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The motherboard of Intel D845PEBT2

Evgenie Rudometov, Victor Rudometov.

The corporation of Intel on the basis of a popular chip set i845PE releases the motherboard of Intel D845PEBT2 in which architecture a number of perspective processing techniques is realised, including support of the forced functional modes of the central processor unit. This card is oriented to creation of the high-powered computer systems which basis is made by processors of NetBurst architecture with processing technique Hyper-Threading.


As is known, dependability, stability and functionality of the computer are in many respects defined by the motherboard.

Now in the computer market various products of the big number of manufacturers of this type of accessories are presented. However the measurement standard of dependability and stability of a steel of a product of the corporation of Intel.

One their recently released models of the motherboards created on the basis of a popular chip set of Intel 845PE, the card of Intel D845PEBT2 is.

Being very difficult product created with usage of current technologies, the given chip set possesses the successful architecture and an integration high-scale. It provides not only productivity high level, but implementation of the big number of controllers of peripheral devices, as has been realised by experts in the motherboard of Intel D845PEBT2.


Intel chip set 845PE the motherboard of Intel D845PEBT2


Fig. 1. Structure of the computer created on the basis of a chip set i845PE


Intel chip set 845PE (i845PE) is developed on a basis before the released sets of specialised logic of Intel 845 (i845) and Intel 845Е (i845E). The chip set i845PE is oriented to systems with processors of Intel of Pentium 4 and Intel Celeron of NetBurst architecture with Socket 478 plugs and with clock rate of bus FSB of type QPB of 100 and 133 MHz (Quad-Pumped Bus).

Bus FSB of type QPB at clock rate of 100 MHz carries out data transfer with frequency of 400 MHz, an address part — 200 MHz that capacity to 3,2 Gbytes/with provides peak. At clock rate of 133 MHz data transfer is carried out with frequency of 533 MHz, and an address part — 266 MHz. In this mode peak capacity reaches values of 4,2 Gbytes/with. The bus supports 32-bit addressing that provides to 4 Gbytes of dynamic storage.

Traditionally for line products i8xx the chip set consists of two components named Memory Controller Hub (MCH) and I/O Controller Hub (ICH). For other manufacturers of chip sets similar components are known as North Bridge and South Bridge.

Chips MCH and ICH are jointed by the special local bus which is traditional solution for link of components of chip sets of a series i8xx. This link is carried out by 8-bit wire Hub Link working on frequency of 66 MHz and supporting Hub Interface 1.5. This solution provides a transfer rate of 256 Mb per second.

The MCH component is presented by Intel chip 82845PE. It contains resources of interfaces of operation with the processor, AGP videoadapter, dynamic storage units, and also with chip I/O Controller Hub fulfilling traditional functions South Bridge.

Built in Intel 82845PE the controller of processor bus FSB of type QPB supports the bus with clock rate of 100/133 MHz that provides data transfer on frequencies of 400/533 MHz. It is necessary to mark, that a number of manufacturers of motherboards was released by products on the basis of Intel 82845PE in which operation of the processor bus with clock rate of 200 MHz is supported , that provides data transfer on frequency of 800 MHz and addresses on frequency of 400 MHz.

Built in Intel chip 82845PE the memory controller provides support: memories DDR SDRAM (Double Data Rate SDRAM — SDRAM with data transfer on lobbies and back edges of clock pulses of the bus of memory), DDR266/333, a maximum memory size — to 2 Gbytes, chips 64, 128, 256, 512 Mbit DDR SDRAM, Unbuffered units, unregistered 184 pin without ECC DDR. The maximum transfer rate makes to 2,1/2,7 Gbytes/with at DDR266/333.

The built in controller of a drawing supports one arrangement AGP which can work in modes AGP 2X/4X.

Handle of computer peripheral devices is carried out by the second component of a chip set. Thus it is necessary to mark, that in a chip set i845PE chip ICH of the fourth version is used. According to this fact it has received name ICH4 and is presented by Intel chip 82801DB ICH4. This chip enters into a base set of a chip set i845PE.

The built in resources of a chip of handle of peripheral devices of a base set support: two channels IDE with support ATA 33/66/100 (to four arrangements IDE), three controllers USB 2.0 (six ports), six PCI (32 bits/33 of MHz), LPC (Low Pin Count), AC ' 97 with support of 6 audiochannels (20-bit interface AC-Link), the integrated controller 10/100 Base-TX Ethernet, SMBas, ACPI 2.0, and also other resources and functions.


The main technical parametres of the motherboard of Intel D845PEBT2


Fig. 2. The Motherboard of Intel D845PEBT2


Fig. 3. Plugs of the motherboard of Intel D845PEBT2


The processor

  • Support of processors of Intel of Pentium 4, Intel Celeron with Socket 478 plugs and with FSB QPB 400/533 MHz, support of processing technique Hyper-Threading.

Chip set

  • Intel 82845PE (MCH) / Intel 82801DB (ICH4),
  • It is supported Ultra DMA 100/66/33,
  • Accelerated Graphics Port with support of modes AGP 4X (only 1,5 ).

Dynamic storage

  • Two plugs (184 contact electrodes) for dynamic storage DIMM (unbuffered Non-ECC DIMM), DDR 266 or DDR333, 2,5 In, maximum size — to 2 Gbytes,


  • Integrated 6-channel AC 97 CODEC. (AC ’ 97 Audio with SoundMAX Cadenza)

USB 2.0

  • About 6 ports USB 2.0 with a transfer rate to 480 Mbit/seconds are supported 


  • The integrated network controller 10/100M Ethernet (Intel 82562 ET LAN).

System BIOS

  • 4-Mb Flash EEPROM,
  • Autoconfiguration of IDE-arrangements,
  • Processing technique of Intel Rapid BIOS boot, accelerating POST-test passing (Power On Self Test).

Internal plugs

  • 1 x AGP slot, 5 x PCI slots,
  • 1 x Floppy port (supports arrangements in size to 2,88 Mb),
  • 2 x connector Ultra DMA 100/66/33,
  • 2 x USB 2.0 plug.

External plugs

  • 1 x PS/2 the keyboard, 1 x PS/2 the mouse,
  • 4 x USB 2.0 plug,
  • Network RJ45-LAN plug,
  • 1 parallel port (Parallel),
  • 1 serial port (COM),
  • Audio plugs (Line-In, Mic-In, Line-Out),

Monitoring of hardware,

  • Monitoring of powers and temperatures,
  • Automatic check of rotation of fans.

Form factor

  • ATX.

Package structure

Into package structure enter:

  • Box,
  • The motherboard,
  • The user manual in English;
  • Cables: one ATA66/100/133, one Serial ATA and a loop for hooking up of the flexible drive;
  • Stub on a card backboard;
  • Compact disc with the software into which drivers and a manual in format PDF enter.


The design of the motherboard of Intel D845PEBT2 as a whole corresponds to referens-design of similar products. As is known, the design forms and it is recommended the corporations developing and releasing sets of the system logic. In this case the given initiative belongs to the implementator of a chip set i845PE to Intel corporation.


Fig. 4. Resources of cooling of chip Memory Controller Hub (MCH)


The functional mode of memory modules DDR SDRAM as it is accepted and is realised now practically in all motherboards, DDR SDRAM can be or synchronous — clock rate coincides with frequency FSB, or asynchronous — clock rate differs from frequency FSB.

From features of the architecture it is necessary to mark presence of the controller of the sound realised on the basis of a popular chip set and codec AC ' 97 Analog Devices AD1980. It provides possibility of hooking up of audiosystems of a pattern 5.1.

As a part of the motherboard controller SATA RAID realised on the basis of chip Silicon Image Sil3112ACT144 is used. This controller provides possibility of creation RAID of levels 0 and 1 with SATA150 protocol support.

Except the specified controllers, it is necessary to mark presence of network tools. Their basis is the controller with support 10BaseT/100BaseTX. Integrated into structure of the motherboard of Intel D845PEBT2 network tools allow to include easily the computer through built in RJ45 (LAN plug in local area network structure.

From features of the architecture of the motherboard of Intel D845PEBT2 the built in impulse surge protector — VRM deserves a mention . Usually in motherboards fourline converters use three, and even. It allows to arrange uniformly load and to increase stability of operation. But the implementator of standards VRM and referens-design of motherboards with i845 set chip sets — Intel corporation has considered sufficient for the product of two-channel solution.

The power +5 In in mode Standby shows a light-emitting diode on the motherboard.

From the most interesting features of the motherboard of Intel D845PEBT2 it is necessary to mark a number of processing techniques which jointly did not use earlier in products of this corporation.

In the architecture of the motherboard by means of chip SMSC LPC47M172-NR possibilities of the hardware monitoring providing the control over supply voltages and operation of fans are realised. By the way, in the given card autocontrol of the fan which is responsible for temperature in a system unit is realised.

From other functionality it is necessary to mark fast loading. This is provided with processing technique of Intel Rapid BIOS boot. However, this feature is characteristic for many motherboards of the corporation of Intel.

However, since the card of Intel D845PEBT2, the corporation has taken off embargo from usage in the products of the forced modes. In this motherboard implementators according to traditions of the modern computer market realised central processor unit dispersal. However, the band of change of clock rate of the bus of the processor in the card of Intel D845PEBT2 is limited by values:-2 % of,-1 %, +1 %, +2 %, +3 %, +4 % from a rated frequency. This mode is named Burn-In Mode and is taken up a position only for the experts, experimenting different modes of maintenance of the given product, including central processor unit dispersal. Efficiency of the given modes providing rise of productivity of computers, the results of testing presented more low show.



Estimating operation parametres of the described motherboard, it is necessary to mark, that at performance of numerous, durable tests the card of Intel D845PEBT2 worked steadily as it usually and is characteristic for products of this manufacturer. Results of operation of tests CPUmark 99, 3DMark 2001 SE Pro are more low resulted.

In testing following components used:

  • The motherboard of Intel D845PEBT2 (i845PE),
  • The processor of Intel of Pentium 4 (Socket 478, 512 Kbytes of cache memory L2, 133 MHz FSB of type QPB) with clock rate 3,06 GHz,
  • Abit Siluro GeForce4 Ti4200 OTES videoadapter (64 Mb DDR SDRAM, CPU Core — 257 MHz, memory — 550 MHz),
  • Dynamic storage Hynix PC3200 (DDR400) 512 Mb,
  • IBM hard disk 180GXP 120 Gbytes (2 Mb of the cache memory, 7200 rpm),
  • OS OF WINDOWS XP Professional.


Fig. 5. Parametres of the processor of Intel of Pentium of 4 3,06 GHz working in a regular mode


Fig. 6. Parametres of the processor of Intel of Pentium of 4 3,06 GHz working in a mode of dispersal


Results of testing

3 GHz

3,2 GHz

CPUmark 99



3Dmark 2001 SE Pro




Fig. 7. Results of performance of test CPUmark 99


Fig. 8. Results of performance of the test 3DMark 2001 SE Pro


The card can be recommended a wide range of users which does not interest possibilities of extremal modes of dispersal both which prefer dependability and stability of operation.

The motherboard of Intel D845PEBT2 is given by the Moscow representation of the corporation of Intel.

It is published in log "the Computer the Price"

To pass to razrelu Motherboards and chip sets

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