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The motherboard of Intel D875PBZ

Evgenie Rudometov, Victor Rudometov.

Intel corporation rather recently releases the motherboard of Intel D875PBZ. The newest high-powered chip set of Intel 875P became a basis of this card. The Motherboard of Intel D875PBZ in which architecture perspective processing techniques are embodied, is oriented to creation of the high-powered computer systems which basis is made by processors of NetBurst architecture with processing technique Hyper-Threading.


Usually gaining the computer, users give the main attention to a central processor unit choice. Certainly, its architecture and clock rate are the important parametres. However for the processor it is necessary to provide the optimum behaviour of its operation set by appropriate chips, a part of the motherboard — bases of the architecture of the computer. For this reason experts and the tempted users pay the big attention to a choice of this major component of the computer defining functionality of all system. The central unit which is a basis of motherboards, the specialised set of system logic — a chip set is, as is known .

Now in the computer market various products of the big number of manufacturers of this type of accessories are presented. Their number already makes some tens. Products of these corporations differ the price, in parametres, a complete set, operation features. However, considering the limitations superimposed by high-frequency units, created on modern high technologies, motherboards are fulfilled according to referens-design. For the cards oriented to processors with NetBurst architecture, the implementator of referens-design of motherboards Intel corporation is. As is known, this corporation is the implementator and the largest manufacturer of the given processors, together with chip sets. All it has in aggregate made motherboards from Intel corporation the original sample. And cards are known dependability and stability measurement standard.

One their recently released models of the motherboards created on the basis of a popular chip set of Intel 875P, the card of Intel D875PBZ is.

Being very difficult product created with usage of current technologies, the given chip set possesses the most perfect architecture and an integration high-scale.

The motherboard of Intel D875PBZ is oriented to development of powerful workstations and high-powered desktop personal computers. She allows to realise all advantages of the architecture of processors of Intel of Pentium 4 with processing technique Hyper-Threading. High efficiency of the motherboard of Intel D875PBZ is reached thanks to support of the processor bus with a transmission frequency of the given 800 MHz and units of a two-channel subsystem of memory DDR400. Besides, given card supports interface Serial ATA 150 and processing technique of Intel RAID 0. In addition, in the given card support of the forced modes for the central processor unit is carried out.

Intel chip set 875P the motherboard of Intel D875PBZ


Fig. 1. Structure of the computer created on the basis of a chip set i875P


Intel chip set 875P (i875P), known earlier as Canterwood, is oriented to creation of workstations and high-powered desktop personal computers. It supports systems with processors of Intel of Pentium 4 with processing technique Hyper-Threading, 0,13 microns created on processing technique , hooked up through Socket 478 plug and working with bus FSB of type QPB (Quad-Pumped Bus) which clock rate can make 133 or 200 MHz. Usage of the models calculated for frequency of the bus of 100 MHz is possible .

Bus FSB of type QPB at clock rate of 133 MHz carries out data transfer with frequency of 533 MHz, an address part — 266 MHz that allows to reach peak capacity of 4,2 Gbytes/with. At clock rate of 200 MHz data transfer is carried out with frequency of 800 MHz, and an address part — 400 MHz. In this mode peak capacity reaches values of 6,4 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 — Memory Controller Hub (MCH) and I/O Controller Hub (ICH).

Chips MCH and ICH are jointed by special eight-bit Hub Link local bus to a transfer rate of 256 Mb per second.

MCH component is presented by Intel chip 82875P, containing resources of interfaces of operation with the processor, AGP videoadapter, dynamic storage units, and also with chip I/O Controller Hub.

Built in Intel 82875P the controller of processor bus FSB of type QPB supports the bus with clock rate of 100/133/200 MHz that provides data transfer on frequencies of 400/533/800 MHz.

Built in Intel chip 82875P the memory controller provides support: two-and one-channel functional modes of memory DDR SDRAM (Double Data Rate SDRAM — SDRAM with data transfer on lobbies and back edges of clock pulses of the bus of memory), DDR400/333/266, a maximum memory size — to 4 Gbytes, chips 128, 256, 512 Mbit DDR SDRAM, units both with ECC, and without ECC. In patterns with support ECC in a two-channel mode the bus of 144 bits, without support ECC — 128 bits uses   .

Chip MCH supports different frequency functional modes for processor and memory buses.

For a synchronous functional mode of memory DDR400 and frequency of the bus of 800 MHz probably usage of the mode providing raised productivity of a subsystem of memory, — processing techniques of Intel PAT (Performance Acceleration Technology). In this mode the delays linked to synchronisation are minimised.

The built in controller of a drawing supports one arrangement 0,8/1,5 In AGP 3.0, working in modes AGP 8х/4x.

From features of hub MCH it is necessary to mark, that in its architecture the special interface is provided, allowing to realise Gigabit Ethernet. Carrying over of these resources from ICH in MCH speaks insufficient capacity of the local bus jointing hubs MCH and ICH.

Handle of computer peripheral devices carries out the second component of a chip set. By the way, it is necessary to mark, that in a chip set i875P chip ICH of the fifth version according to what it has received name ICH5 is used and presented by Intel chip 82801ЕB. This chip enters into a base set of a chip set i875P.

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), two ports Serial ATA 150, eight ports USB 2.0, six PCI (32 bits/33 of MHz), LPC (Low Pin Count), AC ' 97 with support of three codecs of the audiochannels, integrated controller Ethernet 10/100 Base-TX, SMBas, ACPI 2.0, and also other resources and functions.

Except Intel 82801ЕB, usage of the expanded version of hub ICH5 — ICH5R is possible . This expanded variant is presented by Intel chip 82801ЕR which differs from the predecessor function RAID of level 0.


The main technical parametres of the motherboard of Intel D875PBZ


Fig. 2. The Motherboard of Intel D875PBZ


Fig. 3. Plugs of the motherboard of Intel D875PBZ


The processor

  • Support of processors of Intel of Pentium 4 with processing technique Hyper-Threading with the bus of 800 MHz or 533 MHz in 478-contact tank mPGA;
  • Support of processors of Intel of Pentium 4 with the bus of 533 MHz in 478-contact tank mPGA.

Chip set

  • Intel 82875P (MCH) / Intel 82801EB (ICH5R) / Intel 82802AC (FWH);
  • Two ports Serial ATA 150 c support of Intel RAID 0;
  • Ultra ATA 100/66 protocol;
  • Five PCI plugs;
  • Power management ACPI 1.0b;
  • Correspondence of specification PC2001.

Dynamic storage

  • Four plugs (184 contact electrodes) for dynamic storage DIMM, DDR 400 or DDR333, 2,5 In, mode ECC, maximum size — to 4 Gbytes is supported  ;
  • Support of one or two channels of dynamic storage.

USB 2.0

  • Six ports on a backboard (one schetverennyj and one dual plug);
  • Two ports on the front panel (a contact block for output to the front panel).


  • One general-purpose size 1,5 or 0,8 In AGP 3.0 with support of mode AGP 8X.


  • Audiosubsystem of standard Flex 6 on the basis of company Analog Devices codec AD1985 (under the order).


  • Integrated network controller Gigabit Ethernet (with the CSA-interface).

System BIOS

  • 8 Mбит Flash EEPROM with Intel/AMI BIOS;
  • Autoconfiguration of IDE-arrangements;
  • Processing technique of Intel Rapid BIOS boot, accelerating POST-test passing (Power On Self Test).

Internal plugs

  • One AGP slot, five PCI slots;
  • One Floppy port (supports arrangements in size to 2,88 Mb);
  • Two connectors Ultra DMA 100/66/33;
  • Two connectors Serial ATA 150;
  • Two USB 2.0 plugs.

External plugs

  • PS/2 The keyboard and PS/2 the mouse;
  • Six USB 2.0 plugs;
  • One network RJ45-LAN plug;
  • One parallel port (Parallel);
  • One serial port (COM);
  • Audioplugs (Line-In, Mic-In, Line-Out).

Monitoring of hardware

  • Monitoring of powers and temperatures;
  • Automatic check of rotation of fans (Intel Precision Cooling).

Form factor

  • ATX 2.30;
  • The sizes 23,75x24 see


Package structure

Into package structure enter:

  • Box;
  • The motherboard of Intel D875PBZ;
  • The cover plate of input/output corresponding to specification ATX;
  • The quick reference guide of the user in English;
  • Cable for hooking up ATA66/100/133, cables Serial ATA and a loop for hooking up of the flexible drive;
  • Compact disc with the software of Intel Express Installer on which are written the user manual, and also anti-virus package Norton Internet Security, the utility of Intel Active Monitor, ON RestoreIT! Lite, ON Diskeeper Lite, player RealONE Player and other software.


Features of the architecture and design of the motherboard of Intel D875PBZ

The design of the motherboard of Intel D875PBZ as a whole corresponds to referens-design. In this case, as it already was marked above, the given initiative belongs to the implementator of a chip set i875P, that is the corporation of Intel.

By the way, there are two patterns of the motherboard of Intel D875PBZ. Difference consists in the built in audioresources. In one variant of the card, it of corporation of Intel delivered to partners, is available the built in 6-channel audiosubsystem with codec Flex ADI 1985. In the friend, the simplified variant this audiosystem is absent.

The motherboard of Intel В875PBZ is oriented to application in high-powered systems. Usage of processors of Intel of Pentium 4 with processing technique Hyper-Threading and the bus of 800 MHz providing reaching of a maximum level of productivity therefore is recommended  . However usage and less efficient models is possible. It can be, for example, the processors calculated for the bus of 533 MHz and even of 400 MHz. Thus together with the motherboard of Intel В875PBZ application of models and without support of processing technique Hyper-Threading is possible. However together with this card can be maintained and models of processors Celeron though, it is necessary to recognise, that it does not provide the high levels of the productivity accessible to more efficient variants of processors and the given motherboard.

The functional mode of memory modules DDR SDRAM can be one-channel (3,2 Gbytes/c) or two-channel (6,4 Gbytes/c). The two-channel mode allows to receive completely depthbalanced system in the event that pass-bands of the processor bus and the memory bus coincide and make equal values — 6,4 Gbytes/with. Thus operation of memory modules DDR SDRAM can be or synchronous — clock rate coincides with frequency FSB, or asynchronous — clock rate differs from frequency FSB. It is set in BIOS Setup — SDRAM Frequency.

In case of a synchronous mode for frequency of the bus of 800 MHz and memory modules DDR400 usage of the mode providing raised productivity of a subsystem of memory is possible. This firm processing technique carries the name “Processing technique of Intel PAT” (Performance Acceleration Technology). The idea laying in its basis, consists in an expedition of passing of data through MCH at the expense of refusal superfluous in this case synchronisations. Thus will not be involved superfluous sinhronizatsionnye bufery in a chip set, and data are handled directly. By estimations of experts of Intel, the reached scoring makes 2-5 %.

Cредствами a chip set the mode of Intel RAID 0 (only for the operating system of Windows XP) is supported  . It is realised by means of two ports Serial ATA 150.


Fig. 4. Window Device Manager


The network controller Gigabit Ethernet realised on a chip of Intel 82547EI is built in the motherboard architecture (Kenai II CSA — Gigabit Ethernet). This controller is hooked up by means of the interface of Intel Communication Streaming Architecture to hub MCH. The given integrated network tools allow to include easily the computer through built in RJ-45 plug in local area network structure.


Fig. 5. Icon Gigabit Ethernet


In the architecture of the motherboard of Intel D875PBZ possibilities of the hardware monitoring providing the control over supply voltages and operation of cooling fans are used. Thus in the given card, as well as, for example, in Intel D875PBT2, autocontrol of the fan which is responsible for temperature in a system unit is realised. It became possible thanks to processing technique of Intel Precision Cooling.


Fig. 6. A window of Intel Active Monitor


From other features of the motherboard of Intel D875PBZ it is necessary to mark firm processing technique of fast loading of Intel Rapid BIOS boot. The given processing technique meets practically in all modern motherboards of Intel.

The motherboard of Intel D875PBZ has one more feature which is necessary for marking. It is possibility of usage of the forced modes — dispersal (overclocking). A band of change of clock rate:-2 % of,-1 %, +1 %, +2 %, +3 %, +4 % from frequency rating value. This mode is named Burn-In Mode. Presence of the given mode is taken up a position by the company of Intel for usage by the experts experimenting various functional modes of system, differing productivity, teploobrazovaniem, stability.



Estimating operation parametres of the described motherboard, it is necessary to mark, that at performance of numerous, durable tests the card of Intel D875PBZ 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 D875PBZ (i875P),
  • The processor of Intel of Pentium 4 (Socket 478, 512 Kbytes of cache memory L2, 133 MHz FSB of type QPB) with clock rate 3,0 GHz,
  • Abit Siluro GeForce4 Ti4200 OTES videoadapter (64 Mb DDR SDRAM, CPU Core — 257 MHz, memory — 550 MHz),
  • Dynamic storage Hynix PC3200 (DDR400) 1 Gbyte (2х512 Mb),
  • IBM hard disk 180GXP 120 Gbytes (2 Mb of the cache memory, 7200 rpm),
  • OS OF WINDOWS XP Professional.


Fig. 7. Parametres of the processor of Intel of Pentium of 4 3,0 GHz working in a regular mode


Fig. 8. Parametres of the processor of Intel of Pentium of 4 3,0 GHz working in a mode of dispersal


Results of testing

3DMark 2001 SE Pro

Usual mode


Dispersal PCI/AGP


Dispersal of +4 %


Dispersal of +4 % and PCI/AGP




Fig. 9. Results of performance of the test 3DMark 2001 SE Pro


Usual mode


Dispersal PCI/AGP


Dispersal of +4 % and PCI/AGP


Dispersal of +4 %




Fig. 10. Results of performance of test CPUmark 99

The card can be recommended a wide range of users which does not interest possibilities of extremal modes of dispersal and which prefer high levels of productivity, dependability and stability of operation of the computer.


The motherboard of Intel D875PBZ is given by the Moscow representation of the corporation of Intel.

It is published in log "the Computer the Price"

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