The 720QM can drop even lower, down to just 933MHz. The 920XM and 820QM are capable of throttling back their clock speeds via SpeedStep to 1.2GHz in what Intel calls Lowest Frequency Mode (LFM).
The chip can also opportunistically cut power to its cache, memory controller, and I/O components, too. Those TDPs are much lower than Lynnfield’s 95W rating, of course, but they’re still high enough to keep Clarksfield out of smaller notebook designs.Ĭlarksfield employs numerous tricks to save power, including shutting down individual cores when they’re not in use. The 920XM has a Thermal Design Power (TDP) rating of 55W, while the other two are rated for 45W. Clarksfield certainly presents a challenge on that front. I suspect success will largely depend on the effectiveness of the notebook’s cooling system. Intel doesn’t guarantee that every CPU will hit its Turbo Boost peak, however. The 920XM and 720QM can each boost their clock speeds by 1.2GHz, or around 60%.
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Yet that pales in comparison to the Core i7-820M, which can push its core a full 1.33 GHz higher for a whopping 77% increase in clock speed. The most aggressive Lynnfield-based desktop CPU can raise its clock speed by 667MHz above its baseline, which translates to a healthy 18% increase. Interestingly, the mobile Core i7s have much more Turbo Boost range than their desktop counterparts. Turbo Boost is most aggressive when only one or two cores are occupied, but it’ll also push the issue a little if all cores are engaged, thermals permitting. Thanks to Turbo Boost, Clarksfield CPUs can dynamically range above their base clock speeds when adequate thermal headroom is available. Of course, these base values are just the tip of the iceberg. The range-topping 920XM has a base clock speed of 2GHz-a good 666MHz shy of its slowest Lynnfield-based desktop counterpart. Obviously, the thermal challenges inherent to mobile applications put a bit of a damper on Clarksfield clock speeds. The 920XM and 820QM both have 8MB of 元 cache, but the 720QM must make do with only 6MB. That’s backed by 256KB of L2 cache per core, with a shared 元 cache serving as a last line of defense before main memory. Each of Clarksfield’s cores has 32KB L1 data and instruction caches.
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