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P55c at Overclocked to 300mhz?

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Reply 220 of 225, by clueless1

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Thanks, man!

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Reply 221 of 225, by NostalgicAslinger

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CPU-Z Vintage Edition under Windows ME, also here completely stable with 2,8V VCore (GLQuake with Riva 128ZX/8MB SGRAM and Prime tested):

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Reply 222 of 225, by Sphere478

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feipoa wrote on 2020-12-06, 03:46:

Does it have SMP enabled? Or disabled like the Tillamooks?

someone reported being able to get two tillamooks working without cache I'm not sure where that post went it may be in the "tillamook working with cache thread" or the "dual socket 5/7 motherboard thread". when asked they didn't do any more tests though.

I think two tillamooks would work on upgrade adapters and with pin mods on a old socket 5 motherboard that used non intel smp

I personally have 1 tillamook and a dual socket 7 tyan s1564 board based on a 430hx if someone wants to donate a tillamook I can do some tests but I have already tried pairing a 233mmx and a tillamook 266 on it. it detected only a single tillamook (which it actually did call tillamook in bios)

so in skimming this thread it seems no one has figured out how to do 4x on a p55 yet? I'm really hoping to be able to somehow overclock these 2 233mmx chips

edit here it is Re: Tillamook 266MHz and working L2 cache?

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Sphere’s socket 5/7 cpu collection.
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Reply 223 of 225, by Doornkaat

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There simply isn't a register for 4x on P55C cores.
The first stepping didn't even have the 3.5x register.
The chip had great yields and many run at 262MHz with 75MHz FSB and stock voltage but at official ~266 MHz many people wouldn't have understood why they should buy a 266MHz Pentium II. Because of that I suspect Intel actively chose not to implement multipliers >3.5x on P55C chips for marketing reasons.

Reply 224 of 225, by bloodem

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Doornkaat wrote on 2021-03-02, 12:15:

The chip had great yields and many run at 262MHz with 75MHz FSB and stock voltage but at official ~266 MHz

I'm actually playing right now with a Pentium MMX 233 that runs at 290 MHz (FSB 83) semi-stable at 2.8V and 100% stable at 2.9V 😀 It's quite impressive how fast it can be... A Voodoo 2 is bottlenecking the CPU in GLQuake at 640 x 480. Even Unreal Gold is actually playable with an average of 39 FPS (13 FPS min) during the first two levels. My second PC from two decades ago (an AMD K6-2 @ 500 MHz with a Riva TNT 2 M64) was a LOT slower in games... if only I had known at the time 😀

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Reply 225 of 225, by amadeus777999

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Some beautiful scores and overclocks - the 333mhz is pretty beefy.
I have one running @124x2.5(~310mhz) on an ASUS P5A-B. It does take only 450 realtics to run demo3 of SW Doom which translates to 165.9fps. It's kinda "rendered" obsolete by the existence of the Tillamook though.