Date: Thu, 11 Jan 2018 21:05:03 +0300 From: Mehmet Erol Sanliturk <m.e.sanliturk@gmail.com> To: Aryeh Friedman <aryeh.friedman@gmail.com> Cc: galtsev@kicp.uchicago.edu, Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>, FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: Re: OT: Max system physical memory Message-ID: <CAOgwaMsH14bPAsDyTpwnNU1hULTkMZ6FuAaswr=aJNxTo=obxA@mail.gmail.com> In-Reply-To: <CAGBxaXkGNoOzsTqUF3n5HipweBg4NUib__OKCXuPPZmq7-OAJA@mail.gmail.com> References: <CAGBxaX=%2BYUuDBOp5n1Kjq6xaJmjEpZ8kWARNMnE_3LwBkNM6GA@mail.gmail.com> <44wp0ofr1w.fsf@be-well.ilk.org> <50615.108.68.170.208.1515682927.squirrel@cosmo.uchicago.edu> <CAGBxaXkGNoOzsTqUF3n5HipweBg4NUib__OKCXuPPZmq7-OAJA@mail.gmail.com>
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On Thu, Jan 11, 2018 at 6:08 PM, Aryeh Friedman <aryeh.friedman@gmail.com> wrote: > On Thu, Jan 11, 2018 at 10:02 AM, Valeri Galtsev < > galtsev@kicp.uchicago.edu> > wrote: > > > > > On Thu, January 11, 2018 7:44 am, Lowell Gilbert wrote: > > > Aryeh Friedman <aryeh.friedman@gmail.com> writes: > > > > > >> My computer (HP Pavilion P7-1234, FreeBSD 11.1-RELEASE [amd64]) has 2 > > >> 240 > > >> pin DIMM (DDR3, PC3-10600) the manual says the max memory is 8 GB but > I > > >> see > > >> some 16 GB packages (2x8GB). If I put one or two of these in will it > > >> see > > >> the extra memory? > > > > > > Probably not. > > > > > > > It is hit and miss. It is possible that specifications were written based > > on largest available modules at the moment of writing. If replacement > > modules are compatible with memory controller (i.e., say, the same > > PC3-10600), it is possible they will work. There still is the chance they > > will not work reliably, _IF_ there are some less trivial specs of memory > > controller are involved. Such may be: bus amplifiers may only handle up > to > > this capacitive load before signals go out of specs. In general, larger > > RAM has larger numbers of address inputs connected to given lead, which > > may entail larger capacitive load. System board layout may have its > impact > > here as well. Apart from that (and maybe some internal schematic > specifics > > of memory controller), there is nothing fundamental about 8 GB RAM limit, > > so it may work. But chance is it will not. > > > > > sysutils/dmidecode disagrees with the manual thus deeping my confusion (I > bought the memory and use it in an other machine that does support upto > 32GB and only has 8 spread across 2 VM's): > > oot@lilith:~ # dmidecode -t memory > # dmidecode 3.1 > Scanning /dev/mem for entry point. > SMBIOS 2.7 present. > > Handle 0x000A, DMI type 16, 23 bytes > Physical Memory Array > Location: System Board Or Motherboard > Use: System Memory > Error Correction Type: None > Maximum Capacity: 128 GB > Error Information Handle: Not Provided > Number Of Devices: 2 > > Handle 0x000C, DMI type 17, 34 bytes > Memory Device > Array Handle: 0x000A > Error Information Handle: Not Provided > Total Width: 64 bits > Data Width: 64 bits > Size: 4096 MB > Form Factor: DIMM > Set: None > Locator: A1_DIMM0 > Bank Locator: A1_BANK0 > Type: DDR3 > Type Detail: Synchronous > Speed: 1333 MT/s > Manufacturer: Samsung > Serial Number: 938D8E07 > Asset Tag: A1_AssetTagNum0 > Part Number: M378B5273CH0-CH9 > Rank: 2 > Configured Clock Speed: 667 MT/s > > Handle 0x000E, DMI type 17, 34 bytes > Memory Device > Array Handle: 0x000A > Error Information Handle: Not Provided > Total Width: 64 bits > Data Width: 64 bits > Size: 4096 MB > Form Factor: DIMM > Set: None > Locator: A1_DIMM1 > Bank Locator: A1_BANK1 > Type: DDR3 > Type Detail: Synchronous > Speed: 1333 MT/s > Manufacturer: Samsung > Serial Number: 938D8C71 > Asset Tag: A1_AssetTagNum1 > Part Number: M378B5273CH0-CH9 > Rank: 2 > Configured Clock Speed: 667 MT/s > > > > -- > Aryeh M. Friedman, Lead Developer, http://www.PetiteCloud.org > _______________________________________________ > > Another problem may be required energy to feed higher capacity memory chips . If the currently available slots are not able to support the required energy , over time they may cause hardware failure and/or memory access errors . Mehmet Erol Sanliturk
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