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To: DavidG who wrote (30665)	3/18/1998 12:15:00 PM
From: TREND1	Respond to of 53903

Davidg You wrote <<Also everyone should be aware that Slot 1 and 2 are not the only PC100 compatible possibilities, Socket 7 chips such as AMD K6s will also run at 100MHZ. The classic and MMX INTEL Pentiums can NOT.>> Davidg This is a very good point ! The increased speed will actually help AMD K6s more then PII's because the ADM K6s do NOT the cache L2 !!! Larry dudash

To: DavidG who wrote (30665)	3/18/1998 12:25:00 PM
From: rob	Read Replies (1) \| Respond to of 53903

David Yes the -8 MU parts are all 125Mhz parts. As in the -8A and-8E are both capable of 125Mhz CL=3 but only the -8E part can do CL=2 at 100Mhz. The whole spec naming thing is a mess... every company has its own lingo for it. There is very little standardization. In general the industry likes to call SDRAM's by there CL=3 performance, but that's no rule. There is something I feel I need to add to the PC100 discusions and that is there is another spec called tAC. This is the speed at which data comes out after a clock edge. In a 100Mhz bus the the clock period is 10ns. The tAC spec for PC100 is 6ns. This means the SDRAM needs have valid data on the memory bus 6ns after the clock edge goes high. This is proving difficult to achieve with "wider" SDRAM's X16 and X32. These wider SDRAM's are needed for 32MB DIMM's and 16MB DIMMsother wise the smallest RAM you can offer is 64MB. Which maybe ok in a few months. Anyway this tAC spec does not change for CL=3 or CL=2 parts and therefor for a CL=3 part tAC=6 is the hardest thing to meet. The reason this is important is that I hear that so far DRAM vendors have been "cherry picking" there parts to send as samples to the box OEM's. When it comes time to fill production orders there maybe a temporary shortage of PC100 parts due to the tAC requirments. BTW this tAC=6 is key to making the 100Mhz board work because of the time delays in a PC bus. But again... if PC100 parts come at too much a premium over what people like to call PC66 parts... OEM's will hold back on production because the high cost is to difficult to pass on to the channel. Look of CPQ struggle... today there are rumors that even giving away free monitors with the boxes is not moveing merchendise... The price of PC's have become very inelastic, And the volume price curve gets real steep after $1000... even businesses are catching on sn corporte buyers are going for low price instead of performance. This is all bad for the DRAM... PC100 or not. RP