Pentium 233MMX
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Thread: Pentium 233MMX

  1. #1
    Join Date
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    Pentium 233MMX

    My mother's K6-2 350 burned out a week ago, so I loaned her my K6-2 450 that I run at 4x112. Well just for the heck of it I tried to see if I could get her CPU working in my system and it was a no-go. Well then I got thinking about another bunt out CPU I had kicking around. It was a Pentium 233MMX. I got it out of a system. The fan had died and the CPU crapped out. I could not get it working no matter what and threw in an old K6 166 I had. Well I put it in my K6-2 system and set it to 2x112Mhz and it booted up just fine. That is 225Mhz. The oddest thing is it now works and I was only running it at 2.4v instead of 2.8v.

    How well do you think a Pentium MMX at 2x112Mhz would do compaired to the K6-2 350 my mom had? It seems to run pretty good for a burned out CPU. I am using the CoolerMaster heatsink that came with my Duron600 a long time ago. I added some Arctic Silver II to it. It runs very cool to the touch. I wonder if it can do 2.5x112. 280Mhz would be pretty good for my 4th computer. I just need a hard drive now.

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  2. #2
    Join Date
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    The Pentium MMX was a bit better than the K6-2, but the K6-2 could clock higher. Much like the whole Athlon/P4W wars when they first started. I'm not sure how much better they were though. That chip should do 280 with that cooling, maybe more with a bit more voltage. I had mine running at 266 with 2.9v, but my cooler sucked. It was some small greenie with a fan. It would freeze at 290, most likely either because I refused to feed it 3.2v (the next step on my board) and I also wouldn't get it a new cooler. Well, I sold that chip long, long ago. I am now getting a P266MMX (laptop chip) from a trade on this site. Runs stock with 1.9v or something...ought to kick *** with a 2.2v or 2.3v with a peltier + Athlon 1ghz CoolerMaster. 4x100 sounds nice but that's a 50%...probably won't make it, but hey maybe!

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  3. #3
    Join Date
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    I actually ran a bunch of benchmark tests on a P233 MMX and K6 233 a few years ago and the K6 smoked the P 233 on everything. Can't remember all the tests off-hand, but it was a clear winner. I also remember reading in some PC mags that the K6 was faster. I'm pretty sure I still have some of those issues. I keep everything- ugh. You might even be able to look some of that up on the web- PCWorld.com for one place- if they have it archived for that long. Actually, I'm writing this post on that very P233 MMX. My mother-in-law has the K6, but she lives in Florida and I'm about 6 states away or I'd run some more tests for you.

  4. #4
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    Oh ya know what, actually I think you are right. Well, partially. There was a debate on this a few months ago. The K6-2 will kill the P233 in business apps, but the P233 edges out in the gaming and 3D arenas, or something like that. It was the Cyrix that was faster (for real) But I do believe the Pentium was the coolest running (unless those 2.2/4v K6-2s beat it out there too)

    ------------------
    MSI K7T Turbo-R w/ 2.35v/3.95v mods
    Certified as "Turbo2-R"
    AthlonXP 1600+ @1900+ @ 1.75v
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    12x DVD, 12x CDRW
    Water-cooled 118w Peltier
    Diamond TNT2 Viper V770 @ 160/210
    Intel Pentium 4 2.53B C1 @2.85GHz (stock volts), watercooled @ 27*C load
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    Microsoft Windows XP Professional SP2

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  5. #5
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    I just don't know why it did not work on the other board. The only thing I can figure is the Pentium MMX cores use the split voltages and the older Pentiums and K-6's use a single higher voltage. I'm guessing the split voltage curcuit burned out and that is why the K-6 worked fine. All I do know is the P233MMX work flawlessly in my FIC VA-503+.

    I bet Intel never expected ther old Pentium to be run on a 112Mhz bus though. Once I upgrade my mom's computer (UPS didn't come today) I will overclock it to 280. The CoolerMaster heatsink sucks, but it is likely much better than most heatsinks used back then.

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  6. #6
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    I just had a look in my old Gigabyte SS7 motherboard manual, and the K6 was a dual voltage chip, just like the Pentium MMX was. The K6 166 and 200 ran at 2.9V, while the 233 ran at 3.2V or 2.2V, depending on the model.

    So, unless there were some K6 chips that ran on single voltage, I have just thrown your theory out of the window

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  7. #7
    Justintime Guest
    this is all i found in my old MVP3 manual pertaining to single voltage cpu's
    Intel P54C , AMD K5, Cyrix/IBM 6X86 , IDT Winchip C6

    all others are listed as Dual Voltage Cpu's and it supports (well, supported ) up to a K-6 2 550MHz Cpu

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  8. #8
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    I finished my mom's upgrade so I will likely build my forth system. I picked up a used 850MB hard drive for $8 to play with in the system. I also have a retail AMD heatsink that came with my mom's Duron 1Ghz. This should keep my K6-2 450 much cooler and I will put the CoolerMaster on the Pentium 233MMX. I think I will just run it at 2.5x100 untill I test out some other componants first. I'm only missing a floppy drive and mouse and the old monitor in the basement might not work (have not touched it in a few years).

    ------------------
    AthlonXP 1600+ 1.65v 42'C
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    Antec SX-630 Case (mod'd)
    TTGI TT-350-SS 370w PS
    AMD Phenom II x4 945 3Ghz | ASUS M4A77TD | 2X WD 1TB SATA 2 hard drive | 2x2GB Corsair XMS3 | nVidia GeForce 8800 GTS | ATI TV Wonder Theater Pro 550 | Antec P-160 case | Antec 650w Earth Watts | LG Blu-ray Super Drive | LG DVD RW | Windows 7 Pro

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