>This brings up two obvious questions. > >1. Can EDO SIMMs can be used in a WGS 9150, with their > EDO capabilities FULLY FUNCTIONAL? > >2. The WGS 9150 has 8 MB of system RAM soldered to the motherboard. > These RAM chips look like they are NON-EDO. > So even though the 9150's memory controller is EDO-capable, > won't the 8 MB of soldered mainboard RAM make the EDO feature > useless? (i.e. it's kind of like using a SCSI-1 hard drive on a SCSI-2 bus... > every device on the SCSI-2 bus will be forced to run at SCSI-1 speeds > because the SCSI-1 device creates a bottleneck).
How would the DRAM controller know to use EDO rather than FPM accessing techniques? Surely, it knows what the soldered 8 MB is, but it cannot tell what the sticks are. EDO and FPM can coexist in post-7200 PCI Macs because the mobo accesses all DRAM as if it was FPM. (And, we know that a 7200 will not be happy when EDO sticks are installed). So, if both EDO and FPM capable, a 9150 would could access the soldered DRAM as EDO, and default the sticks to FPM, without encountering any problems. But, why would this be an advantage as the amount of EDO which is accessible is presumably only 8 MB. BTW, without decoding the part number of those soldered chips, you cannot tell they're EDO just by looking at them. EDO and FPM are otherwise physically identical. Best use a search tool, specifying the complete chip number. -- 1st-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> 1st PowerMacs list info: <http://lowendmac.com/lists/1st-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]> List archive: <http://mail.maclaunch.com/lists/1st-powermacs/> --------------------------------------------------------------- >The Think Different Store http://www.ThinkDifferentStore.com ---------------------------------------------------------------
