From owner-freebsd-questions@freebsd.org Wed May 20 18:05:23 2020 Return-Path: Delivered-To: freebsd-questions@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id E4FEA2F0923 for ; Wed, 20 May 2020 18:05:23 +0000 (UTC) (envelope-from tundra@tundraware.com) Received: from oceanview.tundraware.com (oceanview.tundraware.com [45.55.60.57]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mailman.tundraware.com", Issuer "mailman.tundraware.com" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 49S0z64WYYz4XfM for ; Wed, 20 May 2020 18:05:22 +0000 (UTC) (envelope-from tundra@tundraware.com) Received: from [192.168.0.7] (ozzie.tundraware.com [75.145.138.73]) (authenticated bits=0) by oceanview.tundraware.com (8.15.2/8.15.2) with ESMTPSA id 04KI5DfT008065 (version=TLSv1.2 cipher=DHE-RSA-AES128-SHA bits=128 verify=NO); Wed, 20 May 2020 13:05:13 -0500 (CDT) (envelope-from tundra@tundraware.com) Subject: Re: OT: Weird Hardware Problem To: Valeri Galtsev , freebsd-questions@freebsd.org References: <0a9f810d-7b4b-f4e6-4b7c-716044a9cf69@tundraware.com> <8b13e2f5-6ff4-ecc2-7036-c88cff0f5b6b@tundraware.com> <8732b894-0962-3546-4697-4c2ae0658cb8@kicp.uchicago.edu> <2a2afa7a-cbb9-4664-3b6b-4c955565e947@tundraware.com> From: Tim Daneliuk Message-ID: <72a05905-37d2-dce6-2f59-a5a43e393f5d@tundraware.com> Date: Wed, 20 May 2020 13:05:08 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.6.2 (oceanview.tundraware.com [45.55.60.57]); Wed, 20 May 2020 13:05:14 -0500 (CDT) X-TundraWare-MailScanner-Information: Please contact the ISP for more information X-TundraWare-MailScanner-ID: 04KI5DfT008065 X-TundraWare-MailScanner: Found to be clean X-TundraWare-MailScanner-SpamCheck: not spam (whitelisted), SpamAssassin (not cached, score=-2.105, required 1, autolearn=not spam, ALL_TRUSTED -1.00, AWL 0.80, BAYES_00 -1.90) X-TundraWare-MailScanner-From: tundra@tundraware.com X-Spam-Status: No X-Rspamd-Queue-Id: 49S0z64WYYz4XfM X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=pass (mx1.freebsd.org: domain of tundra@tundraware.com designates 45.55.60.57 as permitted sender) smtp.mailfrom=tundra@tundraware.com X-Spamd-Result: default: False [-2.06 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(-0.20)[+a]; NEURAL_HAM_LONG(-0.81)[-0.814]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[tundraware.com]; NEURAL_HAM_MEDIUM(-0.59)[-0.594]; TO_MATCH_ENVRCPT_SOME(0.00)[]; NEURAL_HAM_SHORT(-0.36)[-0.356]; RCPT_COUNT_TWO(0.00)[2]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:14061, ipnet:45.55.32.0/19, country:US]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[] X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 May 2020 18:05:24 -0000 On 5/20/20 1:02 PM, Valeri Galtsev wrote: > Another factor: older CPUs have higher internal voltages. As you know, internal logics, like ALU, run at much lower voltages than those supplied to CPU. Though these are not directly related to external voltages on CPU pins, still... they quite likely will be more tolerant to higher voltage ripple in case of higher internal voltages. I hadn't thought of that, but this could well explain the issue. -- ---------------------------------------------------------------------------- Tim Daneliuk tundra@tundraware.com PGP Key: http://www.tundraware.com/PGP/