Dell OptiPlex GX1p - Manual (Page 21)

Jumpers: Dell™ OptiPlex™ GX1p
= jumpered
= unjumpered
1 Either the 450 MHz or 400 MHz speed jumper pins must have a jumper plug installed.
2 As of April 19, 1999, the processor speed jumper was set at 266 MHz on Dell OptiPlex system boards shipped from the factory.
500MHZ Reserved for future options.
450MHZ 1 Jumpered when the microprocessor's internal speed is 450 MHz (see footnote 1).
400MHZ 1 Jumpered when the microprocessor's internal speed is 400 MHz (see footnote 1).
350MHZ Not supported on the GX1p.
333MHZ Not supported on the GX1p.
300MHZ Not supported on the GX1p.
266MHZ 2 Jumpered for 266 MHz (see footnote 2).
BUS66M
(default)
External system clock speed is 66 MHz when jumpered.
External system clock speed operates at 100 MHz when not jumpered.
BIOS (default) Reserved. Do not change.
PSWD (default) The password features are enabled.
The password features are disabled.