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From: Jay Estabrook (Jay.Estabrookhp.com)
Date: Fri Dec 05 2008 - 13:14:27 CST
Yup, that would be one of the SIMM platforms that used 128-bit mem bus.
Earlier ones (Jensen, Noname/UDB, at least, IIRC) had only 64-bit
mem bus, and thus required SIMMS in pairs, not quartets... :-)
SIMMS == supplied 32-bits wide each
DIMMS == supplied 64-bits wide each
Some later machines took DIMM pairs (DS10), others quartets (XP1000/DS20).
Memory bandwidth, of course, is better the wider the mem bus; that's why
XP1000 feels faster at 500MHz than DS10 at 667MHz. And DS20/ES40/DS25/ES45
have 2 256-bit wide mem buses, when configured/populated correctly.
IIRC, no DEC Alphas could use single SIMM/DIMM.
But at least API's UP1100 would work with a single DIMM.
Hoover, Tony wrote:
> I know that my EB64+ required SIMMs to be installed in groups of 4. It
> had 8 slots.
> On Fri, 2008-12-05 at 13:36 -0500, Smith, Todd wrote:
>> Hello Jay,
>> I only tried one module since that is all that I had, but I thought my
>> UDB will boot to SRM with only a single 8MB module. I just dragged it
>> out and tested just a single SIMM and it never booted. Maybe another
>> 128MB SIMM module would do the trick!
>> Thanks for remembering some fundamental facts. :)
>> -----Original Message-----
>> From: axp-list-bouncesredhat.com [mailto:axp-list-bouncesredhat.com]
>> On Behalf Of Jay Estabrook
>> Sent: Friday, December 05, 2008 13:10
>> To: Linux on Alpha processors
>> Subject: Re: Alpha hardware
>> Hi, Todd,
>> Did you try just 1, or a pair?
>> I thought that all the Alphas (other than some API machines that use
>> and AMD chipset) required SIMMS/DIMMS in pairs... ???
>> I know that I've loaded UDB with 64M SIMMS with success, but never had
>> anything larger to attempt. If those SIMMS were really "late", it's
>> that the SROM code isn't up to configuring them. I don't know if any of
>> the SIMM-based Alphas were ever tested with 128MB SIMMS...
>> Good luck.
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