infiniteclouds wrote:

This is that chip from the bottom left --

Thanks. I can't find the datasheet for W48S87-27AH but I did find W48S87-27A and W127/W127-A. The former does have 60MHz and 90MHz settings but it lacks 95 and 124, so it's not the same as yours. The latter is an updated version of the former but it only has the 8 frequencies you listed above:

Not sure if the combinations can match the jumper settings on your boards manual. Interestingly it uses 2/3 and 1/3 divider for AGP and PCI at 83MHz.
All three chips have 48 pins, so I reckon it's unlikely for yours to have any hidden combinations.

They do match -- page 30: http://www.philscomputerlab.com/uploads/3/7/2 … x59pro-ol-e.pdf

That's a shame -- I was hoping for 50FSB -- as even some Slot 1's can do this. Thanks for checking in any case!

The W127 PLL is used in other (presumably later) versions of the AX59 Pro. I suspect it's a complete drop-in replacement for the -27AH.

infiniteclouds wrote:

They do match -- page 30: http://www.philscomputerlab.com/uploads/3/7/2 … x59pro-ol-e.pdf

That's a shame -- I was hoping for 50FSB -- as even some Slot 1's can do this. Thanks for checking in any case!

No problem! Thanks for contributing to this thread 😁

ASUS P2B-B Rev. 1.02
W83194R-39A

HOT-569/A
ICS9148BF-04

Stolen from

Kamerat wrote:

The Gigabyte GA-6EM have a clock generator capable of 33MHz FSB, the PLL52C66-05. You might have to modify the board to get access to the lowest clocks.

It goes from 33MHz all the way up to 100MHz.

GA-5AX rev 3.0
ICS9148BF-36

DTK PAM-0055I-E0
ICS9159M-14
Same as ATC-1000+.

Epox P55VPX, P55-BT
PLL52C62-01XC

Epox P55VP2
PLL52C61-01SC
Clock generators on Socket 7 and older motherboards

PC-Chips M571
CMA8865-27

ECS Me5PI-S
MX8315PC

ExpertColor TX531
9148BF-04

I wonder if there's another revision of the board as the 55MHz FSB setting in the manual gives 83,3MHz with 33,3MHz PCI.

Soyo 5AXE
9148BF-04

Got my hands on a FIC PA-2011 Rev. 2.5. Apparently the board's design included 6 models of clock generators and FIC decided to print all of their settings on the board. Mine has W48C67-01H on it, and besides the 4 printed ones, I tested the following settings:
CLK1 CLK2 CLK3 Freq
1-2 1-2 2-3 68
2-3 1-2 2-3 60
1-2 2-3 2-3 no boot
2-3 2-3 2-3 no boot
The other 5 models are:
IMI671
CY2277
W48C67-71
IMI652
ICS9147-01

Found another IC I didn't see mentioned here:
MCNIX (Macronix International) MX8325-1
On a LS-486e rev D socket 3 labeled "MX8325MC"
http://pdf.dzsc.com/88889/9931.pdf

PcChips M558
CY2265PVC-1

TULIP 486 DC/DT (TC38)
Interesting board. No explicit jumper for bus speed and the clock generator, ICD2023SC-2, is theoretically capable of "jumper-free overclocking".
Re: Need help identifying cache on 486 Motherboard

A 430VX board with Model Code No. 35832003
Link to the board's manual: http://support.pcpartner.com/support/man/intel/832003.pdf
Link to the original discussion: Subtle differences between Cyrix and IBM 6x86s

Clock generator: IMI SC653DYB

The board has documented two jumpers JP41 and JP42 that control the inputs on the S0 and S1 pins, and the reserved JP45 controls the input on the S2 pin.