DIMM Temperatures

Besides the CPU, we also wanted to know how the other components coped with the higher temperatures. First are the Samsung RDIMMs.

DIMMs can operate at up to 95°C, so all the measurements seem to be quite safe.

PCH Temperatures

How about the chipset?

 

The 8W Intel C602J is specified to work at up to 92 °C, so again there is still a lot of headroom left, even with 40°C inlet air temperature. Notice that the CPU used still has an impact on the temperature of the PCH, despite the fact that there is quite a bit of space between the PCH and the CPU heatsinks. The higher performance offered results in the chipset having to work harder as well.

Power Results Conclusion
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  • lwatcdr - Thursday, February 20, 2014 - link

    Here in south florida it would probably be cheaper. The water table is very high and many wells are only 35 feet deep. Reply
  • rrinker - Tuesday, February 11, 2014 - link

    It's been done already. I know I've seen it in an article on new data centers in one industry publication or another.
    A museum near me recently drilled dozens of wells under their parking lot for geothermal cooling of the building. Being large with lots of glass area, it got unbearably hot during the summer months. Now, while it isn't as cool as you might set your home air conditioning, it is quite comfortable even on the hottest days, and the only energy is for the water pumps and fans. Plus it's better for the exhibits, reducing the yearly variation in temperature and humidity. Definitely a feasible approach for a data center.
    Reply
  • noeldillabough - Tuesday, February 11, 2014 - link

    I was actually talking about this today; the big cost for our data centers is Air Conditioning; what if we had a building up north (arctic) where the ground is alway frozen even in summer? Geothermal cooling for free, by pumping water through your "radiator".

    Not sure about the environmental impact this would do, but the emptiness that is the arctic might like a few data centers!
    Reply
  • superflex - Wednesday, February 12, 2014 - link

    The enviroweenies would scream about you defrosting the permafrost.
    Some slug or bacteria might become endangered.
    Reply
  • evonitzer - Sunday, February 23, 2014 - link

    Unfortunately, the cold areas are also devoid of people and therefore internet connections. You'll have to figure the cost of running fiber to your remote location, as well as how your distance might affect latency. If you go into permafrost area, there are additional complications as constructing on permafrost is a challenge. A datacenter high in the Mountains but close to population centers would seem a good compromise. Reply
  • fluxtatic - Wednesday, February 12, 2014 - link

    I proposed this at work, but management stopped listening somewhere between me saying we'd need to put a trench through the warehouse floor to outside the building, and that I'd need a large, deep hole dug right next to building, where I would bury several hundred feet of copper pipe.

    I also considered using the river that's 20' from the office, but I'm not sure the city would like me pumping warm water into their river.
    Reply
  • Varno - Tuesday, February 11, 2014 - link

    You seem to be reporting on the junction temperature which is reported by most measurement programs rather than the cast temperature that is impossible to measure directly without interfering with the results. How have you accounted for this in your testing? Reply
  • JohanAnandtech - Tuesday, February 11, 2014 - link

    Do you mean case temperature? We did measure the outlet temperature, but it was significantly lower than Junction temperature. For the Xeon 2697 v2, it was 39-40 °C at 35°C inlet, 45°C at 40°C inlet. Reply
  • Kristian Vättö - Tuesday, February 11, 2014 - link

    Google's usage of raw seawater for cooling of their data center in Hamina, Finland is pretty cool IMO. Given that the specific heat capacity of water is much higher than air's, it more efficient for cooling, especially in our climate where seawater is always relatively cold. Reply
  • JohanAnandtech - Tuesday, February 11, 2014 - link

    I admit, I somewhat ignored the Scandinavian datacenters as "free cooling" is a bit obvious there. :-)

    I thought some readers would be surprised to find out that even in Sunny California free cooling is available most of the year.
    Reply

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