Well, I am reorganizing and I do have a 333gp that I might be able to take to around 280mhz so hmm ... 🤔

I'm not familiar enough with 3Dmark. Will the CPU bottleneck with more powerful GPUs enough that the 3Dmark scores get normalized close to each other anyway?

I had an MII 300 (75mHz FSB) but it died, I really hope I find a fast mII again some day. For some reason I really like these chips. Unfortunately they appear to have become mostly destroyed by gold scrappers 🙁

There are some decent prices on 366 chips on ebay right now

heckyeah wrote on 2022-03-10, 07:39:

Well, I am reorganizing and I do have a 333gp that I might be able to take to around 280mhz so hmm ... 🤔

I'm not familiar enough with 3Dmark. Will the CPU bottleneck with more powerful GPUs enough that the 3Dmark scores get normalized close to each other anyway?

I’m betting that you’ll probably see best results with geforce 2/3 same as the pentium 233 and k6-3+ aiming for the stars threads

I have a couple old results.

MII-400, Shuttle HOT-591p, GeForce 2 GTS
3Dmark '99 - 1205 3D marks, 1296 CPU
MII-400, Shuttle HOT-591p, Radeon 9200
3Dmark '01 - 1535 3D marks

Last time I tried to use the MII-400, Win98 got corrupt and wouldn't boot anymore, 🤣. Right before that I had benched an MII-300 with a Savage 2000, because I thought it would be cool to start a thread about benchmarks without any AMD/ATI/Intel/nVidia. Gave up though after that and my ASRock PV530 showed up dead.

I gots like 90 things I wanna do already. Would have loved to run my old MII rig which ppl don't believe I played Q3 engine games on... I didn't say I played them fast 🤣 ... think that was an MII 366 at 3.5x83 on a VX motherboard. Rage Pro XL or something.

Re: Cyrix 400gp multiplier settings

Cheat sheet^ btw

About to do a run on my 400gp
Freeway design ultra mobo
Radeon 9800 pro
Audigy 2 zs

Looks like 4x100 is a no go at 2.2v

3.5x100 it is!

Annnnnd crash…

2.3v…

Crash

2.4v….

Images: 3dmark 2001, followed by 2000, followed by cpu-z, followed by super pi 1m

Sphere478 wrote on 2022-03-10, 08:43:

There are some decent prices on 366 chips on ebay right now

heckyeah wrote on 2022-03-10, 07:39:

Well, I am reorganizing and I do have a 333gp that I might be able to take to around 280mhz so hmm ... 🤔

I'm not familiar enough with 3Dmark. Will the CPU bottleneck with more powerful GPUs enough that the 3Dmark scores get normalized close to each other anyway?

I’m betting that you’ll probably see best results with geforce 2/3 same as the pentium 233 and k6-3+ aiming for the stars threads

Do you have ebay link?

366:

https://www.ebay.com/sch/i.html?_nkw=cyrix+366gp&_sop=15

Oh here is a interesting find:

https://www.ebay.com/itm/393974359571?

I think this is using the 433gp core. 2.2v, small square cover on back,…

Omg😂

Halo CE!! It lives!!!!
https://youtu.be/jx-KE-xlNS0

Sphere478 wrote on 2022-03-11, 06:42:

Oh here is a interesting find:

https://www.ebay.com/itm/393974359571?

I think this is using the 433gp core. 2.2v, small square cover on back,…

Yeah, I just ordered one because I always wanted a 2.2v instead of the hot 2.9v. It's gonna be a few months so I'll have to bench the 333gp instead.

Anyways, nice OC! That's why I wanted a 2.2v. 😄 I think a 350mhz would be something like a 466 or 500GP by Cyrix logic 😁

heckyeah wrote on 2022-03-11, 07:06:

Sphere478 wrote on 2022-03-11, 06:42:

Oh here is a interesting find:

https://www.ebay.com/itm/393974359571?

I think this is using the 433gp core. 2.2v, small square cover on back,…

Yeah, I just ordered one because I always wanted a 2.2v instead of the hot 2.9v. It's gonna be a few months so I'll have to bench the 333gp instead.

Anyways, nice OC! That's why I wanted a 2.2v. 😄 I think a 350mhz would be something like a 466 or 500GP by Cyrix logic 😁

!!!!!All bow before the 500GP!!!!!

(I think the bios stops at 500gp 🤣)

Well well well, maybe doing 6x86 stuff jumped from 90 on the list to top 20 at least. I was thinking about what boards I've got, in particular what Via boards I've got because they are known to support the 6x86 burst mode which can give up to 5% performance gain vs Intel chipsets. There's some scribbles I've got in old notes about an MVP3 board and FIC boards, but the only one I know for sure I've got is a Lucky Star 5V-1A. Which does this... Lucky Star 5V-1A / 5V-1B review - scaling form XT levels to K6-II levels

It's not a "super" 7 really but got a couple of higher FSBs there that would be interesting to try my 366GP on if I can dig it out. My ALI V boards are reserved for the K6-2/3+ but maybe at some point in not so near future I'll try a 2x140 run on them for giggles. If the 366GP won't make an appearance, then an IBM MX266 will have to do until something better turns up. Though it's a 2.5 x 83 part, so since IBM is supposedly conservative on clocks, might do as well as 300/333 PRed Cyrix parts. Not sure if I've got some Cyrix hiding in "non-computer" areas though a few years back a bud was wanting a gold top CPU for a display piece and I gathered up Pentium 90s and Cyrixes to show him what I had, but he more had a P-Pro in mind I think, anyway, the P90s didn't make it back to the computer areas again and unsure what cyrix were with them. So I think I've got one or two stored somewhere really random, box or drawer in living areas somewhere. Don't think they would have been upper end speeds I was offering to give him... might have been a 233 though and you never know until you try them how well they will go, and it probably wasn't in my mind then to verify whether they were .35 or .25 or what.

All my decent PCI graphics cards are also spoken for, got so many TNT2 AGP though, wish I could magic wand them into PCIs.... or magic wand an AGP slot into more motherboards. Got "interesting" period correct stuff that nobody actually wants to use, like Permedia 2, Rendition Verite, and Rage Pro.... thought I had a Rage 128 PCI which would be passable, but IDK if I imagined it because there's no sign of the thing.... and I'm not up for blowing $1000 for the 6 places I can think of to install a V3 PCI.

I'll have to see what turns up, it's not like I'm trying to build this tomorrow.

Bah, I could get a post @ 112x2.5 on my SY-5EMA+ (so a 433gp I guess) easy enough but a Win98 OS drive I snagged off a different MVP3 board didn't want to play ball so I'll have to do a clean install just for this.

^ that board is super cool, being able to down clock that far! Wow!

Cuttoon found this

http://www.cpu-galerie.de/html/cyrixmii.html# … 20II-400GP-3x95

Just adding this here

The Cyrix M2 block diagrams, as well as the Cyrix M2 databooks,which can be a bit quirky to find.

Also the 433GP max ratings:
Vcc3 = IO Voltage
Vcc2 = Vcore (this is for a 2.2V chip) (The NSC node used is just godawful with clock scaling also)

Contents are:

- Cyrix MII BIOS_Writers_Guide
- Cyrix MII Data Book 1999
- CyrixMII MII 100MHz Bus Design
- Cyrix MII MII 400 Addendum
- Cyrix MII MII 433 Addendum
- Some Cyrix CPU Detection code logic that does clock timing in an interesting way

Not sure if it extends into MX/MII but other Vogons noted some differences between multi implementation on earlier 6x86 Subtle differences between Cyrix and IBM 6x86s

Another thing that's strange is some sources have a "half shrink" noted, 0.30 micron between 0.35 and 0.25 .. I'm wondering if that accounts for IBM citing 2 to 3 watts lower power on some of theirs vs the Cyrix or whether that's some extra doping, thicker layers or something they used on their spins. CPU-world doesn't even cite a manufacturing process for a lot of the models... I don't know if that's because some PR models, even those at same actual clocks same multi were on different processes through 97-99 or that they just can't nail any down. Somewhat less detail than for other CPUs anyway, and models seem lumped as noted, and there's some obvious models missing.

Anyhoo, little bit of treasure for the thread at the bottom of the MII-400 page, somebody benched an overclock...
https://www.cpu-world.com/CPUs/MII/Cyri ... 2.2V).html
But only with 3DM2001 and a "too good" GPU which means it can probably be beaten by GF2 or GF3, maybe even a Radeon DDR or hot TNT2.

Sphere478 wrote on 2022-03-11, 06:42:

366:

https://www.ebay.com/sch/i.html?_nkw=cyrix+366gp&_sop=15

You'd better get this 366 rated v2.9, quite rare and interesting, if you ask me.
The v2.9 is faster clock to clock compared to v2.2.
Be sure to have a nice beefy heatsink 😁

Also if you have different cyrix\ibm cpus, you can use this utility it gives some nice info:

Nemo1985 wrote on 2022-03-12, 01:56:

You'd better get this 366 rated v2.9, quite rare and interesting, if you ask me. The v2.9 is faster clock to clock compared to v […]
Show full quote

Sphere478 wrote on 2022-03-11, 06:42:

366:

https://www.ebay.com/sch/i.html?_nkw=cyrix+366gp&_sop=15

You'd better get this 366 rated v2.9, quite rare and interesting, if you ask me.
The v2.9 is faster clock to clock compared to v2.2.
Be sure to have a nice beefy heatsink 😁

photo_2022-03-12_02-55-44.jpg

Also if you have different cyrix\ibm cpus, you can use this utility it gives some nice info:
cyrix.zip

The 2.9v 366 chips pop up on ebay all the time, they aren’t hard to come by. The 2.2v chip is not something that pops up very often.

Apparently, there were quite a few speeds to get the 2.2v core.

I can try to do some benchamarks with my (two) 366 chips later tonight maybe. I’m intrigued at the faster clock per clock performance.

Seems like the better clocks would make up for the less clock per clock performance.

Probably, still the higher v2.9 frequency is 250 mhz (little to none overclocking chance), while the v2.2 is 285 (or 300 for the almost impossible to find 433gp).

That's the performance difference at 250mhz clock:

The configuration was slightly different compared to the 200 mhz, but somewhat comparable.

At 200 mhz the difference (quake 320 resolution) was 1,7 fps, while at 250 mhz it was 2,2!
So apparently going up with clock increase the performance gap.