<<RECAP: Installed 4 new 128 RAM DIMMs in a 7300 with NewerTech 604e/200 upgrade card and 512k cache. When interleaved AppleTalk Ethernet slowed to crawl. When not interleaved everything worked OK.>> -------------------------------- Today, the problem remained after pulling the suspected 512k cache; so I put it back in.
THE SOLUTION: interleaving different 128 RAM DIMMs all with the same spec's and purchased from the same supplier (Velocity Upgrades) but with obvious different sets of chips. The spec's from the label attached ALL 8 DIMM's read: 16x64-60/FPM/128MB/4K/2BANK. The P/N of the four DIMM's causing the problem is VM165166AB62 (the 2's). The P/N of the four DIMM's that previously worked OK is VM165166AB6S (the S's). The 2's all have identical chips and were ordered a few weeks ago. The S's have two different sets of chips (according to their markings and physical size of the horizontal one). They were ordered in pairs at different times last year. And all S's have different chips than the 2's, again according to their markings. Putting two 2's slots A3, B3 and one set of two S's in slots A4, B4 solved the problem. The ethernet is up to speed and MacBench shows a 7% CPU benefit to the interleaving; TTP shows all RAM is interleaved. However, when I tried the other set of S's in A4, B4 slots, the 7300 would either bomb on startup or had applications unexpectedly quitting once I got by the startup sequence. More info: all the old RAM (the S's) had worked interleaved in this computer with no unusual problems for months before they were replaced by the new RAM (the 2's). And all the 2's have tested OK with RAMometer and TTP; even when interleaved. I no longer have any problems; not sure what conclusions if any can be drawn from this. Best wishes--glen -- 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! | SPECIAL LIST PRICES - Apple PCI Video Cards from $19.99, MacOS 8.5 CD $79.99 Replacement Parts IN STOCK, Apple CDROMs from $19.99 <mailto:[EMAIL PROTECTED]> Support Low End Mac <http://lowendmac.com/lists/support.html> PCI-PowerMacs list info: <http://lowendmac.com/lists/pci-powermacs.shtml> 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
