as H3nrik V! already posted on the other thread.
https://www.pchardwarelinks.com/cpuspeed.htm

scroll down to the 'Motherboard Multiplier Settings' table

weedeewee wrote on 2024-02-15, 14:19:

as H3nrik V! already posted on the other thread.
https://www.pchardwarelinks.com/cpuspeed.htm

scroll down to the 'Motherboard Multiplier Settings' table

Yes, that table is incomplete. 😉 there are more.

Sphere478 wrote on 2024-02-15, 16:11:

weedeewee wrote on 2024-02-15, 14:19:

as H3nrik V! already posted on the other thread.
https://www.pchardwarelinks.com/cpuspeed.htm

scroll down to the 'Motherboard Multiplier Settings' table

Yes, that table is incomplete. 😉 there are more.

It helps if you add exactly which ones you are referring to as 'more'.

weedeewee wrote on 2024-02-15, 17:45:

Sphere478 wrote on 2024-02-15, 16:11:

weedeewee wrote on 2024-02-15, 14:19:

as H3nrik V! already posted on the other thread.
https://www.pchardwarelinks.com/cpuspeed.htm

scroll down to the 'Motherboard Multiplier Settings' table

Yes, that table is incomplete. 😉 there are more.

It helps if you add exactly which ones you are referring to as 'more'.

The table is being updated. This will take a while. You’ll see. For one, 1x isn’t mentioned for cyrix

Sphere478 wrote on 2024-02-15, 18:02:

weedeewee wrote on 2024-02-15, 17:45:

Sphere478 wrote on 2024-02-15, 16:11:

Yes, that table is incomplete. 😉 there are more.

It helps if you add exactly which ones you are referring to as 'more'.

The table is being updated. This will take a while. You’ll see. For one, 1x isn’t mentioned for cyrix

Yes it is mentioned.

For 1.0x mode, set to 2.5x.

Which other cpus are you referring to ?

weedeewee wrote on 2024-02-15, 18:46:

Yes it is mentioned. […]
Show full quote

Sphere478 wrote on 2024-02-15, 18:02:

weedeewee wrote on 2024-02-15, 17:45:

It helps if you add exactly which ones you are referring to as 'more'.

The table is being updated. This will take a while. You’ll see. For one, 1x isn’t mentioned for cyrix

Yes it is mentioned.

For 1.0x mode, set to 2.5x.

Which other cpus are you referring to ?

Ah. Thanks. I see that now.

I’ve filled out a few others, still going back and forth and verifying/adding. In the middle of some other stuff right now so am working on this sporadically.

BTW I recall that site you linked from some years back part of the reason I started this thread is I recalled that site didn’t have all the multipliers for some chips, but taking a closer look at it today I am seeing more comprehensive accounting than I had recalled. I wonder if the curator may have updated it in recent months/ years. It is actually not bad, 🤣 kinda making me think this thread is pointless 🤣. So far I have been filling this out mostly referencing my own memory/testing/threads with a few referencing to wiki.

I do have some info on tillamooks that I haven’t found over there on that site yet. Still looking at data there and comparing.

I see they mentioned the usless pins on overdrive. I can expand on that a little but that’s essentially correct.

Sphere478 wrote on 2024-02-15, 19:21:

Ah. Thanks. I see that now. […]
Show full quote

weedeewee wrote on 2024-02-15, 18:46:

Yes it is mentioned. […]
Show full quote

Sphere478 wrote on 2024-02-15, 18:02:

The table is being updated. This will take a while. You’ll see. For one, 1x isn’t mentioned for cyrix

Yes it is mentioned.

For 1.0x mode, set to 2.5x.

Which other cpus are you referring to ?

Ah. Thanks. I see that now.

I’ve filled out a few others, still going back and forth and verifying/adding. In the middle of some other stuff right now so am working on this sporadically.

BTW I recall that site you linked from some years back part of the reason I started this thread is I recalled that site didn’t have all the multipliers for some chips, but taking a closer look at it today I am seeing more comprehensive accounting than I had recalled. I wonder if the curator may have updated it in recent months/ years. It is actually not bad, 🤣 kinda making me think this thread is pointless 🤣.

I do have some info on tillamooks that I haven’t found over there yet. Still looking at data there and comparing.

Which Site? and regarding the pointlessness... you could just be verifying the veracity of the available information by doing your own research and making your own tables.

Yeah, good point. Peer review is valuable 😀

https://www.pchardwarelinks.com/cpuspeed.htm

Oh, H3nrik V! linked to that site in the other thread.

Got a good amount of info up now, not done yet, see any errors? Got any extra info? Will work on this more tonight.

Sphere478 wrote on 2024-02-15, 14:06:

I’m going to try and construct this first post into a comprehensive guide for possible multipliers on this socket series. I’ll f […]
Show full quote

I’m going to try and construct this first post into a comprehensive guide for possible multipliers on this socket series. I’ll fill in a guide from memory if those of you with the cpus on hand can confirm the missing possible multipliers please comment and I will update.

How this works:
There are four BF pins on these cpus for programming the multiplier registers, for the purposes of this thread I will refer to bf2 (Intel) and BF2 (AMD) specifically as these are physically two different pin locations. Not all cpus used all of these pins, for programming the registers.

Cyrix 6x86
Uses BF0, BF1

1=on 0=off

Cyrix mII 2.9v this info is verified
Uses BF0, BF1, BF2 (AMD)

1=on 0=off
BF0, BF1, BF2(AMD)
0, 0, 0 3.5x
1, 0, 0 2.0x
0, 1, 0 3.0x
1, 1, 0 2.5x
0, 0, 1 1.0x
1, 0, 1 4.0x
0, 1, 1 1.0x
1, 1, 1 4.0x
Re: Cyrix 400gp multiplier settings

Cyrix mII 2.2v this info is verified
Uses: BF0, BF1, BF2 (AMD)

1= on 0 = off
BF0, BF1, BF2
? ? ? = 1x appears to have been removed from 2.2v versions.
1, 0, 0 = 2x
1, 1, 0 = 2.5x
0, 1, 0 = 3x
0, 0, 0 = 3.5x
1, 0, 1/ 1 1 1 = 4x
Re: Cyrix 400gp multiplier settings

P54c 1.5x 2x
Uses: BF0

BF0
0= 1.5x
1= 2x

P54cs 1.5x 2x 2.5x 3x
Uses: BF0, BF1

BF0, BF1
0, 1 = 1.5x
1, 0 = 2x
1, 1 = 2.5x

P55c
Uses BF0, BF1
2x
2.5x
3x
3.5x

The configuration for the various multipliers varies from chip to chip on pentium MMX as some of these had their multipliers locked, and scrambled.
But it is supposed to be:
BF0, BF1
1, 0 = 2x
1, 1 = 2.5x
0, 1 = 3x
0, 0 = 3.5x
Re: Pentium MMX Multipliers

Tillamook
Uses BF0, BF1, BF2(intel)

BF0, BF1, BF2

2x
2.5x
3x
3.5x
4x
4.5x
5x

Finding chips with 4.5x enabled is rare, and 5x has only been documented in intel datasheet but never shown in the wild to be functional.
Re: Tillamook 266MHz and working L2 cache?

P54 overdrive

MMX Overdrive
No adjustments possible
180, 200 mhz units are set permanently to 3x suspect through gold wire.
Re: Socket 5 / 7 Pentium Overdrives. Higher Multipliers? SMP? Let’s find out..

Winchip 1

Winchip 2

Rise 2.8?v this multiplier info is verified
Uses: BF0, BF1

BF0, BF1
0,0 = 3.5x
1,0 = 2x
0,1 = 3x
1,1 = 2.5x
Rise cpu voltage and multiplier settings

Rise 2.1?v this multiplier info is verified
Uses: BF0, BF1

BF0, BF1
0,0 = 3.5x
1,0 = 2x
0,1 = 3x
1,1 = 2.5x
Rise cpu voltage and multiplier settings

AMD k5
Doesn’t use BF pins
It’s a bit of an oddball, pr 75-133 uses a 1.5x multiplier, 166 uses a 1.75x multiplier, and 200 uses a (help me out here)

AMD k6

AMD k6-2 early
2x 2.5x 3x 3.5x 4x 4.5x 5x 5.5x

AMD K6-2 late and k6-3
Utilizes pins: bf0, bf1, bf2(AMD)

2.5x
3x
3.5x
4x
4.5x
5x
5.5x
6x

AMD K6-2+/3+

This CPU supports software setting of multiplier without need to reset. This over rides hardware set multiplier.

Hardware multiplier is set at post software is set after boot using a program.

Hardware multipliers available:
2.5x ? Verify needed
3x
3.5x
4x
4.5x
5x
5.5x
6x

Software supports all those but adds 2x and 1.5x (verify needed)

Still filling this in.

Hi, very interesting compliments, for my part I have various CPUs in my collection, including sockets 5 and 7, I have a couple of IDT C6 200s, and various K5s, even a 5K86 75 which would be the first version of the K5.
Going back to the K5, they work like this, the 166 has a 1.75X multi, to select it you have to put the MB jumpers as if it were a 2.5X, I don't have the 200 which has a 2X multi, to select it you have to put the jumpers as if it were a 3X.
The settings for 166 also apply to 150 (change FSB 60).