VOGONS


First post, by sd_entertainmnt

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So I've got a cool IBM intellistation Z pro with a dual socket 8 board but originally came with only one Pentium pro 200 w/ 256K L2. It ran perfectly stable at 233. I bought 2 1MB L2 200s and a VRM which run great on the board. Quake 3 went from slideshow to playable with r_smp 1! But with 1 or 2 cpus would crash at post running at 233 🙁 Intel really was pushing that wild cache back then.

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Not content with giving up I wanted to try to overvolt these chips. These are the first ones to use VID pins just like socket 370 but only have 4 and are either open or grounded to set up to 3.5V. My chips run at 3.3 so I figured I'd try 3.5. I wrapped a small bit of wire around VID0 and VID1 and measured 3.42 on the bottom of the board. (3.28 without)

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It was enough to boot into Windows 2000 and run just one timedemo of Quake 3. Would reboot after every time. A little disappointed and that extra 33mhz took me from 32fps to 36 with a TNT2 M64. I don't think I want to give it any more voltage but I'm certainly open to ideas and thought others may benefit.

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Reply 2 of 4, by Skyscraper

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Arctic wrote:

What a sad idea 🙁

There is no point in overclocking that CPU. It runs at its limit already and is very, very rare.
(Sorry, didnt want to be killjoy 😢 )

If it can be overclocked it will be overclocked! 😀

My Intel PR440FX dual Pentium Pro system runs two 512KB cache CPUs at 245 MHz (3.5x70).

It will be upgraded with two new overdrives later and they will run at 5x70 not 5x66. 😀

New PC: i9 12900K @5GHz all cores @1.2v. MSI PRO Z690-A. 32GB DDR4 3600 CL14. 3070Ti.
Old PC: Dual Xeon X5690@4.6GHz, EVGA SR-2, 48GB DDR3R@2000MHz, Intel X25-M. GTX 980ti.
Older PC: K6-3+ 400@600MHz, PC-Chips M577, 256MB SDRAM, AWE64, Voodoo Banshee.

Reply 3 of 4, by sd_entertainmnt

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Arctic wrote:

What a sad idea 🙁

There is no point in overclocking that CPU. It runs at its limit already and is very, very rare.
(Sorry, didnt want to be killjoy 😢 )

I'll confess to being nervous but I used the 256K first to test before using the 1MB. In the end a 5% over volt is conservative for any chip and I'm not looking to do anymore.

Reply 4 of 4, by sd_entertainmnt

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Skyscraper wrote:

If it can be overclocked it will be overclocked! 😀

My Intel PR440FX dual Pentium Pro system runs two 512KB cache CPUs at 245 MHz (3.5x70).

It will be upgraded with two new overdrives later and they will run at 5x70 not 5x66. 😀

Ha ha! There is something about pushing hardware to it's limits just like modding a car. If you aren't crazy about it there is virtually no risk. Those PII overdrives are awesome but I'm not paying the $200+ I've seen them for on ebay!

This board doesn't have anything higher than 66fsb, and the "test" switch selection still runs them at 66 🤣.