The speed or frequency of a CPU is calculated by a simple formula:
Front Side Bus x Multiplier = CPU Frequency
In your case, your Intel Pentium 4 3.2Ghz CPU operates at a 200MHz (800Mhz quad-pumped) front side bus:
200Mhz FSB x 16 = 3.2Ghz
In the case of a 266 fsb, the formula would be 266Mhz FSB x 12 = 3192 or 3.2Ghz
Calculating CPU Speed
The CPU speed is based on two measurements, the Front Side Bus speed (FSB) and the clock multiplier. The CPU speed is set by taking the clock multiplier and multiplying it to the speed of the FSB.
Today most CPUs are processor locked (look carefully at exactly what chip/core you are buying). Meaning that the clock multiplier settings are built into the chip so the clock multiplier cannot be changed (even if you specify a different multiplier on your motherboard, it remains fixed on the CPU). This leaves you with one other way to overclock your computer, you can just increase your FSB
speed.
The FSB speed is not just the speed in which the CPU and motherboard communicate, it is the speed in which the whole motherboard will run. It also increases the speed for the PCI bus and memory access.
I suspect the difference in the fsb of 200 versus 266 has to do with the cpu model. Intel has three classes of P4 chips that are available in the 3.2Ghz speed (to see all the cpus and their corresponding steps-
<http://processorfinder.intel.com/scripts/default.asp?CHRID=483>
Pentium® 4 Processor 540 Supporting HT Technology†
Processor Number 540
Architecture 90 nanometer technology
L2 Cache 1M
L3 Cache N/A
Clock Speed 3.20 GHz
Front Side Bus Speed 800 MHz
Other Intel Technologies HT† Enabled
Package FC-LGA
Chipset Intel® 925X, 915 Chipsets
Memory Type Dual Channel DDR2 400,
DDR 400/333
Boards Compatible Boards (AttrID=131)
Slot/Socket Type SOCKET
Operating Voltage N/A
Min-Max Voltage 1.25-1.40
Pin Count 775-land
sSpec Number SL7J7
Pentium® 4 Processor Supporting HT Technology†
Processor Number N/A
Architecture 90 nanometer technology
L2 Cache 1M
L3 Cache N/A
Clock Speed 3.20E GHz
Front Side Bus Speed 800 MHz
Other Intel Technologies HT† Enabled
Package FC-PGA4
Chipset 865PE,
865G,
875P
Memory Type Dual Channel DDR, DDR
Boards Compatible Boards (AttrID=117)
Slot/Socket Type SOCKET
Operating Voltage N/A
Min-Max Voltage 1.25-1.40
Pin Count 478-pin
sSpec Number SL7B8
Pentium® 4 Processor Supporting HT Technology†
Processor Number N/A
Architecture 0.13 micron technology
L2 Cache 512 KB
L3 Cache N/A
Clock Speed 3.20 GHz
Front Side Bus Speed 800 MHz
Other Intel Technologies HT† Enabled
Package FC-PGA2
Chipset 865PE,
865G,
875P
Memory Type Dual Channel DDR, DDR
Boards Compatible Boards (AttrID=101)
Slot/Socket Type SOCKET
Operating Voltage N/A
Min-Max Voltage 1.475-1.55
Pin Count 478-pin
sSpec Number SL6WG
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