On a AM5x86 w/ M919 clocked at 160MHz, setting memory read/write wait states to 0 makes Quake performance go up quite much, going from 8fps up to 12fps in the START map timerefresh. It risks the inability to soft reset, tho, so I only set it back to 2 if i'm doing something very restarty (installing Windows or its drivers)

and determined that increasing the CLK setting from CLK/4 to CLK/5

Which motherboard are you refering to? If it is a 486DLC-era board, I've seen it where the clock divider option in the BIOS is refering to dividing the oscillator clock rather than the CPU clock. For example, if you are running a 486DLC-40, the oscillator is 80 MHz. To get 8 MHz on the ISA bus, I'd need to use 1/10. On these systems, I beleive it is the CPU which divides the 80 MHz in half because when I probed the CLK pin to the CPU socket, it still indicated 80 MHz on the scope.

Whatever your case is, you'd want to run the ISA clock at 8 MHz, or 10 MHz if you are feeling lucky. What bus speed are you running? 33 or 40 MHz? What is the motherboard's oscillator speed and is the CPU using any multipliers?[/quote]