IС7-G architecture from Abit

The processor

• Support of processors of Intel of Pentium 4 with processing technique Hyper-Threading with the bus 800, 533, 400 MHz in 478-contact tank mPGA.

• Intel 82875P (MCH) and Intel 82801ER (ICH5R);
• Two channels DDR400 with ECC and PAT;
• USB 2.0;
• Two ports Serial ATA 150 c support RAID 0;
• Ultra ATA 100/66/33 protocol;
• Five PCI plugs.

• Four plugs (184 contact electrodes) for dynamic storage DIMM, DDR 400, DDR333, DDR266 (2,5 In, 128/256/512/1024 Mbit, unbuffered), is supported mode ECC, maximum size — to 4 Gbytes;
• Support of one or two channels of dynamic storage.

• One general-purpose AGP plug (Accelerated Graphics Port) with 1,5 or 0,8 In AGP 3.0, providing support AGP Pro 50 with modes AGP 8X/4X.

Audio

• Audiosubsystem on the basis of 6-channel codec RealTeak ALC650 CODEC;
• 24 bits S/PDIF Input/Output.

• The integrated network controller of Intel CSA Gigabit (RJ45).

• Two channels (two connectors) Ultra DMA 100/66/33;

• Two channels (two connectors) Serial ATA 150 with RAID 0 through ICH5R;
• Two channels (two connectors) Serial ATA 150 with RAID 0/1 through Silicon Image PCI.

• Eight USB 2.0 with support of a transfer rate to 480 Mbit/with.

• IEEE1394 c support of a transfer rate 400/200/100.

• AWARD BIOS in FWH Flash EEPROM;
• SoftMenu for processor parametre setup;
• Plug-and-Play (PNP);
• Advanced Configuration Power Interface (ACPI);
• Desktop Management Interface (DMI);
• Write-Protect Anti-Virus function.

• One AGP slot;
• Five PCI slots.
• One Floppy port (supports arrangements in size to 2,88 Mb);
• Two Ultra ATA 100/66/33;
• Four Serial ATA 150;
• Two USB 2.0;
• Two IEEE1394a;
• CD-IN, AUX-IN;
• IrDA.

• PS/2 The keyboard and PS/2 the mouse;
• One parallel port (Parallel), a serial port (COM);
• S/PDIF In;
• S/PDIF Out;
• AUDIO1 (Rear-Left / Rear-Right, Center/Subwoofer);
• AUDIO2 (Mic-In, Line-In, Front-Left/Front-Right);
• Two USB 2.0, one IEEE1394;
• Two USB 2.0, one RJ-45 LAN.

• Monitoring of powers, temperatures and operation of fans;
• Support Wake Up by LAN, Modem Ring RTC Alarm, inclusion from the keyboard and the mouse;
• Support STR (Suspend to RAM).

• ATX.

Into package structure enter:

• Box;
• Motherboard Abit IC7-G;
• Compact disc with drivers and utilities
• Diskette with drivers Serial ATA;
• The user manual in English with short descriptions in different languages, including Russian;
• Cable (round) for hooking up of arrangements ATA 100/66;
• Cable (round) for hooking up of the flexible drive;
• Two cables for arrangements Serial ATA;
• Two adapters of power supply for arrangements Serial ATA;
• Adapter Serillel2;
• The cover plate of input/output corresponding to specification ATX;
• breket with two USB 2.0 plugs and with two IEEE1394 plugs.

The design of motherboard Abit IC7-G developed and released by Abit corporation, as a whole corresponds to the referens-design of similar products created and recommended by corporations, releasing sets of system logic.

As card Abit IC7-G is oriented to application in high-powered systems, therefore in the systems created on the basis of the given card, usage of processors of Intel of Pentium 4 with processing technique Hyper-Threading and the bus of 800 MHz is recommended  . It provides reaching of a maximum level of productivity. 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 motherboard Abit IC7-G created on the basis of a chip set i875P, 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 as one-channel (3,2 Gbytes/c), and two-channel (6,4 Gbytes/c). Thus first two DIMM slots of motherboard Abit IC7-G concern the first channel built in a chip set i875P the memory controller, last two — to the second channel.

It is necessary to mark, that the two-channel mode allows to receive completely depthbalanced system. It is provided 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.

The built in resources of the motherboard allow to change a standard set tajmingov ("SDRAM Cas Latency" and "Precharge to Active" (Trp), "Active to precharge" (Tras) and "Active to CMD" (Trcd), etc.).

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 processing technique realised in all products, created on a basis i875P, carries the name “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 %.

The design of the motherboard has a number of features.

First of all, it is necessary to mark processor Socket 478 plug. Unlike the previous models, for example, popular model Abit IT7-MAX2, processor Abit IC7-G plug will turn on 90 degrees (counter-clockwise). Its offset deep into the motherboard allows to use heat sinks of the big size.

One more feature of design Abit IC7-G are resources of cooling of chip MCH. In spite of the fact that the referens-design of the motherboard from Intel corporation provides passive cooling of the given chip, engineers Abit used traditional solution for the products — rather small heat sink supplied with the fan. It on a plan of implementators raises stability of operation of the card, especially in modes of the dispersal advocated by Abit corporation in the products.

The second chip of a chip set i875P — ICH5R, responsible for input/output, thanks to insignificant teploobrazovaniju in cooling resources does not require, as has found reflexion in design Abit IC7-G.

In the motherboard architecture, except chips of Intel and Abit, units of such corporations, as Abit, RealTek, Avance Logic (division RealTek), Texas Instruments and others are used.

One more important feature of the architecture and design of motherboard Abit IC7-G is usage of the resources providing implementation of interface Serial ATA 150. In the card 4 channels Serial ATA are provided. Moreover, possibilities RAID are realised. Thus two channels are provided by the built in resources of chip ICH5R, and other two channels Serial ATA — chip Sil3112A.

Support of interface IEEE1394 known as Firewire, is carried out by means of chip Texas Instruments TSB43AB23.

audiosredsta are provided by chip ALC650. The given integrated controller provides a six-channel sound

The special adapter besides, a part of a package provides compatibility of perspective interface Serial ATA with becoming outdated ATA (IDE). This adapter is named by Abit corporation as Serillel. These adapters provide hooking up through appropriate cables to Serial ATA plugs of arrangements ATA extended now. ROM/R/RW CD, similar CDs concern the given arrangements drives DVD, etc., as is known, widespread HDD .

As a part of motherboard Abit IC7-G package adapter Serillel2 created on the basis of chip Image Sil3611 is offered.

In the motherboard architecture the integrated network controller of Intel CSA Gigabit (Intel 82547 Gigabit Ethernet), providing a transfer rate 1 Gbit/with. The given built in network tools allow to include easily the computer through built in RJ-45 plug in structure of a high-speed local area network.

As well as all motherboards of the given corporation, Abit IC7-G supports dispersal modes.

For enthusiasts of dispersal there is a possibility of installation of the forced functional modes of the processor. It is carried out by frequency rise (change of frequency of bus FSB in a band from 100 to 412 MHz with step 1 MHz) processor bus FSB (overclocking) and memory buses, and also a choice of best values of parametres of operation of DDR SDRAM units.

The built in resources of motherboard Abit IC7-G allow to change power of the processor (Vcore) in a band from 1.525 In to 1.9 In with step 0.025 Century

In addition to it there is a possibility of change of level of the power submitted on memory modules (Vmem). The band of change of the given parametre makes from 2.5 In to 2.8 Century

Besides, it is possible to change the power submitted on the videoadapter. A change band — from 1.5 In till 1.65 In with step 0.05 Century

Rise of dependability and stability of operation is promoted by implementation of the hardware monitoring providing the control over supply voltages and operation of cooling fans. This possibility simplifies the control in case of usage of modes of dispersal.

The additional control devices facilitating performance of assemblage and reconfiguration of hardware of the computer are provided also. So, for example, when on the card the power moves, the green light-emitting diode on the motherboard lights up. After start the red light-emitting diode lights up. Check light-emitting diodes are allocated about chip FWH.

Card Abit IC7-G resources realise function Abit FanEQ which allows to regulate speed of rotation of a processor cooler depending on temperature. It provides essential lowering of noise level.

One more feature of Abit IC7-G architecture — usage of a fourline variant of the converter of power (VRM), characteristic for Abit corporation motherboards. Usually VRM it is allocated between the processor and input/output plugs. However apparently on the resulted fragment (a Fig. 8), layout VRM on motherboard Abit IC7-G is nonconventional.

Estimating operation parametres of the described motherboard, it is necessary to mark, that at performance of numerous, durable tests card Abit IC7-G worked steadily, providing high efficiency of the computer, however it is a subject of one of following articles.