain't so simple. Problem is that you can arrange for fewer RDRAM chips to be active at any given time. The issue is really a lot more complicated than would be indicated by most of the people commenting on it. Suffice it to say that RDRAM didn't find its first big use in battery powered equipment. Another comparison would be the 2Mx32 DDR chips used in graphics with the least power consumption RDRAM chips. The bandwidths per chip are reasonably similar, but I bet that the DDR chips use a less power than any RDRAM chip. On the other hand, there aren't any next generation 64Mbit RDRAM chips to compare those 2Mx32 DDR chips to. So the comparison is a little unfair. But overall, I have no doubt that RDRAM uses more power in most systems. That's why they are the first (recent) DRAM system to have so much literature devoted to cooling. RMBS just traded through $165. Got to be a good bounce around here somewhere. -- Carl

To: milo_morai who wrote (41950)	5/10/2000 2:35:00 PM
From: jim kelley	Read Replies (2) \| Respond to of 93625

RE:Rdram memory power consumption is lower than a an equivalent DDR memory system Sorry Milo you got it wrong.... The voltages for DDR and RDRAM are now the same at 2.5 V. The currents reported for a Samsung 16Mx8 DDR ram are: IDD0----95 mA IDD1----115 mA IDD4R---150 mA IDD4W---100 mA A 128 bit DDR bus has 8 of these devices active for a read access in parallel. So for a DDR read configuration it looks like 8X 150 mA = 1.2 A. For the RDRAM only one device has to be active. Idd----575/625 mA. Thus, it appears for the same bandwidth at 800 MHZ the RDRAM uses about half the power of a DDR configuration. This is only approximate since there are other chips in both systems. :)