From owner-freebsd-questions@freebsd.org Thu Jan 11 15:57:10 2018 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 9EE6BE6B4B7 for ; Thu, 11 Jan 2018 15:57:10 +0000 (UTC) (envelope-from galtsev@kicp.uchicago.edu) Received: from kicp.uchicago.edu (kicp.uchicago.edu [128.135.20.70]) by mx1.freebsd.org (Postfix) with ESMTP id 84114776D9 for ; Thu, 11 Jan 2018 15:57:10 +0000 (UTC) (envelope-from galtsev@kicp.uchicago.edu) Received: from point.uchicago.edu (point.uchicago.edu [128.135.52.6]) by kicp.uchicago.edu (Postfix) with ESMTP id 8EC7171803D; Thu, 11 Jan 2018 09:57:04 -0600 (CST) Subject: Re: freebsd-questions Digest, Vol 709, Issue 5 To: Dave B , freebsd-questions@freebsd.org References: <0bce5e82-97ba-0a73-e261-c91473837737@googlemail.com> From: Valeri Galtsev Message-ID: Date: Thu, 11 Jan 2018 09:57:04 -0600 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:52.0) Gecko/20100101 Thunderbird/52.5.2 MIME-Version: 1.0 In-Reply-To: <0bce5e82-97ba-0a73-e261-c91473837737@googlemail.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 11 Jan 2018 15:57:10 -0000 On 01/11/18 06:14, Dave B via freebsd-questions wrote: > That I suspect depends on how many physical address lines are available > for it via the memory management system. > > If the PC documentation says 8G is the max', then that is probably all > that'll be seen by the CPU, even if there is 16G installed. > > There is only one way to find out for sure, at your expense. > > Personally, I doubt it, and the info at > https://support.hp.com/gb-en/document/c03363664  says it wont. > > If it does see 16G (or more) best park it in a corner and thrash it with > a Live Boot Memtest86 CD for some days, to ensure it's working > correctly.   (Let it run to full completion, it can take hours for a > full test, even for 4G!) In addition to memtest86 I would also run much more stressful test, namely have the machine booted into system, run multiple CPU and RAM hungry stuff (make buildworld comes to my mind). The reason for that would be: with signals on memory bus marginally out of specs, system stress will help them being pushed to the limit, which "unstressful" memtest86 will not do and may pass, though the failure on stressed system still may happen. Just my $0.02 Valeri > > But even that, doesn’t fully exercise the memory management system in > the same way an OS will. > > Chances are, if it works at all with the large memory modules, it'll > only "See" and be able to use 8G. > > Have Fun. > > Dave B. > > > > On 11/01/18 12:00, freebsd-questions-request@freebsd.org wrote: >> Subject: >> OT: Max system physical memory >> From: >> Aryeh Friedman >> Date: >> 10/01/18 14:59 >> >> To: >> FreeBSD Mailing List >> >> >> 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? > > _______________________________________________ > freebsd-questions@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" > -- ++++++++++++++++++++++++++++++++++++++++ Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ++++++++++++++++++++++++++++++++++++++++