As for the M725, I noticed that it does not differ much from the M729, in fact it looks like the same motherboard, with some different chips, but both the appearance and the main chips, seem to be the same, looking at my M725 motherboard, and the scrap board that I have, the latter seems to be actually an M729, on the back HW in the BIOS section, you can find in addition to the BIOS of the M729, some BIOS of origin M725, it is clear therefore that the differences are only in detail, and mainly in the renamed chips, here maybe they have simulated the output of a new motherboard, using renamed chipsets, The reality is that those chipsets are exactly the same as before.

Https://theretroweb.com/motherboards/s/ ... -m729#bios

However, to the human eye they will not have appeared, as a clear improvement, in fact they were very cheap cards, and in those years, the quality cost a lot. They were cards used on super cheap PCs, or for updates, the AT format was still ️ quite common, a similar motherboard, could represent a nice step forward, without having to change the entire PC, it was possible to reuse, VGA AGP RAM power supply, ISA or PCI cards, all things that added up cost more than the motherboard.
In the M725 I will initially use a VGA PCI, only later I will switch to a VGA AGP, but not only, I have to recover the Intel PII-300 CPU, which I still have on a Soyo SY-6BA+IV, which I should update to a P!!!-500, in short I will have to deal with several motherboards at the same time.

Today I worked on the Soyo SY-6BA+IV, first thing, I removed the 32 MB SDRAM, it is a PC66 module, not suitable for CPUs with FSB 100 or more, replacing it was easy, I took a 64 MB PC100, and I removed the 32 MB one.

For the moment I haven't decided how much RAM to put, but this card has four banks, so if you need it you can approach 1 GB, for the moment 64 MB is enough, later you may need other banks to install Windows.

Currently, there is a VGA AGP ATi Rage, for the moment it's fine, later I'll see to find something better, or adequate, for now the PC is quite limited, since I have a PII-300, so FSB 66 and multi 4.5X.

Unfortunately I can't find a PIII-500, I have a PII-400 that I tried, but it didn't work, I don't know why, and if that CPU works (?), to recover the PII-300, I temporarily use a Celeron 333 Slot1, we'll see later to try other Pentium FSB 100 CPUs, or I try a Slot1 370 adapter, and I try some Pentium S.370 with FSB 100 .

Running Phil's benches, I saw that the scores between PII-300 and Celeron 333 are very similar, some practically the same, a sign that the 33 MHz more, make no difference.

I continue with some tests, on the Soyo Slot1 (SY-6BA+IV), not having other Slot1 CPUs to try, I remember that I don't know the reason, but a couple of PII-400s don't work, while the Celeron 333 and the PII-300 instead do!

So I move on to an alternative, that is CPU S.370 and Slot1 adapter, I have one that I used many years ago on a PCCHIPS M741?, it's a Mendocino CPU adapter, I don't know which CPU is installed, maybe it's a 500, I don't want to remove the heatsink to check, anyway I tried to install this adapter, and it didn't work, but it could be great, a problem of inoptimal contacts, strange though that it doesn't happen with the two CPUs 300 and 333.

For the moment I would say, that the FSB 66 CPUs, have a good chance that they work, those with FSB 100, instead they don't seem to work, but having tried only two 400 CPUs, I don't know if the problem could be due to these, they should be tested on other MBs, just to see if they are working. ?!

In the CPU collection, I would have other adapters, for Coppermine CPU, I haven't tried any, but here probably, you could try, to put one with a PIII up to 1 GHz, or slightly lower, assuming that then the MB works, and starts correctly, at the moment only 300 or 333 MHz, it seems a bit little for this motherboard.

OHaving many pieces, in my collection, sometimes I don't find right away, what I'm looking for, I usually keep everything of the same type, in the same place, but it can happen that for different needs, something is moved, and after a long time ⏱, remembering where it is is not easy.

I'm looking for some Slot1 CPUs, among which there should be a PIII 133 FSB, a PIII 500 100 FSB, and maybe some others, I would like to try some CPU on the Soyo SY-6BA+IV, currently I have the Celeron 333, it works fine, but excluding overclocking, I would like to exploit it a little better, and be more above the half gigahz, then of course it depends on the CPU, but adapter or not adapter, at least I would like to get to FSB 100.

Among the adapters I have, there is an ASUS S370-DL REV 1.02, with Coppermine CPU, I don't remember if it's FSB 100 or 133, nor the frequency, I kept this adapter to use it on an ASUS Slot1 MB, because in the past I didn't have Slot1 CPU, initially I used adapter and S.370 CPU, in fact on my i810 M766LMRT2, to switch to PIII 1000/100, I used the adapter, because the MB's S.370 doesn't support Coppermine.

For curiosity and further info, here is enough:

Https://theretroweb.com/motherboards/s/ ... 6lmrt-v3-0

I try on the Soyo Slot1 (SY-6BA+IV), that Slot1 CPU that I didn't have between my legs, it was so evident, that I didn't notice it, it's one of the first Pentium!!! With FSB 133, as you can see, it is a 533B /512/133/2.0V SL3BN, given the voltage of the VCORE, it is not a Coppermine, these CPUs probably went on motherboards, with Intel i820 chipset, and although it is not officially supported, many put them on the 440BX or similar, those unfortunately i820 were problematic, for the use of RDRAM, some were adapted to normal SDRAM, because they cost much less, but there were other problems, with the additional chip for the conversion.

There is therefore the possibility that in this motherboard, it also works with FSB 133 (?), I don't know if from the manual this frequency was predicted, from the jumper present there are a couple of possibilities, open or closed, depending on the CPU used, however, there is to consider that at 133 of FSB, the AGP slot works beyond the factory frequency (66 MHz), so there could be some problem, with some video cards, which do not hold that frequency, currently I have a 4 MB ATI RAGE PRO TURBO, considering that the CPU is 300-333 MHz, it could be fine, but In the case of a CPU working at frequencies around 533-1000, a change may be necessary, with another more powerful card, remaining in ATI, a 7X00 or 9X00 are probably more than good, I am not very experienced in this regard, but this possible problem can be solved later.

For now, although I was quite confident, the CPU change didn't give any post code, I don't know what it depends on, mainly I think of the Slot1 contacts, because then putting the Celeron back, sometimes I have to remove it and re-insert it to see the post codes, so if there is no problem with FSB 100 or 133, it could only be some contact, which is a bit oxidized, I think it's better to clean the Slot1 and try the CPUs or adapters again.

Going back to my motherboard, which I have between my legs, the SOYO Slot1 SY-6BA+IV, unfortunately I didn't have the time ⏱ necessary to clean Slot1 and try other CPUs, but first I could do some overclock, more or less light (?) With the Celeron 333, the 300 goes without particular problems up to 450 (usually), theoretically the 333 could reach 500 MHz, and this could remove a big doubt, namely if at 100 FSB and beyond, there is an operating problem, possibly you need to understand what the problem is, if RAM or if it is due to some component of the MB, maybe it is possible that the original capacitors are very close, at the end of their life cycle.

If instead I get the results I hope for, and that is, I get to 500 MHz, with FSB 100, it is most likely the Slot1, to have non-optimal or dirty (oxidized) contacts, surely the cleaning will only do well, but also on the CPU or on the adapter it should be done, finding the necessary time, I will see if I can recover the P3-500 on the Olidata OLI-BX (ASUS P2B), in that I would use the P3-1000/100 and the ASUS adapter.

Going back to the motherboard, SOYO Slot1 SY-6BA+IV, I tried two overclocks, more or less high (?) With the Celeron 333, to reach 500 MHz, imposed by BIOS 100 FSB and PCI 33, the PC starts normally, and I can do some bench, without any overvolt, the game benches, I think they are more demanding for the CPU, and they freeze, maybe an overvolt could solve the problem, it usually increases stability, but ultimately, I was interested that there were no problems, with CPU from FSB 100 MHz, at least with this Celeron it works, I guess there is no reason, that a P3-500 can work, or with any P3/100, in any case There is no RAM problem or anything, in short, I would say that it takes very probably, a bit of luck, and maybe even a clean one at Slot1.

Since at 500 MHz there have been problems with some benches, which I have not delved into, for any possible solutions, I try from BIOS to see if there are other frequencies available, there would be 75 MHz or 83 MHz, but scrolling and rising frequency, I stop at 90/30, and memorize leaving BIOS, the frequency I get is 450 MHz, very interesting because, as we will see later, all the benches are run without any problem, and even visually the PC is faster, I would say that if in Windows there are no problems, you could keep this Frequency instead of the normal 333.

For the moment I'm done, later I'll try to compare the results to the various frequencies, clearly going up the scores improve, but for the moment I would say, that if I had an adapter with a working Mendocino, I could use a faster one, and try to get frequencies around 600 MHz.

Continuing with the Soyo SY-6BA+IV and the Celeron 333 Slot1, I tried other frequencies, before I tried to go beyond 500 MHz, from BIOS I selected FSB 110, to have 550 MHz, the PC starts showing some post codes, but at some point 🧵 it crashes, I don't know if the problem is the CPU or the RAM, I think it is quite likely it is the CPU, I would definitely be sure if by increasing the VCORE, the PC works.?
Since already at 500 I have operating problems with some bench, I try with FSB 95, which corresponds to 475 MHz, with this setting, everything works well 😊 in DOS, but not having Windows, I don't know 🤔 if some program can work or not.
I haven't tried the FSB settings lower than FSB 90, there are some beyond the usual 75 and 83, but I'm not interested in trying them, because the PCI and the AGP goes up 🧂 above 33 and 66 MHz, I think they all work but, I get frequencies below 500, and so I don't think they are of much use, especially if the cards go out of specification, and create other problems.

In the next few days, I will probably find some time ⏱, to do some tests and bench, with Pentium 4 PCs, one is a Compaq FSB 533, originally if I remember correctly there was a 2400, later I changed it with a 3066 NW, later I could have increased the RAM from 512 MB to 1 or 2 GB 🇬🇧, because I reorganized the RAM in various PCs, in the P4s from 533 I removed the DDR 400, and I used only the 266 or 333, for example on another P4 ASUS P4B533 I have a NW 2667 to 3333, raising the FSB from 533 to 667, it works very well with DDR 333 RAM, the DDR 266 does not support the highest frequency of the FSB, and in some bench the PC gives problems.
Another P4 PC, which I have between my paws 🐾, is an ASUS P4B266 with P4 NW 2200 (FSB 400), this is very similar to my first P4, an AZZA 😬 i845 with SDRAM initially a P4 NW 2000, then upgraded to P4 NW 2800/400 and 1.5 GB 🇬🇧 (three RAM of 512 MB each), the only difference is in the type of RAM, which is DDR on the P4B266.
I should assemble everything in a case of the period, with an ivory faceplate and a particular blue transparent plastic, when the work is finished, I will show in another discussion, the entire PC and all the boards 📇.
If it is working, I remind you that the MB has been repaired, replacing some capacitors, a fairly common problem for this generation of PCs, usually after replacement, the PC returns to work.

Having several MB on the bench, I find myself having to free up space, to put others, I currently have some, and among these I have the SOYO SY-6BA+IV, in which I tried various CPUs, some without success, for the moment I have a Celeron 333 at a frequency of about 475 MHz, an overclock of over 40%, the same CPU starts at 500 MHz, but some programs do not work, a sign that an overvolt is probably necessary, with FSB 95 (475 MHz) instead everything works, I also imagine Windows (which I have not yet tried), at this moment, I would have decided to temporarily suspend further tests, for Leave room for other motherboards, later I should take back this SOYO, to complete and finalize the configuration, I do not rule out that I could do some upgrades, and that I can add some PCI cards, for non-present (integrated) features.

On the bench I have a P4 1700 (Willy), maybe I could start it to do some tests, and a possible change of CPU is not to be ruled out, the motherboard is an ECS P4IBAS, apart from the color of the purple PCB, it shouldn't be anything special, in this PC I have Windows installed, and not long ago I did various benches, like 3DMark, so I could see if and how much they improve, changing CPU, or overclocking, or both.

Lately I ran an interesting overclock, on the Soyo SY-6BA+IV with the Celeron 333, the maximum I got in a stable way, it was 475 MHz (95 X 5), even if at 500 it starts and some benches work, unfortunately at this frequency, there were problems with some programs, and I imagine that in Windows you could have blue screens, in short at 475 it works well in DOS, and I suppose also in Windows (?).

It is very likely that with a slight overvolt, about 10%, the PC becomes stable even at 500, and can even start and run at 525, we can see this in a YouTube video of "Retro Inside", in which a Celeron 333 even starts at 550 MHz, but in the video it uses water cooling!

https://m.youtube.com/watch?v=ozpZ1SLEroc

Let's consider that each CPU differs from another, that is, it can be more or less capable of working in overclock, there could be some 333s that work at 550, or others that beyond 500 MHz can't work, so ultimately, my CPU could be a success not so well, I would say that in my opinion, my Celeron 333, only with overvolt can do 500 or a little more, to make the 550 you would have to use a higher overvolt, and in my opinion it is not convenient, for the simple reason that by finding a faster Celeron, maybe they could be reached without Any overvolt.

I have some motherboards to try, including an ASROCK 775, with a couple of interesting things, there are two slots for video cards of different types, one AGP and the other PCI-E, I don't think it's possible to use them both simultaneously, in this regard the manual can dispel (any) doubts, in addition to this there are DDR and DDR2 RAM slots, also here I think it is possible to use only those of one type, but for those who have a broken PC, it's perfect.

In fact, if we have a PC with AGP and DDR, we can transfer everything to this ASROCK 775 MB, and then we can update the VGA or RAM, but there is a third possibility to use the old HW, there is a CPU adapter, which allows you to use the 478 CPU in the 775 motherboards, unfortunately I don't think it's easy to find this one, and I think it costs more than a good 775 CPU, however having one you can install a P4 478, why?

First to temporarily reuse that CPU, and then to see if the performance changes, also in this card it is possible to verify, when switching from one type to another, how much it affects the overall performance, for example a 478 you could see if and how much it goes better, using RAM DDR2 and VGA PCI-E, or do other bench in overclock.

This for the moment is just a hypothesis, first you have to try the MB, then since I don't think you can find a 775-478 adapter, we should see if someone is able to replicate it, and share it, of course it is also true that there are 775 CPUs equivalent to the 478, in short, apart from the Willy and the NW, I think all the Prescotts are on both 478 and the 775.

Link:
https://m.blog.naver.com/PostView.naver?blogI … ngCode=external