Re: 4gb (4 memory sticks) at 400Mhz on socket 939 MB -- JEDEC specifications ...
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On Sat, 2006-07-08 at 13:22 -0500, Mohamad Al-Saqer wrote: > Is it possible to find an AMD 64 socket 939 motherboard which supports 4 > memory sticks of 4GB to run at max speed 400MHz? From some available MB > manuals the speed is either downgraded to 333MHz when 4 mem sticks are used > or there is no mention of the issue at all. JEDEC specifications require that only one (1) DDR 200MHz (DDR400/PC-3200) 64-bit DIMM be used per 64-bit channel (2x32-bit banks), or two (2) for registered per 64-bit channel (4x32-bit banks). That means a maximum of (2) DDR DIMMs for unregistered Socket-939. That means a maximum of (4) DDR DIMMs for registered Socket-940. > From my search on google, some blame it on limitation of the motherboard > chipset. Others blame it on processors prior to the E revision. Nothing on > the net I came across would be a clear answer. Hit many discussions on JEDEC DDR specifications. Here's the rule ... DDR 100MHz (DDR200, PC1600) 3 DIMMs/channel, 6 DIMMs for S939, 12 DIMMs for S940 DDR 133/166MHz (DDR266/333, PC2100/2700) 2 DIMMs/channel, 4 DIMMs for S939, 8 DIMMs for S940 DDR 200MHz (DDR400, PC3200) 1 DIMM/channel, 2 DIMMs for S939, 4 DIMMs for S940 > I would suspect that tyan K8E (and K8E-SLI) doesn't have this limitation, does > it? Because I saw at amd website some bechmarks on systems built on this > motherboard with 4GB installed. However no say on wether these system were > running at 400MHz FSB or less. > I appreciate help and any clarification. As above. BTW, your greater concern than signaling is timing. Slower timed DDR400 DIMMs often cause more of an impact that faster timed DDR333 DIMMs. I personally use at least 2.5-3-3-6 for DDR400. If you're using 3-3-3-8 or worse for DDR400, you might as well run at DDR333. -- Bryan J. Smith Professional, technical annoyance mailto:b.j.smith@xxxxxxxx http://thebs413.blogspot.com ---------------------------------------------------------- The existence of Linux has far more to do with the breakup of AT&T's monopoly than anything Microsoft has ever done. -- amd64-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/amd64-list
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