VOGONS


The Ultimate 486 Benchmark Comparison

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Reply 240 of 245, by cyclone3d

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He says in the video that the one he used in his previous video wasn't stable at 200Mhz so he had to use a different one.

I really need to see if I have a board that will do 66Mhz fsb.

The current board I am using now, the ASUS PVI-486AP4 maxes out at 40Mhz fsb because the chipset divides the input signal by 2. It can already qualify as the slowest 486 since I can get the CPU to run at a reported 3.90Mhz with some jumper trickery and board mods but it would be really cool to test it out with a clock doubling circuit so I could feed the chipset faster clockspeeds for it to halve. That would potentially give me up to an 80Mhz fsb, but not sure if it would work as I am unsure if the PCI bus has any sort of divider above a certain speed. There are no settings in the BIOS for it.

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Reply 241 of 245, by feipoa

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I have watched the video now. I enjoy his enthusiasm.

It would be interesting if he ran the results with the PCI bus using a 1/2 multiplier, thus at 33 MHz, so we could see how much the clock doubled PCI bus is increasing the results. I would also like to know if this setup can achieve the same stability using more of a conventional socket 370 heatsink/fan. In this way, one might actually be able to build a cased system out it. Lastly, it would be neat to see how much performance loss there is when running the Am5x86 at 50x4 rather than 66x3.

I have my IBM 5x86c-133/2x fully setup in a case and dozens of software installed, but I don't think I have ever tried running the PCI bus at the full 66 MHz. With the PCI bus at 33 MHz, I get 28.5 fps in GLQuake, so I can only imagine what the result would be like at 66 MHz.

If I recall, the MB-8433UUD has an 83 MHz FSB jumper, so perhaps CPUGalaxy can shoot for 250 MHz in his next video! I know I was able to run the Am5x86 at 166 MHz using the 83 MHz setting, but there were some mild screen artifacts. Better yet would be to find a motherboard with a 75 MHz FSB, or swap out the PLL. This should yield an Am5x86 at 225 MHz.

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Reply 242 of 245, by Chadti99

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feipoa wrote on 2021-05-09, 09:28:
I have watched the video now. I enjoy his enthusiasm. […]
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I have watched the video now. I enjoy his enthusiasm.

It would be interesting if he ran the results with the PCI bus using a 1/2 multiplier, thus at 33 MHz, so we could see how much the clock doubled PCI bus is increasing the results. I would also like to know if this setup can achieve the same stability using more of a conventional socket 370 heatsink/fan. In this way, one might actually be able to build a cased system out it. Lastly, it would be neat to see how much performance loss there is when running the Am5x86 at 50x4 rather than 66x3.

I have my IBM 5x86c-133/2x fully setup in a case and dozens of software installed, but I don't think I have ever tried running the PCI bus at the full 66 MHz. With the PCI bus at 33 MHz, I get 28.5 fps in GLQuake, so I can only imagine what the result would be like at 66 MHz.

If I recall, the MB-8433UUD has an 83 MHz FSB jumper, so perhaps CPUGalaxy can shoot for 250 MHz in his next video! I know I was able to run the Am5x86 at 166 MHz using the 83 MHz setting, but there were some mild screen artifacts. Better yet would be to find a motherboard with a 75 MHz FSB, or swap out the PLL. This should yield an Am5x86 at 225 MHz.

Please try the Cyrix with 66Mhz PCI! It might beat the AMD.

Do you remember which video card you were able to boot with the 8433UUD 83MHz setting?

Reply 243 of 245, by feipoa

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I was using the 1/2 multiplier, so the PCI bus was running at 41.67 MHz. So most video cards will work.

My IBM 5x86c-133/2x system has a Voodoo2 in it normally. Will Voodoo2's run at 66 MHz? I have a vague recollection that they won't, so I would likely need to pull it for 66 MHz PCI tests.

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Reply 244 of 245, by Chadti99

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feipoa wrote on 2021-05-09, 10:05:

I was using the 1/2 multiplier, so the PCI bus was running at 41.67 MHz. So most video cards will work.

My IBM 5x86c-133/2x system has a Voodoo2 in it normally. Will Voodoo2's run at 66 MHz? I have a vague recollection that they won't, so I would likely need to pull it for 66 MHz PCI tests.

Only one way to find out, fire it up and bring balance to the force. Restore honor to the house of Cyrix.

Reply 245 of 245, by feipoa

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I fired it up, but the system would hang on AWARD BIOS Extension something... Where it would normally list your ISA cards before POST. So there must be some component not happy with the 66 MHz. Also, on this board, the ISA bus runs at a divisor of the PCI clock and there isn't a fixed 7.x MHz option for ISA like there is for the keyboard controller. The largest divisor is 4, meaning the ISA bus would be running at 16.67 MHz, which is asking too much. So to really test this, I'd have to clear all the hardware out of the system and disable ISA. Something like this is more suitable for benchtop work, but I won't have workbench space for some time.

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