From mboxrd@z Thu Jan 1 00:00:00 1970 To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net> In-reply-to: Your message of "Sat, 07 Feb 2015 18:48:28 PST." <37f6e1b8da602989f0ed9b69e099099b@brasstown.quanstro.net> References: <9dc091ed831c3704ab93c49f93f37cab@hamnavoe.com> <20150207202141.6A037B827@mail.bitblocks.com> <20150208022242.01EAAB827@mail.bitblocks.com> <37f6e1b8da602989f0ed9b69e099099b@brasstown.quanstro.net> Date: Sat, 7 Feb 2015 19:26:29 -0800 From: Bakul Shah Message-Id: <20150208032629.8160AB82A@mail.bitblocks.com> Subject: Re: [9fans] Raspberry Pi 2 Model B Topicbox-Message-UUID: 432bc698-ead9-11e9-9d60-3106f5b1d025 On Sat, 07 Feb 2015 18:48:28 PST erik quanstrom wrote: > On Sat Feb 7 18:18:29 PST 2015, bakul@bitblocks.com wrote: > > On Sun, 08 Feb 2015 02:10:25 +0100 hiro <23hiro@gmail.com> wrote: > > > Do the RPI2s break very fast or why is the warranty such an issue? > > > > A chip's rated clock rate is typically much lower that the max > > freq it at which it can run stably -- and there is fair bit of > > variation in this max freq. A rare few 2836s can even run at > > double the default frequency. But as a side effect of > > speeding it up and/or increasing internal voltage it will also > > run much hotter & if you don't use a heat sink, it is likely > > to fail much sooner. They catch such use by setting an > > irreversible bit inside the chip. RPF's warranty is valid only > > if you left these parameters at their default value or changed > > them as per their instructions (used raspi-config under linux > > or use the setting n config.txt as per what raspi-config > > does). > > i believe the gp understood this issue, but guessed that there > was little chance of breaking this particular chip with this particular > clock speed, so it doesn't much matter if the warranty is void. Who's gp? > On Sat Feb 7 18:32:31 PST 2015, khm@sciops.net wrote: > > > Apparently you can crash one with a light bulb: > > http://www.raspberrypi.org/forums/viewtopic.php?f=28&t=99042 > > crash, not broke. and the light sensitive chip was located at iirc > u16. Freeze, not crash. All semiconductors are photosensitive. In highschool I made my first photosensor by cutting off part of a transistor metal can and removing all the white goop in it!