Asus P5-99B - Manual (Page 19)

III. HARDWARE SETUP
ASUS P5-99B User’s Manual 19
Motherboard Settings
III. H/W SETUP
6. CPU BUS Frequency Setting (DIP 2 – Switches 1, 2, 3, 4)
This option tells the clock generator what frequency to send to the CPU, chipset,
and AGPset. This allows the selection of the CPU’s External frequency (or BUS
Clock). The BUS Clock multiplied by the BUS Ratio equals the CPU's Internal
frequency (the advertised CPU speed).
NOTE: You may set the memory speed
independently from the CPU Bus Frequency. Depending on your memory type,
PC66 (66MHz) ot PC100 (100MHz), select the appropriate “RAM” speed along
with the appropriate “CPU” speed.
7. Memory Transfer Mode Setting (DIP 2 – Switch 5)
The memory clock frequency can be set to be in asynchronous or synchronous
mode with respect to the CPU bus frequency.
P5-99B
CPU Bus Frequency Setting
75MHz
75MHz
37MHz 66MHz
66MHz
33MHz
100MHz
100MHz
33MHz
CPU
SDRAM
PCI
112MHz
112MHz
37MHz
105MHz
105MHz
35MHz
0 1
90MHz
90MHz
30MHz 95MHz
95MHz
32MHz
75MHz
100MHz
37MHz
66MHz
100MHz
33MHz
100MHz
66MHz
33MHz
CPU
SDRAM
PCI
112MHz
74MHz
37MHz
105MHz
70MHz
35MHz
90MHz
60MHz
30MHz 95MHz
63MHz
32MHz
DIP 2
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CPU
SDRAM
PCI
CPU
SDRAM
PCI
(SYNC)
(SYNC)
(ASYNC)
(ASYNC)