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The Ultimate 486 Benchmark Comparison

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Reply 240 of 252, 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 252, 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.

Ultimate 486 Benchmark | Ultimate 686 Benchmark | Cyrix 5x86 Enhancements | 486 Overkill Graphics | Worlds Fastest 486

Reply 242 of 252, 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 252, 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.

Ultimate 486 Benchmark | Ultimate 686 Benchmark | Cyrix 5x86 Enhancements | 486 Overkill Graphics | Worlds Fastest 486

Reply 244 of 252, 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 252, 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.

Ultimate 486 Benchmark | Ultimate 686 Benchmark | Cyrix 5x86 Enhancements | 486 Overkill Graphics | Worlds Fastest 486

Reply 246 of 252, by Chadti99

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feipoa wrote on 2021-05-15, 22:37:

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.

Was worth a shot, hopefully you’ll find some time soon. Slightly off topic but what kinda of case and power supply do you use for this setup? Thinking you found an AT case that has a ps/2 hole, or do you use the ps/2 header and bracket?

Reply 247 of 252, by amadeus777999

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I had my Gigabyte GA-486 AM/S up and running and used a peltier element with a capable version of the 5x86. It's unfortunately not 100% stable which I can maybe change by hopping onto another board with a variable voltage regulator.
Nonetheless a nice experiment.

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Reply 248 of 252, by Chadti99

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amadeus777999 wrote on 2021-07-23, 18:24:

I had my Gigabyte GA-486 AM/S up and running and used a peltier element with a capable version of the 5x86. It's unfortunately not 100% stable which I can maybe change by hopping onto another board with a variable voltage regulator.
Nonetheless a nice experiment.

Hell yes! Awesome work!

Any pics of the setup? Was this with Phil’s Dosbench for the quake timedemo?

Any recommendations on where to get a Peltier cooler for socket 3?

Reply 249 of 252, by amadeus777999

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Chadti99 wrote on 2021-07-23, 21:53:
Hell yes! Awesome work! […]
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amadeus777999 wrote on 2021-07-23, 18:24:

I had my Gigabyte GA-486 AM/S up and running and used a peltier element with a capable version of the 5x86. It's unfortunately not 100% stable which I can maybe change by hopping onto another board with a variable voltage regulator.
Nonetheless a nice experiment.

Hell yes! Awesome work!

Any pics of the setup? Was this with Phil’s Dosbench for the quake timedemo?

Any recommendations on where to get a Peltier cooler for socket 3?

Yes, it was from Phil's menu.

You can get the peltier element for little money on amazon. Be aware that, naturally, water droplets build around it, so prolonged use is dangerous as in fluids sinking into the socket!
I have changed the setup to a LS486E, so unfortunately I can't post pics of the rig running with the GA-486AM/S. The LS486E has much lower PCI performance so I will commence tests at 3x66 instead of 4x50. I will need some custom made srams which will arrive in a few weeks... until then some screens from the old setup.

The cpu needs juice in the 4.2 to 4.4 region [(4.2, 4.4) exclusive] to work properly - minimum being 3.98V for a boot screen.
Once it goes up to 4.4 it does not start up anymore.

I lost the score of 3DBench2 - which was over 122fps. I'll redo scores once I got the new srams.

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Reply 250 of 252, by Chadti99

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amadeus777999 wrote on 2021-07-24, 19:39:
Yes, it was from Phil's menu. […]
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Chadti99 wrote on 2021-07-23, 21:53:
Hell yes! Awesome work! […]
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amadeus777999 wrote on 2021-07-23, 18:24:

I had my Gigabyte GA-486 AM/S up and running and used a peltier element with a capable version of the 5x86. It's unfortunately not 100% stable which I can maybe change by hopping onto another board with a variable voltage regulator.
Nonetheless a nice experiment.

Hell yes! Awesome work!

Any pics of the setup? Was this with Phil’s Dosbench for the quake timedemo?

Any recommendations on where to get a Peltier cooler for socket 3?

Yes, it was from Phil's menu.

You can get the peltier element for little money on amazon. Be aware that, naturally, water droplets build around it, so prolonged use is dangerous as in fluids sinking into the socket!
I have changed the setup to a LS486E, so unfortunately I can't post pics of the rig running with the GA-486AM/S. The LS486E has much lower PCI performance so I will commence tests at 3x66 instead of 4x50. I will need some custom made srams which will arrive in a few weeks... until then some screens from the old setup.

The cpu needs juice in the 4.2 to 4.4 region [(4.2, 4.4) exclusive] to work properly - minimum being 3.98V for a boot screen.
Once it goes up to 4.4 it does not start up anymore.

I lost the score of 3DBench2 - which was over 122fps. I'll redo scores once I got the new srams.

Awesome scores and thanks for the info! Could you share your jumper settings?

Reply 251 of 252, by feipoa

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If my memory doesn't deceive me, the GA-486 AM/S has a through hole resistor for the voltage set resistor and can easily be swapped out with a trim pot to give you variable voltage. I did this on mine.

Can you elaborate some on these "custom made SRAMs"? Are they in a SOJ to DIP adapter? What speed and brand are they? You can still get SOJ SRAMs new in the 10 ns flavour from Cypress.

Ultimate 486 Benchmark | Ultimate 686 Benchmark | Cyrix 5x86 Enhancements | 486 Overkill Graphics | Worlds Fastest 486

Reply 252 of 252, by amadeus777999

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@Chadti99 - it will take me a few days since I have to take care of some boards and the GA-486AM/S needs some testing plus bios re/flash.

@feipoa - I would be interested in modding it as I have a 4015 DC/DC down converter lying around - any instructions for the mod?
These srams are soj ones soldered onto adapter boards. Luckily Tiido(thanks again!) did it for me and they seem to be working great. Unfortunately 10ns seems not enough to get the system cache stable at the best timings. I have a possible solution for this but can only deliver results in a week or so. There's authentic ISSI 12ns parts among the modules and they do not work stable at all at 60mhz...