April 2009
Vol. 1 Issue 3
 
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  In This Issue
STALKER Contest
ATI and PowerColor Launch new Radeon HD4890
Liquid cooling on a graphics card?
Product Spotlight
STALKER Contest
Thanks to everyone who participated in the STALKER Quiz contest last month. Congratulations to all the winners.

Just to let everyone know, the bundle pack is still available through NewEgg. Quantities are limited so get them while they’re still available!
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ATI and PowerColor Launch new Radeon HD4890
Last week we announced the official release of the Radeon HD4890 graphics card. Read the press release here. This is the latest in the line of the award-winning 4800 series video cards debuted late last year. With the HD4890, we’re excited to provide such a powerful and technologically sound card for the enthusiast gamer.

In addition, PowerColor is making available our customized Liquid Cooling Solution (LCS) for the HD4890 ( press release ) . PowerColor’s LCS HD4890 has a full water block mounted onto the card, fully covering the memory and power regulator chip. With a copper based design, it is able to reduce temperatures up to 20°C compared with the reference version.
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Liquid cooling on a graphics card?
Graphic cards typically have two cooling methods: air cooling and liquid cooling. The drawback of air cooling is that the flow rate is restricted due to the air’s ability to conduct heat called thermal conductivity. This reduces the efficiency of heat dissipation and as a result, GPU fans become overloaded creating loud noise.

Liquid Cooling, on the other hand, has a better thermal conductivity than air. It can completely dispel excessive heat within an airtight environment. Hardcore gamers prefer liquid cooling systems because it is able to dissipate a greater amount of heat in a quiet setting.

A full set of Water cooling system includes:
Water Block Tubing Water Pump Radiator

Excessive heat from PCB Component (thermal energy) is transmitted via a Water Block to the cooling medium (water). Carrying the excessive heat, the water will then pass through tubing to a radiator, where the liquid cools. A water pump circulates the cooled water back to the water block and the process repeats to achieve a silent cooling system.

Technically, a water cooling system is not absolutely silent. Water needs to pass through the tube to a radiator, which requires a fan to increase heat removal. However, the fan and engine that make the set of radiator are very small; the noise level will be barely noticeable. If the radiator did not have a fan, the heat sink would be very large to compensate for the fan’s role in accelerating cooling.
Two determinants for a water cooling system’s efficacy are the heat conducting ability between heat source and radiator and the heat transferring ability between radiator and fluid.

With its superior cooling performance and low noise level, water cooling solution rises above all other cooling methods for a GPU system.
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Product Spotlight
PowerColor HD4890 PowerColor HD4870 Stalker edition

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