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Pentium Interposers and Upgrades

Interposers
   Evergreen
   PowerLeap
     CPU Control Panel ("CCP")
     PL-54C/MMX
     PL-OD54C
     PL-MMX v2.01V
     PL-ProMMX (SVRM) v4.0
     PL-ProMMX (SVRM) v6.0
     PL-ProMMX Plus old version
     PL-ProMMX Plus v3.0
     PL-ProMMX Plus v4.0
     PL-K6-III
   Zerus P55C-K6-S1
   Madex Interposers
Upgrade Kits
   Kingston
     TurboChip 233
     TurboChip 400
   Evergreen Spectra 233/400
   Buffalo HP5-MMX300L
Clock and Multiplier Selection Pins (BF1 and BF0)
   Intel Pentium
   AMD K6

If you are planning to use AMD K6-2 CPU rated higher than 350 MHz for your system running Windows 95B or 95C you need amdk6upd.exe.

Content created by Sandy. Edited by Major Tom.

Interposers

Evergreen (Photo by MadMax)

Switch Settings

DIP switch settings to run a 233MMX chip:

PowerLeap

Official Website (archived)

Troubleshooting Guide for PL-ProMMX and PL-ProMMX Plus.

US5919259 Method and apparatus for supplying power to a CPU using an adaptor card (Google)
US5938769 CPU escalating adapter with multivoltage and multiple frequency selection (Google)

CPU Control Panel ("CCP") (Windows 95/98/NT)

A software utility that displays information about your CPU, Motherboard, Chipset, and BIOS. It enables you to configure your CPU settings.

CCP 5.1.0.1 (1.32MB)
CCP 5.0.0.27 (1.31MB)
CCP 4.0.0.29A (960KB)
   Last updated: Oct 2000
CCP 4.0.0.29 (960KB)
CCP 4.0.0.28 (940KB)
CCP 4.0.0.27 (680KB)
CCP4015.EXE (775KB)
CCP4013.EXE (863KB)
CCP403.EXE (837KB)
CPUPANEL.EXE (657KB)
   Version 3.0, Last updated: Dec 1998. Includes support for PL/586 write-back cache.
SETUP.EXE (510KB)
   Version 2.0, Last updated: Oct 1997

Using the PL-Pro/II Utility Software
User's Guide for CPU Control Panel Utility

PL-54C/MMX (manual) (Photo by MadMax)

Can be used to upgrade systems with Socket 4 (original 5V Pentium) to Socket 5/7 CPUs.

Not tested, but it should fit the Type 4 "P" and "Q" processor boards.

PL-OD54C

Upgrade for P75/90/100 systems to P133 to P200 (Non-MMX Upgrade).
Doesn't have a voltage regulator. It only provides clock multiplier jumpers for pin BF1 which is omitted in P75/90 systems. Very simple and easy to use. You actually don't need this interposer to upgrade P75/90 to classic Pentium 133-200, if you don't mind reworking the board (check Peter's P90 tuning page for the method).

This one can be used on the Type 4 P90 "Y" complex.

Switch Settings

PL-MMX v2.01V

Upgrade for Pentium 75-200 to MMX Pentium, K6 and M2.
Available CORE VCC; 3.3V, 3.1V, 2.8V, 2.1V
Maximum CORE/BUS ratio is 3.5 x (MMX 233 & K6-2 333)

This interposer won't fit on the Server 320 planar because of a large heatsink that sits in front of the CPU sockets.
It will work on the P90 "Y" complex, but you will have to bend fins of the LT11084 heatsink to make enough space for the interposer.

Tam's take on using this interposer with the T4 Y complex can be found HERE.

Physical Compatibility

PL-ProMMX (SVRM) v4.0

It looks like PL-ProMMX Plus (below). Two capacitors are placed around Pin 1 (front edge) but the switch block is placed inside the Socket at CPU side like PL-MMX listed above.

Physical Compatibility

PL-ProMMX (SVRM) v6.0 (manual)

Looks similar to PL-ProMMX Plus v4.0. No capacitors at the pin 1 side, switch block on the TOP side, inside the CPU socket.

Not tested, but it should fit to PC Server 320 (both CPU sockets), P90 complex, PC750 and other machines.

PL-ProMMX Plus old version (manual)

Upgrade for Pentium 75-200 to Intel MMX233 and (up to) K6-2/366.
Covers Core Vcc from 1.6V to 3.5V with 0.1V stepping.

JP2, Jumper blocks for Core Vcc setting, and a can type capacitor locates in front of Pin 1. Overhang of PCB for these parts hits the Voltage regulator in front of 2nd CPU socket of 8640/MCA planar.
NO, it does not fit to 8640-MYR. It doesn't fit to the 2nd CPU socket but DOES fit to the 1st socket.
It can be used for PC750 too.

Physical Compatibility

		Front View (right) Jumper Block for Core voltage settings and a capacitor in front of the PCB may interferes with a heatsink of voltage regulator on a 8640-Mxx 2nd CPU socket and on a Type 4 Y P90 complex.
		Bottom View (left) Silkscreened "PL-ProMMX Plus REV 2.1" Rear View (right)

JP1 Settings: Clock Multiplier

JP2 Settings: CPU Voltage and Overheating Protection

Pins 11-12: CPU Overheating Protection)

PL-ProMMX Plus v3.0 (manual)

The PCB extends only to one side of the socket, similar to version 4.0. However the switches are on the TOP side of the board, inside the replacement CPU socket, rather than on the underside.

See PL-ProMMX Plus v4.0 for system compatibility info.

PL-ProMMX Plus v4.0 (manual)

Note: This model was later sold as just PL-ProMMX Plus sans the version number. So you better check how it looks, if you are planning to use it for the Type 4 "Y" P90 complex. The older version with the same name may not fit the complex. The latest model was sold with a heat sick/fan combo which is different compared the one pictured below.

Can be used to upgrade Pentium 75-200 systems to Pentium MMX 233, K6-2/400-450, and other newer CPUs. Wide selection of core voltages that covers most of Intel, AMD (except K6-III), IBM/Cyrix and IDT CPUs.

This one can be used for PC Server 320 8640 (both CPU sockets), Y complex, and PC750 6885/6886. No capacitor nor jumper block is located on the side with pin 1, thus the interposer doesn't interfere with the voltage regulator heatsink of the 320 planar and Y complex.

Physical Compatibility

Core voltage regulation is driven by the Fairchild RC5057 DC-DC Controller.

Power Supply Connector

Connector specs: 3-pin, 3.96 mm pitch, 1.14 mm square pin. Available from many different manufacturers, e.g. JST's VH series.

Pinout of the male connector soldered to the interposer PCB (top view, pin 1 closer to the CPU socket):

Switch Setting

SW1: Pins 1, 2 & 3 for Clock Multiplier

SW1: Pins 4, 5, 6, 7 & 8 (Core Voltage)

SW1: Pin 10 (CPU Overheating Protection)

SW1: Pin 9 - No comment for Pin 9 in the associated Manual. But there is a instruction for this pin SW in Installation Guide PDF for PL-K6-III. Don't know if Pin 9 actually works for this model or not. At least, in all sample diagrams for CPU setting show this pin in OFF position.

From PL-K6-III PDF:
   SW1: Pin 9 (Pin AL-1 Compatibility) Pin 9 of SW1 lets you enable/disable the pin signal for split-voltage detection. This function provides compatibility for certain HP Vectra and Biostar systems that check the signal.
   For split-voltage CPUs, certain HP Vectra (VL100 and VL5/133 Series 5 DT) systems and certain Biostar motherboards (8500TUD and M5ALA) check for the presence of a signal from pin AL-1. Unfortunately, these systems use the AL-1 pin signal differently: the signal must be disabled in order for the HP Vectra systems to function properly, while the Biostar motherboards need to detect the signal in order to boot.
   If your HP Vectra or Biostar system does not run properly with the PL-K6-III installed, try using pin 9 of the SW1 DIP switch to turn the AL-1 pin signal on/off. Pin 9 is set to ON by default--this setting allows Biostar systems to detect the pin signal and boot. For HP Vectra systems, changing the switch setting to OFF will disable the signal and allow the system to function. Most systems (including most HP Vectra systems and Biostar motherboards) will be unaffected by the pin AL-1 setting.

Pin 9: Pin AL-1 Compatibility

PL-K6-III

A further development of the PL-ProMMX Plus interposer. It brings official support for the AMD K6-III chips.

Multiple different revisions:

PL-K6-III/98 version 1.0
PL-K6-III version 2.1
PL-K6-III version 2.2
PL-K6-III version 2.3

Zerus P55C-K6-S1 (Photos by Jim Hall, Explanation by Jim)

"For those of you who haven't seen this upgrade, it consists of an interposer similar to the Madex, with a plug for a power tap used on 3 1/2" clone style floppy drives to handle the power requirements of the Intel (or any pin compatible) CPU. The cooling fan also draws its power from the same source."

Exactly the same product was also sold in Japan before. it was named as "Multimedia CPU Upgrade Kit". It was made of Taiwan and marked as "CE". I don't know this "CE" logo which can be seen many computer products manufactured in Taiwan.

1) Close View	2) Bottom View	3) On the Type 4 "Y"

4) Jumper Block	5) Jumper Settings	6) Jim's Proud 90MHz M95

Specifications

Socket 5 or 7
Voltage Supplied: 2.2V, 2.8V, 2.9V, 3.2V
Current rate: 15A for P55C-K6-S
Connection: 320 pin SPGA

3.3V single voltage for I/O and Core is not designated. Thus Jim set Core voltage to 3.2V and put his classic Pentium P166 with 3x speed jumper setting and set it on his Y complex. Y complex has 60 MHz OSC so his system actually run at 180 MHz.

Report to the news group from Jim Hall:
   "OK, ran a little windows program called CPU id, by Alexander Berezkin. It identifies the CPU as an Intel Pentium, brand name Genuine Intel.
Type ID = 0
Family ID = 5
Model ID = 2
Stepping ID = 12
Clock Frequency, Internal = 180 MHz"

Madex Interposers

Information about Madex Interposers for Socket 5 and 7 systems:

English: Product Page, Jumper Settings
German: Product Page, Jumper Settings (has some extra info)

Upgrade Kits

Kingston

TurboChip 233 (guide)

Kingston TurboChip 233 uses Intel MMX233 CPU.

Features:

• Powerful Intel® MMX enhanced microprocessor running at
• 233MHz processing speed.
• 32KB Level One (L1) Cache
• Onboard voltage regulator to interface with either 2.8V or 3.3V system motherboard automatically.
• Supports multimedia extensions instructions
• "Plug and Play" installation. No software drivers to install.

Unfortunately TurboChip 233 does not have CPU speed jumper and it will automatically set the clock multiplier to 3.5x. It is supposed that TurboChip 233 may not run on Y complex. Any experience?

TurboChip 200

TurboChip 200 uses AMD K6 200 MHz. Most possibly, It will be kicked out by system BIOS of Y complex.

TurboChip 400 (guide)

Turbochip 400 uses K6-II/400 CPU. Needless to say it's incompatible with Type 4 "Y" complex.

But it may run in PC Server 320/520 or PC750 6886.

Evergreen Spectra 233 (manufacturer)

Evergreen Spectra Install Disk (zipped image) (thx to Christian Holzapfel)

Not sure which CPU this unit uses, Intel MMX233 or K6. Anyway "233" means it may not work on Y complex.

There were several models rated 300 MHz to 400 MHz using K6-II CPUs like Kingston TurboChip.

I'm not sure but it seems Spectra upgrades do not have clock multiplier jumpers and they automatically set it to Max rating provided with the CPU used.

Buffalo HP5-MMX300L

CPU accelerator by Buffalo. Features Mobile Intel Pentium MMX @ 300 MHz on a PCB with a Socket 5/7 plug.

The Y complex can't boot with it. Works fine in the 6886.

Clock and Multiplier Selection Pins (BF1 and BF0)

Intel Pentium (from Intel Documents)

Multipling Pins

BUS Frequency Selection for P54C

Early Pentiums (P90 & P75) do not have BF1.

BUS Frequency Selection For P55C

AMD K6 (from AMD K6-2 Data Sheet)

BF[2:0] (Bus Frequency) - Inputs, Internal Pullups

Summary: BF[2:0] determine the internal operating frequency of the processor. The frequency of the CLK input signal is multiplied internally by a ratio determined by the state of these signals as defined in the Table below. BF[2:0] have weak internal pullups and default to the 3.5 multiplier if left unconnected.

Processor-to-Bus Clock Ratios

Sampled: BF[2:0] are sampled during the falling transition of RESET. They must meet a minimum setup time of 1.0 ms and a minimum hold time of two clocks relative to the negation of RESET.