FullYes wrote on 2026-07-02, 13:57:

Good afternoon. I didn't have a CPU stable enough to run at 2266MHz (133 x 17) and there were no other configurations other than […]
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Good afternoon. I didn't have a CPU stable enough to run at 2266MHz (133 x 17) and there were no other configurations other than ones using the 100MHz FSB setting that worked stably for me (unless I did the reset trick in the first post, which I wasn't willing to put up with long term).

So I decided to put the board back to standard and run with the XP2000 Instead for the time being. I may revisit it someday, if I can find an XP-M barton.

BUT! It also occurs to me, if you have an XP-M processor, you should be able to increase multiplier in software with SETMUL?

Here are pictures of the mod that I took at the time.

The attachment IMG_6974.jpeg is no longer available

^(This was before I finished cleaning it)

The attachment IMG_6971.jpeg is no longer available

^(Zoom in to see where it is, top left quadrant of CPU socket as pictured)

Hi! As I understand it, I did the right. I haven't launched it yet, I want to try it tomorrow. I want to run it on x16 first, then on x16.5. let's see if it's stable, if so, I'll try x17, but it's not so critical for me, I have an idea to do the project the other way around. Try to create a program to lower the multiplier and frequency of the bus, as well as trott at the end after disabling the caches.

Yes it looks correct from what I can see.

Good luck with it! At least by using some wires you can add a switch or jumper to enable/disable it.

As I said at the start of the thread. I got no POST unless I set the multiplier at 17x133 or I used 100MHz FSB.

FullYes wrote on 2026-07-15, 11:56:

Yes it looks correct from what I can see.

Good luck with it! At least by using some wires you can add a switch or jumper to enable/disable it.

As I said at the start of the thread. I got no POST unless I set the multiplier at 17x133 or I used 100MHz FSB.

Unfortunately, I was unable to achieve stable operation on a 133-megahertz bus. As for the multipliers, I initially tried to use a 24x system, but it was not stable. I then lowered it to 23x, and it seemed to be working, but there was still something wrong. I checked it in Unreal, and there were occasional crashes, which could be due to power supply issues. There was an option to put it on 22x (unfortunately, there is no 21x there), but I decided to give up on this idea as well, because I didn't really want to be an overclocker, as my case is quite compact and has poor cooling (the case from the HP Pavilion 8565C is stylish and fashionable 😀), so I decided to stop at 20x, which results in 2000 megahertz, which is generally sufficient for me (it will work better than any Tualatin-s 1400). I also reduced the power supply to a minimum of 1.5 volts

P.S. I'm waiting for 2 1024MB DIMMs to be sent to me, so I'll have 2GB of memory (apparently, the BIOS has a limit, as the KT133A and its Intel 694x(t) counterpart worked stably with 3GB on my p3v4x). All of this, combined with the Geforce 6800 gt ultra and the industrial ssd samsung sm883, should make for an excellent retro build. Awe64 legacy is also coming soon, which will be installed for the GM X2GS se and the Pi zero 2w emulator for old games, all on the same card with a single ISA.

p.p.s I decided to put a 17x on a 133, in theory the temperature should increase by 13%, I will hope that my compact case will pull it. In theory, performance should increase by 25%-30% due to the change in tire size from 100 to 133, so let's see...

I made a table of jumpers by multiplier, maybe someone will find it useful.

Is it working stable with 17 x 133?

I’ve ended up getting an XP-M 2800+ which I can get to its rated speed with setmul by first using the pciset instruction mentioned in the setmul thread then using the setmul program. Problem solved!! I just needed an expensive CPU!

Re: SetMul - Multiplier control for VIA C3 / AMD K6+7+8 Mobile / Cyrix 5x86

I’m booting with the cpu at 1600mhz but then I can use setmul to raise the multiplier to 16x (2133MHz, the rated speed of the CPU) it won’t go higher than 16 for some reason, possibly some form of locking down of the chip? It’s quite a late one - week 31 of 2004

FullYes wrote on 2026-08-12, 12:33:

Is it working stable with 17 x 133?

My friend, sorry, I just saw it now. Yes, it’s working quite stable. I think you did the right thing by buying it, like I have a 2800+ mobile processor.
I don’t have time to check the pciset yet, unfortunately. I hope everything works out exactly the same way as it did for you. Question: did you manage to lower it to 3x?

Mr.Hunt wrote on 2026-09-14, 20:59:

FullYes wrote on 2026-08-12, 12:33:

Is it working stable with 17 x 133?

My friend, sorry, I just saw it now. Yes, it’s working quite stable. I think you did the right thing by buying it, like I have a 2800+ mobile processor.
I don’t have time to check the pciset yet, unfortunately. I hope everything works out exactly the same way as it did for you. Question: did you manage to lower it to 3x?

I didn’t try lower multiplier yet. If I need a slow machine. I have my socket 7 😬

I assume your xp-m cpu is older than mine? I think my cpu won’t boot at 17x multiplier due to being locked from higher multiplier setting.

On the plus side I could overclock the FSB to reach 2400MHz. Though there is some instability. It becomes stable at 2350MHz (147 x 16) definitely a better CPU than I had before!!

FullYes wrote on 2026-09-14, 22:19:

I didn’t try lower multiplier yet. If I need a slow machine. I have my socket 7 😬 […]
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Mr.Hunt wrote on 2026-09-14, 20:59:

FullYes wrote on 2026-08-12, 12:33:

Is it working stable with 17 x 133?

My friend, sorry, I just saw it now. Yes, it’s working quite stable. I think you did the right thing by buying it, like I have a 2800+ mobile processor.
I don’t have time to check the pciset yet, unfortunately. I hope everything works out exactly the same way as it did for you. Question: did you manage to lower it to 3x?

I didn’t try lower multiplier yet. If I need a slow machine. I have my socket 7 😬

I assume your xp-m cpu is older than mine? I think my cpu won’t boot at 17x multiplier due to being locked from higher multiplier setting.

On the plus side I could overclock the FSB to reach 2400MHz. Though there is some instability. It becomes stable at 2350MHz (147 x 16) definitely a better CPU than I had before!!

I don’t think there’s any difference between our processors. All mobile Bartons are roughly the same. Mine didn’t want to work consistently at 2400, and that’s beyond the limits of its die — they’re not designed for that, but they should all work consistently at 2200. P.S. I’m from China, I got a new one (really new), I took another mobile Barton at 2400, we’ll see how it works.

I share your idea of using the K6 as a slower option. I’m also building a PC with a K6-III+ (formerly the K6-2+). This will be a separate pain for me — tinkering with reducing the bus frequency and disabling the L3 cache on the motherboard. To make everything stepwise when slowing down for a particular era. But in my case, Barton’s interest is specifically focused on reducing performance; so to speak, I’m trying to do roughly what I’ll be doing with the K6. If it’s possible, we should give it a try. The processor has a minimum multiplier of 3x; if it works, that’s great! Combined with disabling L1 and L2, it will make for a very good and flexible PC. The only problem is that the bus speed can’t be changed. Well, that’s just a limitation of the motherboard’s architecture.

Mr.Hunt wrote on 2026-09-21, 09:20:

FullYes wrote on 2026-09-14, 22:19:

I didn’t try lower multiplier yet. If I need a slow machine. I have my socket 7 😬 […]
Show full quote

Mr.Hunt wrote on 2026-09-14, 20:59:

My friend, sorry, I just saw it now. Yes, it’s working quite stable. I think you did the right thing by buying it, like I have a 2800+ mobile processor.
I don’t have time to check the pciset yet, unfortunately. I hope everything works out exactly the same way as it did for you. Question: did you manage to lower it to 3x?

I didn’t try lower multiplier yet. If I need a slow machine. I have my socket 7 😬

I assume your xp-m cpu is older than mine? I think my cpu won’t boot at 17x multiplier due to being locked from higher multiplier setting.

On the plus side I could overclock the FSB to reach 2400MHz. Though there is some instability. It becomes stable at 2350MHz (147 x 16) definitely a better CPU than I had before!!

I don’t think there’s any difference between our processors. All mobile Bartons are roughly the same. Mine didn’t want to work consistently at 2400, and that’s beyond the limits of its die — they’re not designed for that, but they should all work consistently at 2200. P.S. I’m from China, I got a new one (really new), I took another mobile Barton at 2400, we’ll see how it works.

I share your idea of using the K6 as a slower option. I’m also building a PC with a K6-III+ (formerly the K6-2+). This will be a separate pain for me — tinkering with reducing the bus frequency and disabling the L3 cache on the motherboard. To make everything stepwise when slowing down for a particular era. But in my case, Barton’s interest is specifically focused on reducing performance; so to speak, I’m trying to do roughly what I’ll be doing with the K6. If it’s possible, we should give it a try. The processor has a minimum multiplier of 3x; if it works, that’s great! Combined with disabling L1 and L2, it will make for a very good and flexible PC. The only problem is that the bus speed can’t be changed. Well, that’s just a limitation of the motherboard’s architecture.

For now, I have finished with overclocking and I have put it back to standard 2133MHz and 1.6V. The CPU stays nice and cool as well.
Hopefully you can get setmul to work with the pciset instruction like I did. It has made it very simple to adjust the frequency with adding the instructions to autoexec.bat on start-up

FullYes wrote on 2026-09-21, 11:36:

Mr.Hunt wrote on 2026-09-21, 09:20:

FullYes wrote on 2026-09-14, 22:19:

I didn’t try lower multiplier yet. If I need a slow machine. I have my socket 7 😬

I assume your xp-m cpu is older than mine? I think my cpu won’t boot at 17x multiplier due to being locked from higher multiplier setting.

On the plus side I could overclock the FSB to reach 2400MHz. Though there is some instability. It becomes stable at 2350MHz (147 x 16) definitely a better CPU than I had before!!

I don’t think there’s any difference between our processors. All mobile Bartons are roughly the same. Mine didn’t want to work consistently at 2400, and that’s beyond the limits of its die — they’re not designed for that, but they should all work consistently at 2200. P.S. I’m from China, I got a new one (really new), I took another mobile Barton at 2400, we’ll see how it works.

I share your idea of using the K6 as a slower option. I’m also building a PC with a K6-III+ (formerly the K6-2+). This will be a separate pain for me — tinkering with reducing the bus frequency and disabling the L3 cache on the motherboard. To make everything stepwise when slowing down for a particular era. But in my case, Barton’s interest is specifically focused on reducing performance; so to speak, I’m trying to do roughly what I’ll be doing with the K6. If it’s possible, we should give it a try. The processor has a minimum multiplier of 3x; if it works, that’s great! Combined with disabling L1 and L2, it will make for a very good and flexible PC. The only problem is that the bus speed can’t be changed. Well, that’s just a limitation of the motherboard’s architecture.

For now, I have finished with overclocking and I have put it back to standard 2133MHz and 1.6V. The CPU stays nice and cool as well.
Hopefully you can get setmul to work with the pciset instruction like I did. It has made it very simple to adjust the frequency with adding the instructions to autoexec.bat on start-up

1.55v for 2133 base voltage for this cpu.

For some reason 1.55v causes crashes at 2133MHz. If i set instead the voltage to “default” in bios. It sets the voltage to 1.6. It’s possible there is voltage drop or offset. I haven’t measured the true voltage. At 1.6v the cpu is stable up to 16x the FSB limit around 2.35GHz