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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: Elmer who wrote (77635)	10/28/1999 9:11:00 PM
From: Dan3	Read Replies (1) \| Respond to of 1571732

Re: Really? Then Samsung needs you to set them straight... Elmer, Read their article carefully. They compare rambus 800/40 (rambus comes in latency binsplits as well as MHZ binspits). There are few 800/40's out there, but use that part anyway. The paper shows PC133 total latency at 75ns and Rambus at 70ns. But, instead of comparing best PC133 (CAS 2) with best Rambus, they compare the Rambus to CAS 3 PC133. If you use CAS 2, you save 7.5ns. So the PC133 fills the cache line 2.5ns faster than the Rambus 800/40. Now consider DDR 266, doubling the data rate cuts another 15ns off the time required to fill a cache line leaving total latency at 52.5ns for DDR266 and 70ns for rambus - a difference of 17.5ns. On the 64 byte cache line used by rambus and (I believe) Itaniam, rambus will do better against PCXXX but DDR will increase its lead to 110 - 82.5 or 27.5ns This low latency is particularly important for multitasking machines like servers. I think this is why the server manufacturers have pretty much en mass decided to go with DDR, and it looks like Intel will too. Regards, Dan

To: Elmer who wrote (77635)	10/28/1999 11:22:00 PM
From: Windsock	Respond to of 1571732

Elmer - Re: from Samsung "DRAM performance is measured with two metrics: bandwidth and latency. Surprisingly, one type of DRAM delivers the highest performance in both areas - the Rambus© DRAM. It is widely recognized that with the availability of the 1.6 gigabyte per second Rambus DRAM (RDRAM©), sustainable system bandwidth has jumped a factor of 10 over SDRAM. What hasn't been as apparent is that RDRAM latency has also been improved relative to SDRAM. " Do not confuse the fanatic followers with facts. This is unacceptable conduct.