User Guide

Hardware Installation
2-12
AMD K6 CPU Core
Frequency
Ratio External
Bus Clock
S1 S2 S3 JP4,JP5,JP6,JP25
K6-166 166MHz = 2.5x 66MHz ON ON OFF 1-2 & 1-2 & 1-2 & 1-2
K6-200 200MHz = 3x 66MHz OFF ON OFF 1-2 & 1-2 & 1-2 & 1-2
K6-233 233MHz = 3.5x 66MHz OFF OFF OFF 1-2 & 1-2 & 1-2 & 1-2
K6-266 266MHz= 4x 66MHz ON OFF ON 1-2 & 1-2 & 1-2 & 1-2
K6-300 300MHz= 4.5x 66MHz ON ON ON 1-2 & 1-2 & 1-2 & 1-2
K6-2 333 333MHz 3.5x 95MHz OFF OFF OFF 2-3 & 1-2 & 2-3 & 2-3
K6-2 350 350MHz 3.5x 100MHz OFF OFF OFF 1-2 & 1-2 & 2-3 & 2-3
K6-2 366 366MHz 5.5x 66MHz OFF OFF ON 1-2 & 1-2 & 1-2 & 1-2
K6-2 380 380MHz 4x 95MHz ON OFF ON 2-3 & 1-2 & 2-3 & 2-3
K6-2 400 400MHz 4x 100MHz ON OFF ON 1-2 & 1-2 & 2-3 & 2-3
K6-2 450 450MHz 4.5x 100MHz ON ON ON 1-2 & 1-2 & 2-3 & 2-3
K6-III 400 400MHz 4x 100MHz ON OFF ON 1-2 & 1-2 & 2-3 & 2-3
K6-III 450 450MHz 4.5 100MHz ON ON ON 1-2 & 1-2 & 2-3 & 2-3
Note: Cyrix 6x86, 6x86MX (M2) and AMD K5 CPU use P-
rating for the reference of CPU benchmark compared with
INTEL P54C, their internal core frequency is not exactly equal
to P-rating marked on the CPU. For example, Cyrix P166+ is
133MHz but performance is almost equal to P54C 166MHz
and AMD PR133 is 100MHz but performance is almost equal
to INTEL P54C 133MHz.
2.2.3 DRAM Clock
JP23
1-2
2-3
JP24
1-2
2-3
DRAM CLK
CPU CLK
AGP CLK
JP23, JP24 are used to decide if DRAM
clock is synchronous with CPU or AGP
clock.
1 2 3
1 2 3
JP4
JP5
JP6
JP23
JP24
JP25
CPU CLK