WARNING: This information is provided "as is" with no warranty. Use at your own risk!
This site is NOT affiliated with PB.

850 Common Jumpers - IDT WinChip C6 CPU

CPU Speed (MHz) Bus Speed (MHz)
& Multiplier		 Multiplier I/O Voltage* Core Voltage Bus Speed Linear Mode PCI/ CPU Bus Synchronization
180
(3.3V)

60 x 3

 JP1
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		 JP17 Open JP18 2-3
180
(3.52V)

60 x 3

 JP1
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		 JP17 Open JP18 2-3
200
(3.3V)

66 x 3

 JP1
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		 JP17 Open JP18 2-3
200
(3.52V)

66 x 3

 JP1
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		 JP17 Open JP18 2-3
225
(3.3V)

75 x 3

 JP1
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		 JP17 Open JP18 1-2
225
(3.52V)

75 x 3

 JP1
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		 JP17 Open JP18 1-2
240
(3.3V)

60 x 4

 JP1
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		 JP17 Open JP18 2-3
240
(3.52V)

60 x 4

 JP1
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		 JP17 Open JP18 2-3
* The "I/O Voltage" jumpers (JP5 & JP6) are only on revision B motherboard. Not on revision D.