Performance or Power: Which Will Nehalem Use? - Page 2

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No good watt goes unused

Intel is off to a good start with a 3.2GHz Core i7. The top of the line for desktop quad cores is the QX9775, and it maxes out at 3.2GHz as well, which means Intel could come out with a faster i7 thanks to its Turbo Boost technology.

Turbo Boost turns off cores that are not in use with a new technology, called power gate, that turns off all power to the core. That's not just putting them in idle or standby mode, that's shutting them off completely. Power can then be routed to the core or cores in use to give them a minor power bump if they are being particularly taxed.

That bump might be about five percent or less, depending on the speed of the processor. The 2.66Ghz Core i7 would get a bigger bump than the 3.2GHz i7 would, since the 2.66Ghz chip is running slower to begin with.

What remains to be seen is the impact this will have on servers. Nehalem servers will have a new CPU, one less power-drawing chip on the motherboard and memory that draws a lot less power. That could mean lower-power, cooler servers in the future, something that would be welcomed in datacenters, where power and cooling is a major concern.

"This is disruptive technology in a good way," said Rob Crooke, general manager of the Business Client Group at Intel during a question and answer session at the launch event. "Our goal was to require the same amount of power to get higher performance. The thermal designed footprint for this is held constant or reduced so you can get more computing out of the same footprint or less."

Peddie doesn't think it will change much, however. "I think the simplest model is [datacenters] will use their air conditioners less than they used to, which will save them some power, and their power bill will be less than it used to be," he told InternetNews.com. "I see it as a benefit and a bonus but I don't see them doing anything dramatic with it."

However, Brookwood thinks power savings will just be used up elsewhere. "People will take more power if they can get it. They are taking advantage of whatever power savings they had by not having to drive that humongous front side bus to run the chips at a higher temperature or a higher speed," he said.

Intel plans to discuss its Nehalem server plans next month.