That's fantastic that you used one processor to emulate multiple cpu's at different mhzs for these benchmarks.
I figured I post/ask this here since you seem quite experienced in this area...
I will be building an Asus PVI-486SP3 soon and have two CPU's at my disposal. Just waiting for parts to begin.
It's coming with a genuine Intel 486DX4 100mhz chip, and I opted to try/buy a spare AMD 5x86 P75 (486DX5 133) Model AM486DX5-133W16BGC (Lower volt than ADW variant).
It's been a while since I've tinkered with Socket 3's.
If my memory serves me correctly, these toggle between 2 and 3 multipliers. Where some AMD chips see 2x as a 4x.
And different boards have different jumpers for FSB's usually from somewhere in the range of 25mhz up to 50mhz.
According to my motherboards manaul page 3...
https://www.dropbox.com/s/n29olmnecbpondp/pvi … 486sp3.pdf?dl=1
...I will need to set JP7 to pin 1&2 (3.45v). The only other option is 3.6v. Is the 3.45v setting safe on the AMD 5x86 133 BGC chip that runs at 3.3v and the i486DX4 100mhz that runs at 3v?
I see the CPU jumper settings in the manual for the intel 486DX4 100mhz &EW chip on page 6 (3v chip, so I suppose the board knows to supply the correct volt) but I'm confused as to what setting to use for the AMD 5x86 133 chip. I'm assuming it's the same as the 486DX4 100mhz. On page 7 there is an identical configuration for the AM486DX4=SV8B setting.
The board supports 25mhz, 33mhz & 40mhz clock/fsb (no 50 😒)
With the board set to 33mhz, the i486DX4 100mhz should read 100 (3x33mhz). I suppose if I wanted to try 120mhz, I'd set it to 40mhz (3x40mhz) and set the VLB wait state (page 10) to "1 Wait" (Nice that it has this option as most boards have issues on VLB over 33mhz FSB. I'm assuming there will be a slight performance hit on the VLB this way though).
Now if the above is true, then how does the AMD 5x86 reach 133mhz? Or does it just know automagically to use a 2x multi as the 4x as the AMD's do even though it's set to 3 (assuming I leave the jumpers alone). And if THAT is true, then I would assume to attempt 160mhz I'd just change the FSB to 40mhz as I mentioned above? (4x40mhz).
Any help is appreciated as I don't want to start the build off with smoke & fireworks (although that may be a glorious to watch).
Upon further research, I've realized that I have rev. 1.8 of the board. Rev. 1.22 has a 50mhz option for FSB.
Does anyone know if a 50mhz FSB is achievable on rev. 1.8 by copying the jumper config settings from the 1.22? Just curious in the event that I want to tinker with different FSB's once I figure everything out.