>Date: Mon, 24 Mar 2003 23:01:28 -0600 >From: Mike Hebel <[EMAIL PROTECTED]>
>On Monday, March 24, 2003, at 11:00 PM, [EMAIL PROTECTED] wrote: >> The DIMMs were 168-pin, and while they did not tell me the memory size, >> the >> label did say they were "EDO." >> >> Why then, in spite of the same pin configuration, did they not even fit >> into >> my 7300? Probably 3.3V vs. 5V. >I can tell you from experience that they probably won't fit. The slots >are cut just slightly off so that they don't seat properly between PCs >and Macs. No, the slots are offset so that you can't put 3.3V RAM in a 5V machine or SDRAM in an FPM or EDO machine. But if you like having burnt holes in select spots on your motherboard, go ahead and force it in. ;-) The 168 pin form factor has been used on a vast array of incompatible RAM. The only distinguishing factor in all this RAM (other than IDing the chips) is the offset of the notches at the bottom of the module. I used to have a URL to a web site that explained the notch placement with respect to the type of RAM but I can't seem to find it. I think it was an IBM site. There is no Mac RAM and PC RAM. There is only RAM that meets certain standards. Each Mac needs its particular type of RAM and each PC needs its particular type. In many cases these types are the same. The buffered 5V FPM and EDO used in the PowerSurge and Catalyst families of Mac machines is mostly just used in Macs. You will see it in very few non-Macs. I think some IBM workstations used it. The 3.3V SDRAM is very common to both PCs and Macs starting wtih the Beige G3 and there's no difference between PC and Mac SDRAM. There is low quality or defective SDRAM. And there are some limitations in the Motorola XPC106 memory controller (Grackle) which make it incompatible with certain DIMMs. But it's not a matter of Mac and PC RAM. But the main point here, is that if the DIMM doesn't fit because of the notches in the bottom, don't force it! There's a reason those notches are offset and it isn't to cost you more money. 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
