The SuperMac C500 and C600 are unique among Macintosh clones. They were the first clones to use a ZIF socket for easy processor replacement. Umax made processors in speeds from 140 to 280 MHz, as well as the CacheDoubler, which provides a double-speed (80 MHz) level 2 cache four times as large as the 256 KB motherboard cache.
Both the C500 and C600 are designed around a motherboard with a 40 MHz system bus, limiting maximum CPU speed compared with machines such as the J700 and S900 that used Apple’s daughter card socket with a 50 MHz system bus, which is the very thing CacheDoubler is designed to address.
|Manufacturer/Model||CPU Speed||Cache Size||Cache Speed|
|Aptus G3/260||260 MHz||512 KB||130 MHz|
|Aptus G3/300||300 MHz||1 MB||150 MHz|
|Aptus G4/350||350 MHz||1 MB||175 MHz|
|603e/240||240 MHz||256 KB||40 MHz|
|603e/240 with CacheDoubler||240 MHz||1 MB||80 MHz|
|603e/280 with CacheDoubler||280 MHz||1 MB||80 MHz|
Also see our Guide to G3 Accelerators for Level 2 Cache Slot for other upgrade options for the C500 and C600.
Keywords: #supermac #cachedoubler