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AMD Phenom 125W chips kill cheap 780G motherboards

Posted on Monday, April 07 2008 @ 20:36:21 CEST by

AnandTech reports many budget motherboards based on the AMD 780G chipset aren't capable of running the new AMD Phenom 9850BE and 9900 processors because these chips draw too much power. The problem also occurs with the older 6400+ X2 chip, AnandTech says dropping a 125W CPU in one of these cheap 780G motherboards is asking for trouble and will result in a very quick death for your motherboard.
We discovered quickly that running the 9900/9850BE or 6400+ X2 on these products resulted in the loss of the board, in a matter of a few seconds to a few minutes. Granted, it will probably be rare that a user will purchase a 9850BE to run on this platform, but in case you were considering that course of action, we highly suggest you do not. Let’s get this out of the way quickly; it is not a 780G chipset problem. In fact, it is not strictly a board problem either, but rather a design issue.

This design issue can just as easily occur on NVIDIA or Intel chipset boards, so while we are talking about the 780G product line, just be aware that it can happen on any board with any chipset. In fact, our last GeForce 8200 has already experienced a painful demise. The design issue comes down to the manufacturer trying to balance performance requirements and costs when providing a product in this market sector. The budget sector is very price sensitive, and for the most part users will typically use a lower-end processor.

The vast majority of the 780G boards have a three-phase or four-phase PWM circuitry design. These designs are completely acceptable for the 45W, 65W, 89W, and 95W TDP rated processors; however, drop in a 125W TDP processor such as the Phenom 9850e or 6400+ X2 and you are asking for trouble. Trouble is exactly we found, as each board we tested eventually succumbed to the greater power requirements of these processors.
More info over here.



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