weldum wrote:

Another wondering is if i could get an higher multiplier, and how? because i'm not very familiar with these processors.

With these systems, the clockspeed and multiplier are normally set by jumpers on the motherboard.

Yes, but i've read on other threads that the mmx processors read the 1.5 multiplier as 3.5, but don't know if is true.

Pentium MMX, as far as I remember, interpret 1.5x multiplier as a 3.5, so you should be able to speed bump this system somewhat. However...

Years ago I had a 233 MHZ k6 which actually run faster at 75x3 then at 66x3.5. I guess if you could get the system to 275 mhz it would fly, but that is rather unlikely. I don't think that Intel S7 processors understood multipliers bigger then 3.5, but I don't think so.

If you don't intend to buy anything, then there isn't much you can do. PCI->AGP riser card is possible, but I am certain that getting a proper pci graphics card is going to be cheaper then making one of a kind adapter.

Thanks, i'm going to try modifying the multiplier because the fsb already is 75mhz
The thing about the pci agp riser is that i have some electronics knowledge, and a lot of boards that can use as spare parts, so i thought to make it. Also, where i live didn't find anything in pci, and Ebay or sites like that aren't an option.

uzurpator wrote:

Years ago I had a 233 MHZ k6 which actually run faster at 75x3 then at 66x3.5. I guess if you could get the system to 275 mhz it would fly, but that is rather unlikely. I don't think that Intel S7 processors understood multipliers bigger then 3.5, but I don't think so.

High FSB can result in a big performance boost for PMMX CPUs, especially with SDRAM. It takes a lot of pressure of the CPU caches.

weldum wrote:

so I was wondering if it could be feasible to make an AGP to PCI adapter to use older AGP2x (Rage Pro) cards in a PCI slot.

PCI only has 1/4 of the bandwidth of AGP2x, so this wouldn't even be a good idea. It would probably only work with graphic chips that make no use of AGP features anyway, but then you can just stay with PCI.

ps: if you can't buy a better graphics card, a better CPU, etc. I would highly recommend *not* overclocking the CPU any further. At 75x3.5, it will die in a not-so distant future.

Huh? Why would it die? 262 MHz for P MMX is easy, all of them will run at this speed no problem even at default voltage. The only catch is not all MMX are "unlocked", from my experience those in ceramic package don't support 3.5x multiplier.

Indeed. The only Pentium MMX I've ever seen die in-service was one in a system in our data center that somehow lost its heatsink (one of those low blue anodized aluminim ones, affixed with tape - fine when mounted horizontally, but vertically it's asking for trouble). It ran 24/7 for at least five years with no heat sink, the black OPGA baked reddish brown, before failing. If anything in CPU world (other than the 8088) is bulletproof, it would be the later P55C Pentium MMX.

TBH I'd be more concerned about the motherboard. PC-Chips' general build quality is iffy and this specific board with its Utron chipset (afaik along with the M559 the only motherboard ever made with that chipset 😮 ) is dodgy even by their standards. If buying replacements is not an option, that means you really can't afford dying components - at the very least regularly check the electrolytic capacitors on the board and replace if failing.

It seems that the board has 3 jumpers (JP1, 2, 3) for bus speed but only 5 out of 8 combinations are documented on stason's. There is a small chance that the board has undocumented 83MHz bus speed. I can try to look up the datasheets if you can provide me the model number of the clock generator chip.

What are you using this computer for? Even at 250MHz it would be just 10% faster from now and this isn't anything major.

Not sure how fast is your graphic card. Some S3 or Matrox might give you even more then 10% increase. Again.. this depends on the game or app.

Also check your BIOS settings - memory and cache timings should be as low as possible.

gdjacobs wrote:

High FSB can result in a big performance boost for PMMX CPUs, especially with SDRAM. It takes a lot of pressure of the CPU caches.

Sadly this board only allows the use of FPM/EDO Simm 72 modules.

derSammler wrote:

weldum wrote:

so I was wondering if it could be feasible to make an AGP to PCI adapter to use older AGP2x (Rage Pro) cards in a PCI slot.

PCI only has 1/4 of the bandwidth of AGP2x, so this wouldn't even be a good idea. It would probably only work with graphic chips that make no use of AGP features anyway, but then you can just stay with PCI.

ps: if you can't buy a better graphics card, a better CPU, etc. I would highly recommend *not* overclocking the CPU any further. At 75x3.5, it will die in a not-so distant future.

My idea was to use an older AGP card like the Rage Pro Turbo, or something like that, because are early AGP cards, also can't get any PCI card that has more than 1 MB of Ram or 3D capabilities.

havli wrote:

Huh? Why would it die? 262 MHz for P MMX is easy, all of them will run at this speed no problem even at default voltage. The only catch is not all MMX are "unlocked", from my experience those in ceramic package don't support 3.5x multiplier.

Well, I have both processors, 200MHz ceramic package and 200MHz plastic package, the one using is the plastic one.

dionb wrote:

Indeed. The only Pentium MMX I've ever seen die in-service was one in a system in our data center that somehow lost its heatsink (one of those low blue anodized aluminim ones, affixed with tape - fine when mounted horizontally, but vertically it's asking for trouble). It ran 24/7 for at least five years with no heat sink, the black OPGA baked reddish brown, before failing. If anything in CPU world (other than the 8088) is bulletproof, it would be the later P55C Pentium MMX.

TBH I'd be more concerned about the motherboard. PC-Chips' general build quality is iffy and this specific board with its Utron chipset (afaik along with the M559 the only motherboard ever made with that chipset 😮 ) is dodgy even by their standards. If buying replacements is not an option, that means you really can't afford dying components - at the very least regularly check the electrolytic capacitors on the board and replace if failing.

i've changed most capacitors right now, the board seems to be rock solid.

lazibayer wrote:

It seems that the board has 3 jumpers (JP1, 2, 3) for bus speed but only 5 out of 8 combinations are documented on stason's. There is a small chance that the board has undocumented 83MHz bus speed. I can try to look up the datasheets if you can provide me the model number of the clock generator chip.

I think this is the name: CY2265PVC-1
it's nearly a 14.3 crystal.

kixs wrote:

What are you using this computer for? Even at 250MHz it would be just 10% faster from now and this isn't anything major.

Not sure how fast is your graphic card. Some S3 or Matrox might give you even more then 10% increase. Again.. this depends on the game or app.

Also check your BIOS settings - memory and cache timings should be as low as possible.

Have to check bios for the best settings.
Most of my computers have no use whatsoever, but if i can get a little bit more of performance, it would be good.
Currently have more than 10 computers, only 7 have a confirmed usage: Main PC, Main Laptop, Guest PC, Downloads Laptop, XP PC, DOS Laptop, HTPC.

The thing is that i like older computers for these kind of things, overclock, putting games and software that doesn't should run in there and such.
For gaming and normal usage i prefeer something newer, at least XP with good performance, because that's my gaming sweet spot.

After some testing, setting the multiplier at 3.5 does nothing, the processor kept running at 225mhz but, had some kind of lagginess. Everything felt unresponsive, while in 3x everything runs as it should

Unfortunately it can only go up to 75MHz.

lazibayer wrote:

Unfortunately it can only go up to 75MHz.

didn't expect much on this board though. i'll keep it at 75x3=225Mhz
Now i have to do some investigation to see how PCI and AGP works and how to make the adapter

You'll be very limited in which cards will function like this. Not only is AGP double the bus speed, minimum, it also implements several specific features which will not function at all if required by the card. I'm more inclined to recommend that you be patient with what comes along.