Silverthorne, part of Intel’s “Menlow” Mobile Internet Device platform, reportedly runs as fast as a second generation Pentium M processor, but consumes between half a watt and two watts of electrical power–about a tenth of the power consumed by a typical notebook processor. No wonder Apple’s said to be interested in the chip. It would appear to be perfect for a number of devices rumored to be secreted away in its product pipeline–the FlashBook, the multitouch Newton, the Mac tablet.

That said, we’ll likely not see it popping up in a 3G iPhone, though at first glance it would make sense there as well. “According to several iPhone teardowns, Apple is likely using the Samsung S3C6400, or some special equivalent built just for them, in the iPhone,” explains News.com’s Tom Krazit. “That chip is based on the ARM1176 core, which at 620MHz consumes just 279 milliwatts. That’s running all-out, whereas most of the time you’re actually going to be drawing much less power than that. Silverthorne, by contrast, will consume 500 milliwatts of power at minimum, and probably only when it’s doing nothing in idle mode. Those numbers just aren’t going to work in a phone, especially an Apple phone, if the company really is so concerned about power consumption that it has held off on releasing a 3G iPhone until the power consumption of that modem improves.”