Processing technique of silent video

Evgenie Rudometov

Rudometov@rudometov.com

Applying the firm processing techniques providing usage of several heat sinks and thermal handsets, company Gigabyte has released next silent videocard Gigabyte GV-RX16T256V-RH

Modern desktop computers demand video subsystems of the appropriate productivity, the coolings supplied with adequate resources, being sources of acoustic noise. However thanks to application of current technologies variants of cooling systems and without fans are possible. As an example of one of such solutions it is possible to result videocard Gigabyte GV-RX16T256V-RH created on the basis of the video chip (GPU – the geometry processor) ATIRADEON X1600 XT.

Package and key parametres Gigabyte GV-RX16T256V-RH

Fig. 1. Videocard Gigabyte GV-RX16T256V-RH

Into package structure enter: a packing box; videocard GigabyteGV-RX16T256V-RH created on the basis of video chip ATIRADEON X1600 XT, a cable and adapter DVI-to-d-Sub; the documentation in English; CD-ROM with the software.

Key parametres of videocard GigabyteGV-RX16T256V-RH are resulted in Table 1.

Table 1. Key parametres of videocard Gigabyte GV-RX16T256V-RH

Units and subsystems	Parametres
The geometry processor	ATI RADEON X1600 XT
The hooking up interface	PCI Express x16
Size of a video memory, Mb	256
Video memory type	GDDRII 16Mx32
Width the bus of a video memory, bit	128
Video	DirectX 9.0 and OpenGL 2.0, V / S-Vidio and HDTV output
Plugs	DVI-I, TV-Out, VGA Monitor (15 pin)

 

Features of construction Gigabyte GV-RX16T256V-RH

Widespread resources of cooling of the high-powered video chips, consisting of the heat sink and the fan, generate considerable acoustic noise. The given noise is the negative factor. With it implementators of all computer components, forced to use traditional coolers try to struggle.

However there are also the alternative variants which are not providing usages of fans. For example, maintenance of a temperature mode necessary for correct operation GPU can be reached by means of the several compact heat sinks jointed by special heat-conducting handsets. Such handsets have received the name thermal (Heat Pipe).

The given resources are rather new products. For the first time the idea of application of thermal pipes as arrangements with a high thermal conduction has been offered in 1942. However only the last years they began to use intensively in coolers of monolithic microcircuits. And as it has appeared, on efficiency thermal handsets essentially, many times over, exceed possibilities of continuous copper cores of equal diameter with them.

The principle of operation of thermal handsets is grounded on thermophysics of transformation of the liquids concluded in hollow handsets, vehicles of transmission of thermal energy playing a role.

Fig. 2. A principle of operation of a thermal handset

Specially picked up liquid under the influence of heat derivated, for example, from operation graphics or central processor units passes in a gaseous state (a Fig. 2). Thus at the expense of transformation heat considerable quantity is swallowed very much, for example, warmth of steam formation for water makes 539 calories on each gramme.

In a vaporous state the liquid reaches the cold end of the thermal handset jointed to the heat sink, disseminating heat. At the expense of cooling the liquid in a thermal handset is condensed, giving heat to a handset, and from it and to the heat sink. At this stage warmth of steam formation comes back back through the heat sink in environing air environment.

It is necessary to mark, that the internal surface of the hollow metal handset playing a role thermal, is coated by special capillary-porous substance. skondensirovavshajasja the liquid at the expense of forces of surface-tension through the given porous substance gets again to hot area.

At this stage the cycle is ended to repeat again and again. It also ensures functioning of the thermal pump which role is fulfilled by the described thermal handset handling thermal energy from the protected semiconducting unit to the heat sink.

It is necessary to mark, that such handset is capable to handle thermal energy in considerable quantities and with a high speed. It is necessary to pick up correctly only a liquid or mixture of liquids that steam formation occurred in a demanded band of temperatures taking into account pressure in the shorted space of a handset. Usually the temperature range which is required for correct operation of semiconducting units and is installed for thermal handsets, makes from 20 to 100 °s.

For cooling of processors, both GPU, and CPU, as a working liquid water (a band of an operating temperature from 30 to 200 °s) or acetone (a band of an operating temperature from 0 to 120 °s) can use. As a substance of a thermal handset, as a rule, use copper, but the steel can be applied and aluminium, and even. As to the capillary-porous substance applied in thermal handsets it should be enough melkoporistym for improvement of capillary effect. However designers should consider, that too melkoporistaja the structure can interfere with liquid penetration. It is necessary to mark, that the choice of the given substance depends both on a liquid, and from an operating temperature, and from total length of a thermal handset.

Usage of thermal handsets allows to create constructions from the several heat sinks jointed together. Such construction is arranged optimally on a surface of a videocard for the purpose of effective dispersion of heat taking into account existing air streams.

Such construction has been taken as a principle systems of cooling GPU ATIRADEON X1600 XT of videocard GigabyteGV-RX16T256V-RH. A method of cooling by means of the given construction consisting of several heat sinks and thermal handsets, it has been named by experts Gigabyte processing technique Silent-Pipe II. The specified construction of system of cooling GPU uses two outlines of thermal handsets. One of them takes away heat from heat sink GPU to allocated on an opposite side of a videocard to the cooling heat sink. The second outline takes away heat from heat sink GPU to the third heat sink allocated for ports.

Thermal handsets of a videocard it is resulted in a Fig. 3.

Fig. 3. Thermal handsets of videocard Gigabyte GV-RX16T256V-RH

The turned out video subsystem is completely silent, that raises its attractiveness among potential users.

The specified construction of cooling GPU well functions in an open system unit. However its efficiency essentially raises in case of usage of streams of air, obrazuemyh at the expense of existing case fans. In case of presence of such fans sucked in cold air cools videocard heat sinks, transiting at first through slices of the heat sink allocated for ports, and further — through heat sink slices on GPU. The small part of a stream cools also the heat sink of a videocard allocated on its underside. Thermal handsets carry out thermal link between the given heat sinks, providing alignment of temperatures.

One more stream of air forms thanks to rotation krylchatki the fan of the central processor unit allocated in immediate proximity from a videocard. This stream together with the main streams generated by case fans, cools the heat sink of a videocard allocated on its underside even more, and thanks to a thermal handset and the heat sink on frontal to the side and through it — is direct also chip GPU.

It is necessary to mark, that efficiency Silent-Pipe II, in system unit correctly designed and supplied with case fans it is high enough. Operational testing of a described videocard testifies to it. As to productivity of the specified videocard it has been estimated in the course of intensive testing.

Productivity

The numerical data resulted in Table 3 testify to productivity of videocard Gigabyte GV-RX16T256V-RH – Table 4 and in a Fig. 4 – a Fig. 5.

Table 3. Results of performance of the test 3DMark05 for different videocards

Videocard	Results
Nvidia GeForce 5900	989
Ati Radeon X600	2278
Gigabyte GV-RX16T256V-RH	5372

Fig. 4. Results of performance of the test 3DMark05

Table 4. Results of performance of test PCMark04 Graphics for different videocards

Videocard	Results
Ati Radeon X600	3545
Nvidia GeForce 5900	4225
Gigabyte GV-RX16T256V-RH	5605

Fig. 5. Results of performance of test PCMark04 Graphics

The cited data do not require remarks and testify to high efficiency of videocard GigabyteGV-RX16T256V-RH.

In summary it is possible to recommend the given map to a wide range of the users aspiring to silent, rather high-powered systems.

Videocard GigabyteGv-Rx16T256V-Rhbyla is given by the Moscow office of company Gigabyte