Asus P5A-B P5A-B User Manual - Page 16

R III. INST ALLATION Jumpers III. INSTALLATION 3. CPU External (BUS) Frequency Selection (FS0, FS1, FS2, FS3) 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). 4. CPU to BUS Frequency Multiple (BF0, BF1, BF2) 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 in conjunction with the jumpers for CPU External (BUS) Frequency Selection. FS3 FS2 FS1 FS0 FS3 FS2 FS1 FS0 FS3 FS2 FS1 FS0 FS3 FS2 FS1 FS0 1 2 3 CPU → AGP → PCI → 60MHz 60MHz 30MHz 66.8MHz 66.8MHz 33.4MHz 75MHz 75MHz 37.5MHz 75MHz 60MHz 30MHz 1 2 3 CPU → 83.3MHz AGP → 66.6MHz PCI → 33.3MHz 95MHz 63.3MHz 31.6MHz 100MHz 66.6MHz 33.3MHz 105MHz 70MHz 35MHz 1 2 3 CPU → 110MHz AGP → 73MHz PCI → 36.6MHz 115MHz 77.6MHz 38.3MHz 120MHz 80MHz 40MHz CPU External Clock (BUS) Frequency Selection BF2 BF1 BF0 BF2 BF1 BF0 BF2 BF1 BF0 BF2 BF1 BF0 P5A-B Match the Mult. (Multiple) column of the table on the opposite page to these CPU types: CPU A: AMD-K6-III,AMD-K6-2/400&faster CPU B: AMD-K6-2/380&slower, AMD-K6 CPU C: Intel Pentium P54C, AMD-K5 CPU D: Intel Pentium P55C, IBM/Cyrix 6x86MX, IBM/Cyrix M II CPU E: IBM/Cyrix 6x86, IBM/Cyrix 6x86L CPU F: IDT WinChip 2™ 1 2 3 CPU A →3.5x(7/2) CPU B →3.5x(7/2) CPU C →1.5x(3/2) CPU D →3.5x(7/2) CPU E →3.0x(3/1) CPU F →3.5x(7/2) 6.0x(6/1) 2.0x(2/1) 2.0x(2/1) 2.0x(2/1) 2.0x(2/1) 3.33x(10/3) 2.5x(5/2) 2.5x(5/2) 2.5x(5/2) 2.5x(5/2) 1.0x(1/1) 2.5x(5/2) 3.0x(3/1) 3.0x(3/1) 3.0x(3/1) 3.0x(3/1) - 3.0x(3/1) BF2 BF1 BF0 BF2 BF1 BF0 BF2 BF1 BF0 BF2 BF1 BF0 1 2 3 CPU A → 4.0x(4/1) CPU B → 4.0x(4/1) CPU C → - CPU D → - CPU E → - CPU F → 4.0x(4/1) 4.5x(9/2) 4.5x(9/2) - - - 4.5x(9/2) 5.0x(5/1) 5.0x(5/1) - - - 2.33x(7/3) CPU : BUS Frequency Multiple 5.5x(11/2) 5.5x(11/2) - - - 2.66x(8/3) WARNING! Frequencies above 100MHz exceed the specifications for the onboard chipset and are not guaranteed to be stable. The table on the following page is for general reference purposes only. Always refer to the instructions included with your CPU when possible. 16 ASUS P5A-B User's Manual