>From: Jeff Drummond <[EMAIL PROTECTED]> >Date: Wed, 9 Oct 2002 12:26:44 -0500 (CDT)
>Sorry to follow-up my own post, but I think I've found my problem. \o/ > >After trying more approaches than I care to mention, I finally started >pulling out memory DIMMs and the problem disappeared. With some trial >and error, I traced the problem to, oddly, my two *newest* DIMMs--two >128 MB FPM 4K refresh DIMMs that I purchased from Other World Computing-- >Note: these DIMMs work *fine* with a slower G3 ZIF processor; they only >appear to cause a problem in conjunction with my 500 MHz G3 ZIF. I ran >memory tests (TechTool and ramometer) on these DIMMs with both the old and >new processor, but they didn't find any problems. Whatever's causing the >problem may only be happening at startup/restart. Did you test using the RAM Sandwich method? The problem with the software testers is that they cannot test the RAM in which the OS is residing. So even if you get a good result from, e.g., RAMometer, you don't know for sure that your memory is good. When Velocity Upgrades first came on the scene with affordable RAM this drove me crazy. My second order from them obviously contained some bad DIMMs but I kept getting inconsistent results as to which DIMM was the problem until I tested systematically in the sandwich configuration. To test a DIMM in a PowerSurge family machine, put a known good DIMM in A1 and another in A4. These DIMMs need to be big enough to hold the OS, but the smaller they are the faster your testing will go. I usually use a pair of 64s here. Then place a DIMM or DIMMs to be tested in A2 and/or A3. Run RAMometer at least 1300 iterations (that's the highest iteration at which I've heard of a consistent failure). Note that you can replace A with B in all the designations above. If you don't have known good DIMMs, try the RAM sandwich until you get a failure free run. The DIMM(s) in the middle (A2, A3) are probably good. You can't be sure about the ones in A1 and A4. Use the newly validated DIMMs as your bread and test away. Jeff Walther -- PCI-PowerMacs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | -- Sonnet & PowerLogix Upgrades - start at $169 | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> PCI-PowerMacs list info: <http://lowendmac.com/lists/pci-powermacs.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive:<http://www.mail-archive.com/pci-powermacs%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
