My first experience with this motherboard was "What a piece of crap".... (Rev. E) but then I got the Revision F and a glimmer of hope was back for Tyan, whom I have great respect for because of the quality of their products
The TYAN® Tiger 133™ is a Dual Slot 1 motherboard, sporting 6 PCI slots, the minimum that I need for my use in my heavily loaded workstations.
First things first. Now I have been using my 700Mhz Coppermine™ processors at 133Mhz FSB with thermal acceleration for over five months, so I went into the Award BIOS™ to set the FSB at 133Mhz. To my surprise again, there were no Bios overrides for the FSB, in fact no FSB settings in Bios what so ever. I immediately flashed the Bios to the new version 1.05 and tried again. NO FSB SETTINGS IN BIOS. This was the first big disappointment.
Well out came both processors and the A14 "trick" was applied. (See Tom's Hardware.) This proved to be a worthless attempt on this motherboard, so I began the process of populating the PCI slots with all my hardware. Because the Tiger 133 does not support the Adaptec RaidPort™ SCSI controllers, I elected to use an AMI MegaRaid™ 428 dual channel controller. Because the two AMI raid controller share the Firmware over the PCI bus, slot selection was a problem because the Award Bios of the Tiger seems to "dislike" this arrangement. Finally after placing the AMI 428 in slot one and the AMI 434 in slot 4, I got a full boot.
The idea behind this project was to put together a "over" 1Ghz system using water/peltier cooling that could be built by anyone. One of the first things that control the success of a PIII overclocking project is CPU core voltage control. Also since the A14 "trick" was less than sucessful, another 'mod' would have to be investigated. The 100/133Mhz select is handled by A14 on each CPU. According to the Intel spec sheets for the SC242 processors, 100Mhz FSB is selected by ground and 133Mhz FSB is selected by 1K and 3.3K resistor in series. Also the voltage selections are handled by pins A119, B119, A120, & B120 either grounded or open. So the solution.
I put together a little circuit board that included 9 DIP switches, 1 for 100/133Mhz FSB control and 8 for Core voltage control. The FSB control switch was tied to A14 on the back of the motherboard. In the On position it was connected to GND. In the off position it was connected to GND through 1K and 3.3K resistor in series. The other eight were attached to A119, A120, B119 & B120 of each slot 1 connector.
The voltage control is as follows:
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