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Technology Stocks : Rambus (RMBS) - Eagle or Penguin
RMBS 88.13+1.0%Nov 21 9:30 AM EST
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To: Ian@SI who started this subject10/23/2001 8:48:25 AM
From: Bilow  Read Replies (1) of 93625
 
Hi all; This is such a typical Rambus lie.

RDRAM is Lowest Pincount and Smallest Footprint
OC192 266MHz x16 DDR SDRAM: 15 chips
      1066MHz        RDRAM:  3 chips

OC768 266MHz x16 DDR SDRAM: 60 chips
      1066Mhz        RDRAM: 10 chips

rambus.com [page 38]

Now when you look at the above, you can already tell that the 'bus has their thumb on the scale because the bandwidth of the DDR systems are 25% greater than the bandwidths of the RDRAM systems. (I.e. 8GB/sec vs 6.4GB/sec for the OC192 example.) But does Rambus really get extra efficiency in the network processor world? No! The most wonderful thing about networks latencies are damn slow, in terms of latency, when compared to any kind of DRAM chips. That means that you can use big buffers and not have to turn your bus around as often. This reduces the RDRAM advantage to a negligible amount, but they still give themselves 25%.

And what kind of DDR is going into OC192 boards? (OC768 is too new to find any examples.) Would anyone really consider using DDR266 on a point 2 point network interface with 3 DDR chips?

Of course not! Any engineer would do exactly what the graphics guys do, and run the chips at much higher frequencies. And in fact, that's exactly what Hynix suggests you do with their x16 550MHz DDR chip:

Hynix announces a x16 DDR SDRAM intended for use in OC192. Does it run at 266MHz? No! It runs as fast as 550MHz. And what's the total bandwidth of three 550MHz x16 DDR chip? 6.6GB/sec! Now isn't that sweet? That's just a bit faster than the 6.4GB/sec you get with three PC1066 RDRAM chips. And which one is cheaper? If you're a design engineer you don't have to guess. Just look around at the graphics boards, what are they using?
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