Intel Core i7 Mobile: Nehalem CPU for notebooks - first benchmarks
The Nehalem architecture gets mobile: Intel launches the Core i7 Mobile. PC Games Hardware summarizes the information about Intel's "Clarksfield” and even got benchmark results.
Since the Nehalem had rolled up the desktop market, Intel now introduces a mobile spinoff. Clarksfield is, to put it bluntly, a Lynnfield in mobile format. Thus the front side bus based architecture (Core 2) is replaced in the notebook market. The memory controlled is located within the CPU Die and not on the motherboard anymore. The new chipset PM55, which is still produced in 65 nanometers, has lost another task. Clarksfield is, like all current Nehalems, a 45 nm processor and uses a dua channel interface in combination with DDR3-1333 RAM. Besides that notebooks now get other Core i7 features, too: SMT and Turbo Mode. The latter one actually is a automatic overclcoking of the CPU if the processor is running on low temperatures or only 1 to 2 cores are utilized.
Intel launches the following three Core i7 CPUs:
|Prozessor||Kerne/Threads||Taktfrequenz||Maximaler Turbo-Takt||L2-Cache||L3-Cache (shared)||TDP|
|Core i7-920XM||4/8||2,00 GHz||3,20 GHz||4 x 256 KiByte||8 MiByte||55 Watt|
|Core i7-820QM||4/8||1,73 GHz||3,06 GHz||4 x 256 KiByte||8 MiByte||45 Watt|
|Core i7-720QM||4/8||1,60 GHz||2,80 GHz||4 x 256 KiByte||6 MiByte||45 Watt|
Core i7 Mobile: First performance results
We took a look at the first pre-production systems from Acer, Asus and MSI. To check the performance we ran Cinebench R10 that converts every available core and thread into better results. The mobile Core i7 CPUs don't only benefit from SMT, but also from the active Turbo Mode. In the Asus M60J the Core i7-820M (1.6 GHz) was feeling so well that it was running with additional 133 MHz constantly although all four cores were stressed to the max. The results are quite high, what is typical for Core i7 processors, since parallel programmed applications benefit a lot from the Nehalem architecture. Intel advertises with 80 to 100 percent increased rendering performance (video editing & Co.) in comparison to equally priced Core 2 quad-cores. But they don't mention that not a single game, except Anno 1404: Dawn of Discovery, benefits from Hyperthreading - quite the contrary is the case: In most cases the feature costs up to 20 percent performance.
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