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To: Dan3 who wrote (79331)	5/4/2002 11:25:42 AM
From: Dan3	Respond to of 275872

Interesting observation on RDRAM 1066 and the 850E You can tell that 1066-35 is a rather unique beast. What's different about it is that it's timing numbers are incompatible with the 850, and very probably also the 850E. I think it is highly likely that Intel didn't spin the 850 for the 850E, but instead simply tuned the process to increase the clock rates by 33%. This means that the 850E can't support the 1066-35 speed grade of RDRAM. This is the only explanation I can think of for the fact that Intel has not yet validated any 800-45 RDRAM for the 850E, but have validated lots of 800-40. See #reply-17414166 for the details, including calculations and links. Also note that the parameters for PC800-45 are exactly identical to the parameter for PC1066-32, and the parameters for PC800-40 are identical to the parameters for PC1066-30. From this I conclude that if Intel does support PC1066 on the 850E, it will be with the PC1066-32 and PC1066-30 speeds. Samsung hasn't released any data sheets for PC1066 (RIMM2100) or RIMM4200. Nor have they released any data sheets for 1066MHz RDRAM chips. But they have given a clue as to their future plans in their part decoder. The problem is that the parts decoder for PC1066 includes -35 but no -32 or -30 parts: 15~16. tRAC(Row Access Time) & Speed 00 : for Continuity Module K7 : 45ns/711Mbps(356MHz) M9 : 35ns/1066Mbps(533MHz) G6 : 53.3ns/600Mbps(300MHz) K8 : 45ns/800Mbps(400MHz) DS : DAISY CHAINf MDL samsungelectronics.com. This means that the PC1066 modules are for a chipset other than the 850E. My conclusion is that they are for some of the NPU design wins that Rambus has, and possibly the SiS RDRAM chipset that is due out later this year. This explains why there is no PC1066 for sale only weeks before Intel releases the 850E. The SiS chip isn't ready yet, and industry doesn't buy RIMMs off of pricewatch. There's more at: Message 17417067 Bilow's posts may be the best on SI, technically superb, and entertaining, as well. It's worth one's time to read them all, even if you aren't interested in Rambus (which is the starting point for most of his posts)