My badass Pentium Pro with Voodoo2 SLI

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Re: My badass Pentium Pro with Voodoo2 SLI

Postby amadeus777999 » 2018-11-18 @ 12:43

ph4nt0m wrote:There's one thing about 256K PPro's. While the core is 350nm indeed, the cache die is still 600nm. So it may be a limiting factor. Many 256K PPro's don't even POST at 266MHz, though 1M chips don't do it either. The 512K PPro comes with a single 350nm cache die. It takes two of these for the 1M chip with a lot of power consumption. I have measured 11.7A @ 233MHz on the VRM while running Memtest.

I have recently overclocked one 200MHz/256K to 266MHz at 3.4V. It was unstable in benchmarks and couldn't compile a damn thing, so I modded it by soldering 10 1.0uF capacitors on the top.

Image
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It's fine now, passes all benchmarks and can compile a Linux kernel. What's really interesting, this is an early SY013 with the A0 core revision and A cache revision. It isn't supposed to do 266MHz, but it does.


That's an awesome mod!

Only PPro machine that I saw in real life was back in '99 at a friends house - 24" CRT included.

The machine was a few years old and he must have spent a fortune on it. He wanted to sell it to me for a few hundred and I refused as I had no use for it.
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Re: My badass Pentium Pro with Voodoo2 SLI

Postby alvaro84 » 2018-11-18 @ 13:23

Cool to see it! I won't probably do it (though I can't rule it out!) but today I certainly learnt something new.
Shame on us, doomed from the start
May God have mercy on our dirty little hearts
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Re: My badass Pentium Pro with Voodoo2 SLI

Postby ph4nt0m » 2018-11-18 @ 14:06

For those who are considering this mod for themselves, a great source of such 1.0uF capacitors is Socket 370 Coppermine chips whether Pentium 3 or Celeron. These are very inexpensive especially if broken because gold refiners don't want them usually. It's much more expensive to buy new capacitors from distributors. A set of 10 costs $5 to $10 there.
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Re: My badass Pentium Pro with Voodoo2 SLI

Postby mrau » 2018-11-18 @ 15:17

could someone explain please why the reading is so slow on the cpu graph? its the slowest operation on cache here;

also - have You tried resetting the bios? whats with other games, are they slow too?
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Re: My badass Pentium Pro with Voodoo2 SLI

Postby ph4nt0m » 2018-11-18 @ 17:47

That's a Speedsys bug. The speed is fine. AIDA64 also doesn't get the L2 cache speed right under Windows 98.

Image

Code: Select all
RAMspeed (DOS) v2.5.0 by Rhett M. Hollander and Paul V. Bolotoff, 2002-09

1Gb per pass mode

INTEGER & READING         1 Kb block: 1055.79 MB/s
INTEGER & READING         2 Kb block: 1034.43 MB/s
INTEGER & READING         4 Kb block: 1046.53 MB/s
INTEGER & READING         8 Kb block: 1035.43 MB/s
INTEGER & READING        16 Kb block: 606.29 MB/s
INTEGER & READING        32 Kb block: 606.98 MB/s
INTEGER & READING        64 Kb block: 607.32 MB/s
INTEGER & READING       128 Kb block: 607.32 MB/s
INTEGER & READING       256 Kb block: 600.19 MB/s
INTEGER & READING       512 Kb block: 249.65 MB/s
INTEGER & READING      1024 Kb block: 249.65 MB/s
INTEGER & READING      2048 Kb block: 249.71 MB/s
INTEGER & READING      4096 Kb block: 249.71 MB/s

INTEGER & WRITING         1 Kb block: 935.32 MB/s
INTEGER & WRITING         2 Kb block: 924.05 MB/s
INTEGER & WRITING         4 Kb block: 934.50 MB/s
INTEGER & WRITING         8 Kb block: 933.69 MB/s
INTEGER & WRITING        16 Kb block: 565.72 MB/s
INTEGER & WRITING        32 Kb block: 566.02 MB/s
INTEGER & WRITING        64 Kb block: 566.32 MB/s
INTEGER & WRITING       128 Kb block: 560.99 MB/s
INTEGER & WRITING       256 Kb block: 528.42 MB/s
INTEGER & WRITING       512 Kb block: 90.99 MB/s
INTEGER & WRITING      1024 Kb block: 90.98 MB/s
INTEGER & WRITING      2048 Kb block: 90.94 MB/s
INTEGER & WRITING      4096 Kb block: 90.86 MB/s

INTEGER   Copy:      109.51 MB/s
INTEGER   Scale:     108.29 MB/s
INTEGER   Add:       116.16 MB/s
INTEGER   Triad:     113.03 MB/s
---
INTEGER   AVERAGE:   111.75 MB/s
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Re: My badass Pentium Pro with Voodoo2 SLI

Postby doaks80 » 2018-11-18 @ 20:40

Cpu cooler is a time traveler :P
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Re: My badass Pentium Pro with Voodoo2 SLI

Postby Cga.8086 » 2018-11-19 @ 00:09

Zalman CNPS90F on a socket8, wow, nice too see that fit on the old socket
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Re: My badass Pentium Pro with Voodoo2 SLI

Postby Atom Ant » 2018-11-22 @ 20:02

Cga.8086 wrote:Zalman CNPS90F on a socket8, wow, nice too see that fit on the old socket


Yeah, I had to fit, because all my old cpu coolers were way too loud.
My high end of '96 gaming machine;
Intel PR440FX - Pentium Pro 200MHz 512K, Matrox Millenium I 4MB, Diamond Monster Voodoo I 4MB, 128MB EDO RAM, Sound Blaster AWE64 Gold, 4x Creative CD reader, Windows 95...
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Re: My badass Pentium Pro with Voodoo2 SLI

Postby Atom Ant » 2018-11-22 @ 20:03

ph4nt0m wrote:For those who are considering this mod for themselves, a great source of such 1.0uF capacitors is Socket 370 Coppermine chips whether Pentium 3 or Celeron. These are very inexpensive especially if broken because gold refiners don't want them usually. It's much more expensive to buy new capacitors from distributors. A set of 10 costs $5 to $10 there.


What is this mod actually? Why the CPU will run faster if those capacitors are soldered?
My high end of '96 gaming machine;
Intel PR440FX - Pentium Pro 200MHz 512K, Matrox Millenium I 4MB, Diamond Monster Voodoo I 4MB, 128MB EDO RAM, Sound Blaster AWE64 Gold, 4x Creative CD reader, Windows 95...
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Re: My badass Pentium Pro with Voodoo2 SLI

Postby ph4nt0m » 2018-11-23 @ 11:40

Atom Ant wrote:
ph4nt0m wrote:For those who are considering this mod for themselves, a great source of such 1.0uF capacitors is Socket 370 Coppermine chips whether Pentium 3 or Celeron. These are very inexpensive especially if broken because gold refiners don't want them usually. It's much more expensive to buy new capacitors from distributors. A set of 10 costs $5 to $10 there.


What is this mod actually? Why the CPU will run faster if those capacitors are soldered?

Because low ESR/ESL bypass capacitors are very important in high frequency designs. There are bulk electrolytic capacitors in the VRM, some tantalum and/or ceramic capacitors near the CPU socket, but none on the CPU itself. Internal CPU power traces, socket pins and mainboard power traces introduce a lot of impedance. So what seems to be a quality power supply isn't actually at the point of load.
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Re: My badass Pentium Pro with Voodoo2 SLI

Postby Atom Ant » 2018-11-24 @ 20:05

It is really imteresting an 1995 cpu can run at 266MHz with that modification. I woonder a 96' 512k version might could hit 300MHz?

Anybody can adwise hot to turn off vsync on Voodoo 2 SLI for Quake benchmark? I don't find Vsync as option to turn on/off.
My high end of '96 gaming machine;
Intel PR440FX - Pentium Pro 200MHz 512K, Matrox Millenium I 4MB, Diamond Monster Voodoo I 4MB, 128MB EDO RAM, Sound Blaster AWE64 Gold, 4x Creative CD reader, Windows 95...
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Re: My badass Pentium Pro with Voodoo2 SLI

Postby ph4nt0m » 2018-11-24 @ 21:15

Atom Ant wrote:It is really imteresting an 1995 cpu can run at 266MHz with that modification. I woonder a 96' 512k version might could hit 300MHz?

300MHz not going to happen unless on liquid nitrogen or so. 266MHz is already extreme for the 350nm core and cache die. Besides there is no support for multipliers higher than 4x anyway.
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