On Thu, 12 Oct 2006, Ian Collins wrote:
> Al Hopper wrote:
>
> >On Wed, 11 Oct 2006, Dana H. Myers wrote:
> >
> >
> >
> >>Al Hopper wrote:
> >>
> >>
> >>
> >>>Memory: DDR-400 - your choice but Kingston is always a safe bet. 2*512Mb
> >>>sticks for a starter, cost effective, system. 4*512Mb for a good long
> >>>term solution.
> >>>
> >>>
> >>Due to fan-out considerations, every BIOS I've seen will run DDR400
> >>memory at 333MHz when connected to more than 1 DIMM-per-channel (I
> >>believe at AMD's urging).
> >>
> >>
> >
> >Really!? That's surprising. Is there a way to verify that on an Ultra20
> >running Solaris 06/06?
> >
> >
> >
> I can't remember which ones (I think it was the dual socket 940 Tyan
> boards) listed different memory limits for DDR400 and DD333 RAM.
[ .... Off Topic ..... ]
Sure - the situation is quite different for dual socket Opteron
motherboards - the layout can be quite a challenge for these. But we were
talking about a single (939-pin) socket motherboard where the layout is
much easier to do.
Also - if you look at Opteron motherboards with 6 or more DIMM slots on a
processor, the memory speed will (usually) go down to 333MHz for > 4 and
<= 6 DIMMs and 266MHz for > 6 (populated) DIMMs.
This issue (limited # of physical DIMM slots) was supposed to be resolved
by now with FB-DIMMs. Not. The current generation are too expensive, run
too hot and introduce high latencies.
Details emerging on the upcoming quad core AMD (Barcelona) say that it'll
have two memory controllers, one for each set of 2 cores and the contoller
will support both DDR3 and FB-DIMM memory parts. Should be interesting.
Regards,
Al Hopper Logical Approach Inc, Plano, TX. [EMAIL PROTECTED]
Voice: 972.379.2133 Fax: 972.379.2134 Timezone: US CDT
OpenSolaris.Org Community Advisory Board (CAB) Member - Apr 2005
OpenSolaris Governing Board (OGB) Member - Feb 2006
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