Complexity and productivity of the computer units making a basis of modern computers, steadily raises according to Moore's known law. According to this law complexity of semiconducting units increases twice each 18 months. This law formulated for the first time for processors with surprising accuracy describes development practically all computer units. As a result the number of transistors in processors has practically reached 100 million and there are underplates to consider, that the next years it is number will exceed 1 billion

However this complicating of the internal architecture and productivity concerns not only processors, but also other accessories. As a result of high rates of development computer power for the period which has transited since time of release of the first personal computer, has raised in thousand and even in ten thousand times.

Vary not only separate units, the computer architecture varies, processing techniques of data processing vary even. Modern accessories, obedinennye in the specialised subsystems making a basis of the architecture of the computer, step-by-step turn to separate computers with the processors, local memory, buses, BIOS etc. The given tendency can be observed and on the basis of a hard disk, and the optical drive, sound and network maps, the modem and, of course, the videoadapter. This extremely important unit of the modern multimedia computer has step-by-step turned to extremely powerful specialised data-processing centre.

Modern videoadapters are high-powered computing systems with own BIOS, memory, buses and the processors which role fulfils modern video chip sets with functions 2D/3D [1]. Growth of productivity of videoadapters demands depositing of respective alterations in the architecture of computers, for example such, as hardware-software support of modes AGP 2X/4X. These modes are provided with modern chip sets and motherboards [2], without which support not probably development of the architecture of computers and implementation of potential possibilities of modern videoadapters.

Productivity of the AGP-videoadapters calculated for modes AGP 4X, — is very great. However there were messages on development of specification AGP 8X. That day when release of appropriate video chip sets and arrangements on their basis will start is near. And it when possibilities AGP 2X are not settled yet to the full. Such situation means, that simultaneously with maintenance of videoadapters with AGP 2X in the market there are all new and new arrangements with AGP 4X, and the industry step-by-step steals up to boundary AGP 8X. All it calls impetuous growth of the listed products, released by different manufacturers and possessing different productivity, and different consumer properties.

The abundance of videoadapters does not promote simplification of procedure of a choice for the potential user. How to understand with this task? Possibly, again to return to testing and ratings. Apparently, this path is inevitable and it is necessary to access to it again and again. And to earlier received estimations it is necessary to add new data.

Appearance of rather recently developed high-powered video chip sets for videoadapters, such as Nvidia Riva TNT2, Matrox G400, etc . Has brought respective alterations in ratings, as it is displayed on the schedules presented more low received as a result of data processing, presented by known Mercury Research corporation.

Video accelerators and memory sizes

The examples of the videoadapters using resulted video accelerators.

The videoadapters created on the basis of chip set Nvidia Riva TNT2:

· ASUS AGP-V3800 TNT (32/16 Mb SGRAM).

· ASUS AGP-V3800 TNT-TV AGP (32/16 Mb SGRAM, TV-in/out).

· Diamond Viper V770 (32 Mb SGRAM).

The videoadapters created on the basis of chip set Nvidia Riva TNT2 Ultra:

· ASUS AGP-V3800 TNT Ultra (32 Mb SGRAM).

· ASUS AGP-V3800 TNT-TV AGP (32/16 Mb SGRAM, TV-in/out).

· Diamond Viper V770 Ultra (32 Mb SGRAM).

The videoadapters created on the basis of chip set ATI Rage 128:

· ATI Xpert 128 (16 Mb SDRAM).

· ATI Rage Fury (32 Mb SDRAM, TV-out).

· ATI Rage Magnum (32 Mb SDRAM).

The videoadapters created on the basis of chip set Matrox G200:

· Matrox Mistique G200 (8/16 Mb SDRAM).

· Matrox Millennium G200 (8/16 Mb SGRAM).

The videoadapters created on the basis of chip set Matrox G400:

· Matrox Millennium G400 (16/32 Mb SGRAM).

It is necessary to mark, that process of testing and ranking of released accessories has continuous character. Also it is linked first of all to successes of electronic industry. As a rule, enthusiasts and ordinary users to the full will not be in time to take pleasure in possibilities of the gained arrangements as the new are already released. And to that an example of a map on the basis of video chip set GF256 incorporating a special graphics coprocessor. The modern architecture of this video accelerator constructed with application of leading-edge technology, provides usage of fast memory of type SDRAM, SGRAM. It is necessary to mark, that for reaching still bolshej productivity videoadapters are quite often completed with the newest video memory DDR SDRAM possessing the big high-speed performance in comparison with memory SDRAM and SGRAM. Here it is necessary to remind, that processing technique DDR used in memory DDR SDRAM, provides transmission and data processing of data as on front, and back to fronts of clock pulses.

The comparative estimation of maps on GF256 and TNT2 Ultra with usage of memory SDRAM and DDR SDRAM is more low resulted.

Thanks to features of the architecture and presence of a graphics coprocessor video chip set GeForce256 shows considerable increase of productivity. In the programs specially oriented to usage of the coprocessor, this gain can be several times more than on the resulted schedules. These schedules visually show growth of productivity of computers at usage of more powerful, more perfect units.

However, despite the presented estimations, it is necessary to mark, that the cited data at all do not mean, that in modern computers the productivity gain can be provided exclusively at the expense of the videoadapter and any more regular changeover of the processor by more powerful is not required. Such it would seem obvious output mismatches the validity. The matter is that the most complete implementation of potential possibilities of modern videoadapters substantially depends on power of the central processor unit. It visually shows the following schedule.

Usage of more powerful processor provides the big productivity of a video subsystem, and accordingly and all computer.

Development of videoadapters is carried out by fast rates. And despite perfection of modern units that day when leaders of the modern computer market will give way to more perfect, more efficient arrangements which will even more expand possibilities of products of multimedia is near.

Computer race proceeds.

The literature

1. Rudometov E, Rudometov V.Arhitektura of the PC, accessories, multimedia. — SPb: Peter, 2000.
2. Rudometov E, Rudometov and chip sets — SPb: Peter, 2000.