Asus P I-P55TP4N User Manual - Page 16

JP26 JP27 JP28 JP26 JP27 JP28 JP26 JP27 JP28 III. INSTALLATION (Jumpers) III. INSTALLATION 5. CPU External (BUS) Frequency Selection (JP26, 27, 28) These jumpers tells the clock generator what frequency to send to the CPU. These allow the selection of the CPU's External frequency (or BUS Clock). The BUS Clock times the BUS Ratio equals the CPU's Internal frequency (the advertised CPU speed). 6. CPU to BUS Frequency Ratio (JP14, 15) These jumpers set the frequency ratio between the Internal frequency of the CPU and the External frequency (called the BUS Clock) within the CPU. These must be set together with the above jumpers CPU External (BUS) Frequency Selection. 1 1 1 2 2 2 3 3 3 66MHz 60MHz 50MHz CPU External Clock (BUS) Frequency Selection JP14 JP14 JP14 JP14 JP15 JP15 JP15 JP15 1.5 x 2.0 x 2.5 x 3.0 x CPU : BUS Frequency Ratio (1.5x, 2.0x, 2.5x, 3.0x) Set the jumpers by the Internal speed of the Intel CPU as follows: Internal (CPU) 166MHz 150MHz Ratio External JP28 JP27 JP26 JP14 JP15 2.5x 66MHz [2-3] [1-2] [2-3] [short] [short] 2.5x 60MHz [1-2] [2-3] [2-3] [short] [short] 133MHz 120MHz 2.0x 66MHz [2-3] [1-2] [2-3] [open] [short] 2.0x 60MHz [1-2] [2-3] [2-3] [open] [short] 100MHz 90MHz 75MHz 1.5x 66MHz 1.5x 60MHz 1.5x 50MHz [2-3] [1-2] [2-3] [open] [open] [1-2] [2-3] [2-3] [open] [open] [2-3] [2-3] [1-2] [open] [open] 10 P/I-P55TP4N User's Manual