Resetting G3 PMU ? Check out Mac Users Guide for more how-to information. Based on the Yosemite architecture featuring a 450 MHz PowerPC 750 G3 processor the Apple Power Macintosh G3 (Blue & White) has 1 MB of backside cache, arrives with 128 MB of RAM, a 32X CD-ROM drive and an ATI Rage 128 GL graphics card. This was the first design that utilized the “fold down door” enclosure that revolutionized the way we interact with our Mac desktops. It is extremely easy to upgrade and introduced Firewire and included both USB and ADB port connectors.