Asus P I-P55T2P4 User Manual - Page 16

III. INSTALLATION (Jumpers) III. INSTALLATION 7. CPU External (BUS) Frequency Selection (JP8, JP9, JP10) These jumpers tell 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). 8. CPU to BUS Frequency Ratio (JP11, JP12) 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. JP8 JP9 JP10 JP8 JP9 JP10 JP8 JP9 JP10 JP8 JP9 JP10 JP8 JP9 JP10 1 1 1 1 2 2 2 2 3 3 3 3 50MHz 55MHz 60MHz 66MHz CPU External Clock (BUS) Frequency Selection 1 2 3 75MHz JP11 JP12 JP11 JP12 JP11 JP12 JP11 JP12 Complete Names: Intel Pentium P54C, P55C-MMX AMD K5, K6 IBM/Cyrix 6x86, 6x86MX 1 1 2 2 3 3 P54C/K5 1.5x(3/2) 2.0x(2/1) P55C/K6/MX 3.5X(7/2) 2.0x(2/1) IBM/Cyrix 6x86 3.0x(3/1) 2.0x(2/1) CPU : BUS Frequency Ratio 1 2 3 2.5x(5/2) 2.5x(5/2) 1.0x(1/1) 1 2 3 3.0x(3/1) 3.0x(3/1) 4.0x(4/1) Set the jumpers by the Internal speed of the Intel, AMD, IBM, or Cyrix CPU as follows: CPU Model Intel Pentium Intel Pentium Intel Pentium Intel Pentium Intel Pentium Intel Pentium Intel Pentium Intel Pentium Intel Pentium AMD-K6-PR233 AMD-K6-PR200 AMD-K6-PR166 AMD-K5-PR133/100 AMD-K5-PR120/90 AMD-K5-PR75 Freq. 233MHz 200MHz 166MHz 150MHz 133MHz 120MHz 100MHz 90MHz 75MHz 233MHz 200MHz 166MHz 100MHz 90MHz 75MHz Ratio 3.5x 3.0x 2.5x 2.5x 2.0x 2.0x 1.5x 1.5x 1.5x 3.5x 3.0x 2.5x 1.5x 1.5x 1.5x B. Freq. 66MHz 66MHz 66MHz 60MHz 66MHz 60MHz 66MHz 60MHz 50MHz 66MHz 66MHz 66MHz 66MHz 60MHz 50MHz (BUS Freq.) JP10 JP9 JP8 [2-3] [1-2] [2-3] [2-3] [1-2] [2-3] [2-3] [1-2] [2-3] [1-2] [2-3] [2-3] [2-3] [1-2] [2-3] [1-2] [2-3] [2-3] [2-3] [1-2] [2-3] [1-2] [2-3] [2-3] [2-3] [2-3] [2-3] [2-3] [1-2] [2-3] [2-3] [1-2] [2-3] [2-3] [1-2] [2-3] [2-3] [1-2] [2-3] [1-2] [2-3] [2-3] [2-3] [2-3] [2-3] (Freq. Ratio) JP12 JP11 [1-2] [1-2] [2-3] [1-2] [2-3] [2-3] [2-3] [2-3] [1-2] [2-3] [1-2] [2-3] [1-2] [1-2] [1-2] [1-2] [1-2] [1-2] [1-2] [1-2] [2-3] [1-2] [2-3] [2-3] [1-2] [1-2] [1-2] [1-2] [1-2] [1-2] IBM/Cyrix6x86MX-PR233 200MHz 3.0x IBM/Cyrix6x86MX-PR200 166MHz 2.5x IBM/Cyrix6x86MX-PR166 150MHz 2.5x 66MHz 66MHz 60MHz [2-3] [1-2] [2-3] [2-3] [1-2] [2-3] [1-2] [2-3] [2-3] [2-3] [1-2] [2-3] [2-3] [2-3] [2-3] *IBM/Cyrix6x86-PR166+ 133MHz 2.0x 66MHz [2-3] [1-2] [2-3] [1-2] [2-3] *NOTE: Only IBM or Cyrix Rev 2.7 or later is supported on this motherboard (see next page). Bootup screen will show 6x86-P166+ with the Cyrix PR166+ installed on this motherboard. 10 ASUS P/I-P55T2P4 User's Manual