Asus P4B266 User Manual page 18

ATX 12V connector. This power connector connects the 4-pin 12V
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plug from the ATX 12V power supply.
CPU socket. A 478-pin surface mount, Zero Insertion Force (ZIF)
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socket called mPGA478 B. This socket accommodates the Intel
Pentium
North bridge controller. This controller called the Intel Memory
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Controller Hub (MCH) is one of the two major components of the
Intel 845D (Brookdale) chipset. The MCH and the south bridge Intel
I/O Controller Hub 2 (ICH2) are interconnected through the Intel
proprietary Hub interface. The MCH provides the processor
interface, memory interface, AGP interface, and Hub Interface.
DDR DIMM sockets. These three 184-pin DIMM sockets support
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up to 2GB using unbuffered ECC or non-ECC PC2100/1600 DDR
DIMMs.
ATX power connector. This 20-pin connector connects to an ATX
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+12V power supply. The power supply must have at least 1A on the
+5V standby lead (+5VSB).
AGP warning LED. Serving as a smart burn-out protection for the
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motherboard, this red LED lights up if you plug in any 3.3V AGP
card into the AGP slot. When this LED is lit, there is no way you
can turn on the system power even if you press the power button.
ASUS EZ Plug™ Auxilliary +12V connector. This ASUS patented
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auxilliary power connector is used if you don't have an ATX +12V
power supply. Connect a 4-pin device connector from a standard
power supply to this connector to provide sufficient power to the
CPU.
IDE connectors. These dual-channel bus master IDE connectors
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support up to four Ultra DMA/100/66, PIO Modes 3 & 4 IDE
devices. Both the primary (blue) and secondary (black) connectors
are slotted to prevent incorrect insertion of the IDE ribbon cable.
Floppy disk connector. This connector accommodates the
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provided ribbon cable for the floppy disk drive. One side of the
connector is slotted to prevent incorrect insertion of the floppy disk
cable.
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4 478/Northwood Processor with 400MHz system bus.
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Chapter 1: Product introduction
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