Why aren't you using the AWE synth in Doom? It should natively support AWE...

Might&Magic III is a known speed-sensitive game, and an old one from 1991 at that. Try pulling out all the stops to slow down your system. You say you can slow it down to 466MHz with multiplier. I strongly doubt that, P3 CPUs have locked multiplier. 466MHz sounds like you're lowering FSB from 133MHz to 66MHz. What you can also do is disable all cache. Disabling L1 cache will seriously impact performance. Maybe enough to even run the game adequately...

Might&Magic 1: look for a DOS memory limiting tool. You have so much RAM it can't correctly measure it so incorrectly concludes you have too much. Limit RAM to 4MB or so and it should work, assuming it's not much too fast.

Apart from that, which limitations you will hit depend on what you want to play. I use two systems for DOS games, a P3-500 with AWE64 Gold (and GUS and an Aztech 2320 card as well) for late DOS, which runs 99% of what I actually like to play (Colonization and OMF2097 mainly), and for picky old stuff a 486SX-33 with SB1.0 replica and MusicQuest MIDI adapter. I might even have to lower FSB on that one for M&M3...

sorry i meant that i change FSB with an onboard switch between 66-133mhz. the clock multiplier is stuck at 7

I'd say its a solid setup as is.
Main issue I had on a similar spec PC was Pascal 200 error, which is easily fixed
Fix "Error 200" (Divide by zero) - by Snover and Stiletto (updated!)

Your always going to get that 1 game that doesn't want to work, Even back in the mid 90's my DX2/66 ran into compatibility issues. For those games you can build another PC built specifically around that games requirements or just use dosbox for that single game happy in the knowledge rest of your games run perfect on your retro PC .

You have a pretty good setup, and later DOS games will run well on it. Some of the earlier ones are speed sensitive though. See this list for more details: https://www.vogonswiki.com/index.php/List_of_ … sensitive_games

You might be able to get around some of those speed issues by disabling L1 cache via SetMul and such.

Because of the ISA soundcard, your system is quite capable for DOS if you are somehow able to slow the CPU down.

You may want to consider a program called THROTTLE, it allows you to slow down your CPU using the chipset's ACPI energy saving features and disabling cache. Note that your motherboard needs to have a supported chipset.
Personally, I use throttle with the parameter for not disabling caches and use SETMUL for doing that instead. That way I can set 32 different speed settings: 16 provided by throttle, times two (with and without L1 cache).

Here is the link...
http://www.oldskool.org/pc/throttle/DOS/

You will also need some RAM disk utility for games that have trouble with too much RAM. With it you can create a ram disk which will use the upper portion of your memory. The larger the ram disk size, less memory will be available for programs.
From the top of my mind, Alien Breed gets stuck on the copy protection screen if your system has more than 16 megs of RAM. So for instance in my system with 256mb, I create a 240mb ram disk so only 16mb are available and problem solved.

thanks for all the help guys, this is my MOBO: https://www.gigabyte.com/Motherboard/GA-6BX7-rev-24#ov

i can only adjust the speed by two mini switches on the board, one for clock (which does nothing for me since its locked and the other one changes FSB 66-133mhz. i guess i will run at 466 mhz with a 66mhz bus when i play older game and disable cache in bios,

that throttle program works well thanks, but it doesn't seem to change my cache but i can disable it in bios anyway, but i tried both the throttle program and disabling cache in bios after some experimenting i noticed they both affects speed and affect each each other, i can also change system speed which means i have three means of changing speed, all affecting each other so i got quite many speed settings in total to choose from.

Might and magic 3 works, and i tried a game called tank wars which was the perfect benchmark since its a speed sensitive game.

MrSteelrose wrote on 2022-12-08, 00:05:

that throttle program works well thanks, but it doesn't seem to change my cache but i can disable it in bios anyway, but i tried both the throttle program and disabling cache in bios after some experimenting i noticed they both affects speed and affect each each other, i can also change system speed which means i have three means of changing speed, all affecting each other so i got quite many speed settings in total to choose from.

Might and magic 3 works, and i tried a game called tank wars which was the perfect benchmark since its a speed sensitive game.

http://bretjohnson.us/source/source.htm

beside throttle, CPUCACHE and SLOWINT1 will do magic. I can transform a Pentium 3 1ghz in a XT with this