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InformationX-bit Labs for mobile users! Do not forget that we are running a special version of X-bit Labs web-site for users of mobile and handheld devices: http://pda.xbitlabs.com. Check out our news and articles from smartphones and PDAs to be always updated on the latest computer and technology news. <%BANNER[right_130x600]%>
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Articles: Coolers
Water-Cooling Systems Roundup: 16 Systems Reviewed! (page 2)Category: Coolers [ 03/30/2006 | 08:48 AM ] Testbed and MethodsA special testbed is used to check the performance level of a PC cooling system. Most often it is just a regular top-end computer. Such a testbed yields rather stable and repeatable measurements. Yet another advantage is that real-life components with their real-life dimensions and heat dissipation are in use instead of some simulations. Such testbeds do have drawbacks, though:
Considering all these factors, we decided to develop an all-purpose specialized testbed for testing air- as well as water-based cooling solutions for the PC, but we met some problems in our early experiments with CPU emulators. At first we built a testbed with a power transformer and a wire-wound resistor in a metal casing. The resistor proved to be the weak link as it burned down due to high density of the generated heat energy, but we couldn’t use a more powerful resistor since it would have been much bigger than a normal processor. We didn’t try to make a heater element on nichrome or Peltier elements due to certain problems with such devices and their operation. The fundamental solution was to use a high-power semiconductor device as a heater. We didn’t come to this solution by chance, but based our choice on the CPU analogy. The CPU die and the die of a high-power transistor have the same basic manufacturing technology. The high-power transistor, like the CPU, can have a high heat dissipation density at small dimensions and weight. The first and cheap emulator of CPU heat dissipation was made by us out of a bipolar transistor from Toshiba, part number 2SC-5200. It is meant for low-frequency equipment like power amplifiers, output and driver stages of high-power drives. We’ve learned the parameters of the transistor well enough, and our long tests in linear mode proved its reliability at peaks of critical power dissipation. The transistor is not the only option here. Various chips, amplifiers or transistor packs, special semiconductors capable of linear operation at high power loads can be employed. When choosing the semiconductor for our operating mode, the main factors are small dimensions, high operating power and power dissipation, and easy implementation of control. The first version of the stand was JudgeMARK-300. The testbed is based on a mainboard PCB, which necessary components such as the power section and the measuring instruments were all laid out on. The tested sample was installed right on the case of a 2SC 5200 transistor which played the role of a heater. The sensor was put right into the transistor’s case. <%BANNER[banner_468x30]%>
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Category NewsCategory: Coolers Thursday, June 26, 20085:20 pm Coolink Unveils Thermal Compound with Ceramic Nano-Particles. Thermal Grease with Ceramic Nano Particles Approaches the Market Friday, June 6, 200811:10 am IBM Touts New Liquid-Cooling Technique. IBM to Use Liquid to Cool 3D Chips Tuesday, March 11, 20084:05 pm OCZ Technology Launches Vendetta 2 CPU Cooler. Vendetta Grew Up Wednesday, August 15, 20072:13 pm New Chip-Cooling Technology Promises a Revolution. Ionic Winds for Locally Enhanced Cooling Thursday, May 10, 20073:35 pm OCZ Vindicator: Scythe Ninja Clone or New Proprietary Design? OCZ and Scythe Officials Argue All Latest News <%BANNER[right_130x130_1]%>
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