These researchers are skipping the waterblock altogether and have made channels in surface of the die its self for de-ionized water to flow through and cool the chip. The 28-nanometer Altera FPGA they tested this cooling method on had numerous channels cut into it which were then sealed up with a layer of silicon. With a flow rate of 147 ml/minute they kept the chip to a comfortable 24C, a mere 4C higher than the temperature of the water and significantly lower than the 60C the chip would run at using air cooling. Neither Hack a Day nor PCPer encourage you to try to cut micron sized channels in your brand new processor, however we all hope to see this cooling technique incorporated into heatspreaders in future generations of processors.
"Researchers at Georgia Tech have been working on cutting fluid channels directly into the back of commercial silicon die (an Altera FPGA, to be exact). The tiny channels measure about 100 micron and are resealed with another layer of silicon. Water is pumped into the channels to cool the device efficiently."
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