I run my MMX233 underclocked at 133Mhz and 2.5v, simply because Mortal Kombat has less sound issues with 133Mhz and probably other games too.
I really don't see any difference in FPS in Quake and Cramageddon between 233 and 133.
BTW, disabling L1 cache on an MMX will get you very close to 486 DX2 66Mhz speeds (not 33Mhz as some believe), which is very useful.

You need to configure the board for that processor, almost certainly you're overvolting the cpu as well. Get the motherboard manual and change the jumpers.

If you are referring to me, then I have all my jumpers set according to the motherboard manual and voltages checked with a multimeter on top of the jumpers just to make sure.
Bus at 3.3v and CPU at 2.5v (instead of 2.8v).

If you are referring to Panties, then yes, Panties you should make absolutely sure that you checked the CPU voltage because the older P54C runs at 3.3v not 2.8v like the MMX.
Also, my Intel 430TX has special jumpers for P55 (MMX) and P54C, make sure you check those too, something about the CPU I/O BUS.

James-F wrote:

BTW, disabling L1 cache on an MMX will get you very close to 486 DX2 66Mhz speeds (not 33Mhz as some believe), which is very useful.

I'm not THAT stubborn, James-F. 😉 I agree with your findings!

Heh, you're on to me. 😅

TheAbandonwareGuy wrote:

I dare anyone here to top this bad shipping story. I mean Jesus it was a hole filled bag of static being shipped via USPS.....

Seen that way too often. Mine, both not computer-related (well, the second had a computer game-related book in it):

Fragile mint-in-box collectible shipped from the UK to Netherlands packed in a thin but very oversized cardboard box with no padding whatsoever and very shoddy packing tape application. Needless to say, the item arrived in a dire condition as the box was utterly crushed and so was its contents, which also had clearly been bounced around in the box. The collectible itself somehow survived the trip.

More recently, a box arrived at my home completely soaked, crushed and ripped open but quickly retaped on one side (not the sender's fault), having apparently stood in 10 cm of water for a prolonged period. Filed a complaint with the Dutch postal services, who still haven't replied beyond the initial contact. Considering the aluminium traces on the box that suggest it was driven over I bet it fell off a cart at the Dutch postal services' international distribution center, got stuck underneath the cart and then fell into a puddle, where it was not noticed for a while. That would explain the 1.45 hour delay between the two times it left said distribution center. Again, contents survived...somehow. Some of it was soaked though (fortunately not the book). Still weird the postal services can't figure out what happened, as the tape used to repair the wet parcel has their name all over it...literally. 😒

Imperious wrote:

P200 MMX cpu's will happily run at 250mhz all day at stock voltage on a super 7 board, so 233mhz won't cause any problems.

Agree!! Mine does it even at lower voltage than stock 🤣

James-F wrote:

I run my MMX233 underclocked at 133Mhz and 2.5v, simply because Mortal Kombat has less sound issues with 133Mhz and probably other games too.
I really don't see any difference in FPS in Quake and Cramageddon between 233 and 133.
BTW, disabling L1 cache on an MMX will get you very close to 486 DX2 66Mhz speeds (not 33Mhz as some believe), which is very useful.

James-F, are you saying that a Pentium MMX @ 133-MHz with L1 disabled approximates a 486 DX2 66-MHz or do you change the speed back up to 233-MHz for that?

I am just clarifying for myself

Thanks

no fps difference between 133 and 233? maybe you just use an old 1st gen 3d accelerator?

squareguy wrote:

James-F, are you saying that a Pentium MMX @ 133-MHz with L1 disabled approximates a 486 DX2 66-MHz or do you change the speed back up to 233-MHz for that?

Yep, the difference is minuscule with all benchmarks.
When you disable L1 cache you're left with the FSB clock speed which is usually 66MHz.
The MMX will be slightly faster than non-MMX even with L1 disabled.

mrau wrote:

no fps difference between 133 and 233? maybe you just use an old 1st gen 3d accelerator?

3D Acceleration??? Blasphemy!
I'm all about the 320x200 DOS games.
Got Windows98SE installed for USB transfers, nothing more.

Win98 games I like run perfectly fine on my i7 Win7 rig.

so whats the moral? dos systems were mostly waiting for peripherals? sad bit.. i thought every megahartz would count in there, might also mean you could profit from faster system bus (75mhz with 150mhz cpu? 😁) and or faster gpu?

Well, lets call Quake on 640x480 a CPU heavy game.
The framerate you get between 133MMX and 233MMX in is not something I would care about, both are not silky smooth at 640x480, and on 320x200 they are practically indistinguishable.
Same can be said about other demanding DOS games like Tomb Raider, Carmageddon, Duke3D (640x480).
You would think it's almost twice the FPS as the MHz, well it's not, the difference is minimal.

But speed sensitivity with various programs is definitely there between 133 and 233.
Some games like Lemmings and Mortal Kombat 1 are right on the edge where 233 will randomly result in no sound but 133 will run fine.
Even more sensitive games require disabling L1 cache like Day of the Tentacle to have sound.

James-F wrote:

Well, lets call Quake on 640x480 a CPU heavy game. The framerate you get between 133MMX and 233MMX in is not something I would c […]
Show full quote

Well, lets call Quake on 640x480 a CPU heavy game.
The framerate you get between 133MMX and 233MMX in is not something I would care about, both are not silky smooth at 640x480, and on 320x200 they are practically indistinguishable.
Same can be said about other demanding DOS games like Tomb Raider, Carmageddon, Duke3D (640x480).
You would think it's almost twice the FPS as the MHz, well it's not, the difference is minimal.

But speed sensitivity with various programs is definitely there between 133 and 233.
Some games like Lemmings and Mortal Kombat 1 are right on the edge where 233 will randomly result in no sound but 133 will run fine.
Even more sensitive games require disabling L1 cache like Day of the Tentacle to have sound.

I had a different experience going from a P133 to a POD200MMX, but my base system is older (Triton chipset) and no L2 on the mobo. 640x480 games like System Shock, Duke3D and Descent2 went from unplayable to playable. But like I said, maybe your base system is better (MVP?) which could make your 133Mhz performance stronger than mine.

quite frankly on a 133mhz p5 descent should run pretty nicely. id say its more cahce than the chipset. my own experience with an mvp3 with a k6-2 350 was less than orgasmic

mrau wrote:

quite frankly on a 133mhz p5 descent should run pretty nicely. id say its more cahce than the chipset. my own experience with an mvp3 with a k6-2 350 was less than orgasmic

Descent VGA, or Descent2 SVGA?

tough question, i dont remember..

Descent 2 640x480 definitely smoother on 233MHZ but I would not call 133MHz unplayable.

This.... Look's kind of interresting. Does anyone know how it sounds?

And finally... Just paid for one of these... Looking even more interresting. 😀

That was quite an unusual off-topic bit there.. Back on topic with retro hardware buys! A box of parts showed up on my doorstop today. Some of it was uninteresting, but here are the good bits.

First, a Sound Blaster 16 CT3910 with an OPL3

Trident TGUI9440 PCI Video Card

Adaptec AHA-2940 SCSI Card

Socket 7 Motherboard w/Cache module and Pentium 133

I havent figured out the brand and/or model of the motherboard yet, there does not seem to be any markings on it anywhere. I need to get it all fired up to figure it out.