UKT Support logo

Home
What's New
Contact Us


Search the Site
powered by FreeFind

Acer
Advent
Amstrad
Apple
Canon
Compaq
CTX
Epson
Hewlett Packard
Mitsubishi/Apricot
Packard Bell
Other Manufact.

File Extensions
Humour
Links
Microsoft
Reference
Scanner Support



 


PB 850 M/Board - CPU Upgrade Info


Back to 850 Motherboard Main Page

This motherboard can accommodate the following CPUs:

  • Intel P54C/P55C: 75 - 233 MHz
  • Cyrix 6X86/6X86L, PR120+ - PR166+
  • Cyrix 6X86MX, PR133+ - PR233+
  • Cyrix MII: 266 - 300 MHz
  • IDT C6: 150 - 200 MHz
  • AMD K5
  • AMD K6: 266 MHz
  • AMD K6-2: 300 - 333 MHz

Zero Insertion Force (ZIF) socket. Uses the 321-pin Type 7 CPU Socket. Not keyboard switchable. Disable cache to slow down the system. The following tables contain settings for some of the more common CPUs.

* The "I/O Voltage" jumpers (JP5 & JP6) are only on revision B motherboard. Not on revision D.

AMD K5

CPU
Speed		Bus Speed
& Multiplier		MultiplierI/O Voltage*Core VoltageBus SpeedLinear Mode
JP17		PCI/ CPU
Bus Synch.
JP18
PR-7550 x 1.5JP1
JP2
JP3		Off
Off
Off		JP5
JP6		1-2
1-2		JP8
JP9
JP10
JP11		Closed
Closed
Closed
Closed		JP14
JP15
JP16		On
On
On		Open2-3
PR-9060 x 1.5JP1
JP2
JP3		Off
Off
Off		JP5
JP6		1-2
1-2		JP8
JP9
JP10
JP11		Closed
Closed
Closed
Closed		JP14
JP15
JP16		Off
On
On		Open2-3
PR-10066 x 1.5JP1
JP2
JP3		Off
Off
Off		JP5
JP6		1-2
1-2		JP8
JP9
JP10
JP11		Closed
Closed
Closed
Closed		JP14
JP15
JP16		 On
Off
On		Open2-3
PR-12060 x 2JP1
JP2
JP3		On
Off
Off		JP5
JP6		1-2
1-2		JP8
JP9
JP10
JP11		Closed
Closed
Closed
Closed		JP14
JP15
JP16		Off
On
On		Open2-3
PR-13366 x 2JP1
JP2
JP3		On
Off
Off		JP5
JP6		1-2
1-2		JP8
JP9
JP10
JP11		Closed
Closed
Closed
Closed		JP14
JP15
JP16		On
Off
On		Open2-3
PR-16666 x 2.5JP1
JP2
JP3		On
Off
On		JP5
JP6		1-2
1-2		JP8
JP9
JP10
JP11		Closed
Closed
Closed
Closed		JP14
JP15
JP16		On
Off
On		Open2-3

AMD K6

CPU
Speed		Bus Speed
& Multiplier		MultiplierI/O Voltage*Core VoltageBus SpeedLinear Mode
JP17		PCI/ CPU
Bus Synch.
JP18
166(Model 6)66 x 2.5JP1
JP2
JP3		On
Off
On		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Closed
Open
Open
Closed		JP14
JP15
JP16		On
Off
On		Open2-3
200(Model 6)66 x 3JP1
JP2
JP3		Off
Off
On		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Closed
Open
Open
Closed		JP14
JP15
JP16		On
Off
On		Open2-3
200(Model 7)66 x 3JP1
JP2
JP3		Off
Off
On		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Open
Open
Closed
Open		JP14
JP15
JP16		On
Off
On		Open2-3
233(Model 6)66 x 3.5JP1
JP2
JP3		Off
Off
Off		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Open
Open
Closed
Closed		JP14
JP15
JP16		On
Off
On		Open2-3
233(Model 7)66 x 3.5JP1
JP2
JP3		Off
Off
Off		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Open
Open
Closed
Open		JP14
JP15
JP16		On
Off
On		Open2-3
266(Model 7)66 x 4JP1
JP2
JP3		On
On
Off		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Open
Open
Closed
Open		JP14
JP15
JP16		On
Off
On		Open2-3
300(Model 7)66 x 4.5JP1
JP2
JP3		On
On
On		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Open
Open
Closed
Open		JP14
JP15
JP16		On
Off
On		Open2-3

Model 6 is .35m
Model 7 is .25m

AMD K6-2

Before installing a K6-2, ensure that you have upgraded the BIOS to at least version 1.07.

CPU
Speed		Bus Speed
& Multiplier		MultiplierI/O Voltage*Core VoltageBus SpeedLinear Mode
JP17		PCI/ CPU
Bus Synch.
JP18
26666 x 4JP1
JP2
JP3		On
On
Off		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Open
Open
Closed
Open		JP14
JP15
JP16		On
Off
On		Open2-3
300**66 x 4.5JP1
JP2
JP3		On
On
On		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Open
Open
Closed
Open		JP14
JP15
JP16		On
Off
On		Open2-3
333***66 x 5JP1
JP2
JP3		Off
On
On		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Open
Open
Closed
Open		JP14
JP15
JP16		On
Off
On		Open2-3

** 66 MHz bus only. AMD shipped the K6-2/300 in both 100 MHz bus and 66. This motherboard doesn’t support 100 MHz.
*** 66 MHz bus only. AMD shipped the K6-2/333 in both 95 MHz bus and 66. This motherboard doesn’t support 95 MHz.

Cyrix 6x86

CPU
Speed		Bus Speed
& Multiplier		MultiplierI/O Voltage*Core VoltageBus SpeedLinear Mode
JP17		PCI/ CPU
Bus Synch.
JP18
PR-120+
100 MHz		50 x 2JP1
JP2
JP3		On
Off
Off		JP5
JP6		1-2
1-2		JP8
JP9
JP10
JP11		Closed
Closed
Closed
Closed		JP14
JP15
JP16		On
On
On		Closed2-3
PR-150+
120 MHz		60 x 2JP1
JP2
JP3		On
Off
Off		JP5
JP6		1-2
1-2		JP8
JP9
JP10
JP11		Closed
Closed
Closed
Closed		JP14
JP15
JP16		Off
On
On		Closed2-3
PR-166+
133 MHz		66 x 2JP1
JP2
JP3		On
Off
Off		JP5
JP6		1-2
1-2		JP8
JP9
JP10
JP11		Closed
Closed
Closed
Closed		JP14
JP15
JP16		On
Off
On		Closed2-3
PR-200+
150 MHz		75 x 2JP1
JP2
JP3		On
Off
Off		JP5
JP6		1-2
1-2		JP8
JP9
JP10
JP11		Closed
Closed
Closed
Closed		JP14
JP15
JP16		Off
On
Off		Closed1-2

Note: Some versions of the 6x86 have a Core and I/O voltage of 3.3V instead of the 3.5V listed above. Ensure which voltage is needed (it should be listed on the CPU itself), and change the voltage if necessary.

Cyrix 6x86L

CPU
Speed		Bus Speed
& Multiplier		MultiplierI/O Voltage*Core VoltageBus SpeedLinear Mode
JP17		PCI/ CPU
Bus Synch.
JP18
PR-120+
100 MHz		50 x 2JP1
JP2
JP3		On
Off
Off		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Open
Open
Open
Closed		JP14
JP15
JP16		On
On
On		Closed2-3
PR-150+
120 MHz		60 x 2JP1
JP2
JP3		On
Off
Off		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Open
Open
Open
Closed		JP14
JP15
JP16		Off
On
On		Closed2-3
PR-166+
133 MHz		66 x 2JP1
JP2
JP3		On
Off
Off		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Open
Open
Open
Closed		JP14
JP15
JP16		On
Off
On		Closed2-3
PR-200+
150 MHz		75 x 2JP1
JP2
JP3		On
Off
Off		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Open
Open
Open
Closed		JP14
JP15
JP16		Off
On
Off		Closed1-2

Cyrix 6x86MX

CPU
Speed		Bus Speed
& Multiplier		MultiplierI/O Voltage*Core VoltageBus SpeedLinear Mode
JP17		PCI/ CPU
Bus Synch.
JP18
PR-166
133 MHz		66 x 2JP1
JP2
JP3		On
Off
Off		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Closed
Open
Open
Closed		JP14
JP15
JP16		On
Off
On		Closed2-3
PR-166
150 MHz		60 x 2.5JP1
JP2
JP3		On
Off
On		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Closed
Open
Open
Closed		JP14
JP15
JP16		Off
On
On		Closed2-3
PR-200
150 MHz		75 x 2JP1
JP2
JP3		On
Off
Off		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Closed
Open
Open
Closed		JP14
JP15
JP16		Off
On
Off		Closed1-2
PR-200
166 MHz		66 x 2.5JP1
JP2
JP3		On
Off
On		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Closed
Open
Open
Closed		JP14
JP15
JP16		On
Off
On		Closed2-3
PR-233
188 MHz		75 x 2.5JP1
JP2
JP3		On
Off
On		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Closed
Open
Open
Closed		JP14
JP15
JP16		Off
On
Off		Closed1-2

Cyrix MII

CPU
Speed		Bus Speed
& Multiplier		MultiplierI/O Voltage*Core VoltageBus SpeedLinear Mode
JP17		PCI/ CPU
Bus Synch.
JP18
266
 200 MHz		66 x 3JP1
JP2
JP3		Off
Off
On		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Closed
Open
Open
Closed		JP14
JP15
JP16		On
Off
On		Closed2-3
300
225 MHz		75 x 3JP1
JP2
JP3		Off
Off
On		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Closed
Open
Open
Closed		JP14
JP15
JP16		Off
On
Off		Closed1-2
300
233 MHz		66 x 3.5JP1
JP2
JP3		Off
Off
Off		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Closed
Open
Open
Closed		JP14
JP15
JP16		On
Off
On		Closed2-3
333
263 MHz		75 x 3.5JP1
JP2
JP3		Off
Off
Off		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Closed
Open
Open
Closed		JP14
JP15
JP16		Off
On
Off		Closed1-2

IDT WinChip C6

CPU
Speed		Bus Speed
& Multiplier		MultiplierI/O Voltage*Core VoltageBus SpeedLinear Mode
JP17		PCI/ CPU
Bus Synch.
JP18
180
(3.3V)		60 x 3JP1
JP2
JP3		Off
Off
On		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Closed
Open
Closed
Closed		JP14
JP15
JP16		 Off
On
On		Open2-3
180
(3.52V)		60 x 3JP1
JP2
JP3		Off
Off
On		JP5
JP6		1-2
1-2		JP8
JP9
JP10
JP11		Closed
Closed
Closed
Closed		JP14
JP15
JP16		Off
On
On		Open2-3
200
(3.3V)		66 x 3JP1
JP2
JP3		Off
Off
On		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Closed
Open
Closed
Closed		JP14
JP15
JP16		On
Off
On		Open2-3
200
(3.52V)		66 x 3JP1
JP2
JP3		Off
Off
O		JP5
JP6		1-2
1-2		JP8
JP9
JP10
JP11		Closed
Closed
Closed
Closed		JP14
JP15
JP16		On
Off
On		Open2-3
225
(3.3V)		75 x 3JP1
JP2
JP3		Off
Off
On		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Closed
Open
Closed
Closed		JP14
JP15
JP16		Off
On
Off		Open1-2
225
(3.52V)		75 x 3JP1
JP2
JP3		Off
Off
On		JP5
JP6		1-2
1-2		JP8
JP9
JP10
JP11		Closed
Closed
Closed
Closed		JP14
JP15
JP16		Off
On
Off		Open1-2
240
(3.3V		60 x 4JP1
JP2
JP3		On
On
Off		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Closed
Open
Closed
Closed		JP14
JP15
JP16		Off
On
On		Open2-3
240
(3.52V)		60 x 4JP1
JP2
JP3		On
On
Off		JP5
JP6		1-2
1-2		JP8
JP9
JP10
JP11		Closed
Closed
Closed
Closed		JP14
JP15
JP16		 Off
On
On		Open2-3

Intel CPU

CPU
Speed		Bus Speed
& Multiplier		MultiplierI/O Voltage*Core VoltageBus SpeedLinear Mode
JP17		PCI/ CPU
Bus Synch.
JP18
7550 x 1.5JP1
JP2
JP3		Off
Off
Off		JP5
JP6		1-2
1-2		JP8
JP9
JP10
JP11		Closed
Closed
Closed
Closed		JP14
JP15
JP16		On
On
On		Open2-3
9060 x 1.5JP1
JP2
JP3		Off
Off
Off		JP5
JP6		1-2
1-2		JP8
JP9
JP10
JP11		Closed
Closed
Closed
Closed		JP14
JP15
JP16		Off
On
On		Open2-3
10066 x 1.5JP1
JP2
JP3		Off
Off
Off		JP5
JP6		1-2
1-2		JP8
JP9
JP10
JP11		Closed
Closed
Closed
Closed		JP14
JP15
JP16		On
Off
On		 Open 2-3
12060 x 2JP1
JP2
JP3		On
Off
Off		JP5
JP6		1-2
1-2		JP8
JP9
JP10
JP11		Closed
Closed
Closed
Closed		JP14
JP15
JP16		Off
On
On		 Open 2-3
13366 x 2JP1
JP2
JP3		On
Off
Off		JP5
JP6		1-2
1-2		JP8
JP9
JP10
JP11		Closed
Closed
Closed
Closed		JP14
JP15
JP16		On
Off
On		 Open2-3
15060 x 2.5JP1
JP2
JP3		On
Off
On		JP5
JP6		1-2
1-2		JP8
JP9
JP10
JP11		Closed
Closed
Closed
Closed		JP14
JP15
JP16		Off
On
On		Open 2-3
16666 x 2.5JP1
JP2
JP3		On
Off
On		JP5
JP6		1-2
1-2		JP8
JP9
JP10
JP11		Closed
Closed
Closed
Closed		JP14
JP15
JP16		On
Off
On		 Open 2-3
166 MMX66 x 2.5JP1
JP2
JP3		On
Off
On		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Open
Open
Open
Closed		JP14
JP15
JP16		On
Off
On		Open 2-3
20066 x 3JP1
JP2
JP3		Off
Off
On		JP5
JP6		1-2
1-2		JP8
JP9
JP10
JP11		Closed
Closed
Closed
Closed		JP14
JP15
JP16		On
Off
On		Open 2-3
200 MMX66 x 3JP1
JP2
JP3		Off
Off
On		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Open
Open
Open
Closed		JP14
JP15
JP16		On
Off
On		Open2-3
233 MMX66 x 3.5JP1
JP2
JP3		Off
Off
Off		JP5
JP6		2-3
2-3		JP8
JP9
JP10
JP11		Open
Open
Open
Closed		JP14
JP15
JP16		On
Off
On		Open2-3