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To start, you'll need to set your systems BUS speed. For PowerMacs it's usually 40, 45 or 50MHz. Locate the DIP switches located in the upper left corner of the card. Switch 1 is closest to the ZIF socket (left in image below) and 8 is on the other end. Use the following chart to set your DIP switches for BUS speed. Depending on what this is set to, the other switches (which act as a multiplier) will change what speed your CPU is funning at. A switch is considered ON if it's flipped towards the circuit board (down). | ||
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This first chart is the CPU that came with the card. Nothing fancy. More info to come. | ||
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ASPF: Apple System Profiler - Apple's built-in "system info" app. This is the value before the "/". In MHz.
CPUD: CPU Director - Part of the PowerLogix extension install. This is value after the "/" & is true CPU speed. In MHz.
SW-8 appears to do nothing to BUS or CPU speed with this ZIF. Ignore this dip switch for now. (Faster than 400Mhz?) | ||||||||||||||||||||||||||||||
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I then tested the Z-Force with a stock 400MHz ZIF from a Blue and White G3. Below are some results, but I only did the later 1/2 of the chart. Also note that the 45MHz BUS went way up in reported speeds (in bold below). The MHz rating should relatively fall between the 43 and 47Mhz speeds respectivly. This is unknown why it reported this way, It did seemed stable tho.
Also note that the last line is a new set of previously unknown switch setting multiplier. Additionally, there is no staircased set of non-boots at higher BUS settings that did work at lower speeds as in the first big chart (denoted by ****).
The remailing 4 SW-4 to SW-7 switch settings are still that, unknown. =) | ||
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This time I picked up a SonnetTech CPU. The results were way different than expected. It appears that the multiplier is fixed and the speed is dictated by the BUS speed. Also note higher BUS speeds were attained.
Note that the CPUD speed was obtained as it appeared at the startup splash screen although the OS would freeze as soon as the desktop would appear. | ||
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This site requires the use of frames. If you came to this page and there's no button field to the left, try returning to the site thru the front door at www.dknyte.com. | ||
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