by Tim Wilson
Newer Technology announced today that they have identified and corrected a major problem with several symptoms on older Mac systems. The problem occurs between G4 CPU upgrades and six-slot Power Macs (9500 and 9600) and six-slot clones (Daystar Genesis and Power Computing PowerTower Pro). The problem relates to an "illegal bus condition" triggered by the dual PCI bridges in the 9500 and 9600.
Previous Newer "firsts" include the first Power Macintosh processor upgrade, first G3 PowerMac processor upgrade and the first G3 processor upgrade for the PowerMac 6100, 7100 and 8100 series. Their latest G4 upgrades run at speeds of up to 500 MHz.
The need for speed among such users is obviously often greater than for the Macintosh population at large, which is what makes the option of adding a processor upgrade so attractive. Indeed, some now-defunct clone manufacturers like Power Computing were quite intentional about making upgradeable processors part of their appeal.
More than faster chips, Newer's upgrade cards have offered the prospect of faster access to memory and faster data throughput via wider busses, allowing for a wide range of overall system improvements. Some serious problems arose, however, in the first attempts to add the latest enhancements to these older systems from both clone manufacturers and Apple.
These problems have nothing to do with PCI cards or six-slot computers, but was simply a compatibility issue with some G4 CPU upgrade cardsnot shocking when you consider that there were no G4s, or even G3s, in existence when the six-slot architecture of these earlier computers (known as "Bandit") was developed. Previous attempts to add G4 chips to Bandit systems caused the cache and the system memory get "out of sync" with each other, disrupting what's known as "coherency." Coherency issues will cause all sorts of problems, from corrupted data to crashing apps to total computer lockups.
Supported computers for the MAXpowr G4 upgrade are:
For more information, visit http://www.newertech.com.
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