This test tells us two really useful data points. The first is how well a particular CPU performs in this heavily multi-threaded test. The second data point you get from this test is how much the design of a laptop suffers from thermal throttling. If you look at the result from the HP Spectre x and compare it to the Dell XPS 13 that has the same CPU, you also see the performance drop-off to aid and abet the cooling capability of the laptop or the decision by the laptop maker not to heat it up too much.
Both use the exact same cooling system, from what I could tell looking inside both. The Broadwell technically loses here, by less than 1 percent. That shows up in 3DMark, where the Broadwell-chipped Dell offers up about 10 percent more graphics performance in Cloudgate.
I even saw a percent difference between the two when the graphics load is scaled back further to 3DMark Ice Storm Extreme. My last benchmark chart for the mobile dual-cores is the most important one for the applications in an ultra-portable laptop. All within the performance envelope of a dual-core processor.
What people care about most is the battery life. The test even lets the laptop go to sleep for a few minutes, when the typical office drone might be checking their phone or chatting to the person in the next airplane seat.
For the record, the RAM chips were different, as were the battery makers, but they used the same specifications. With all things being equal, a percent improvement in battery life is significant when you consider that Haswell was already an outstanding performer.
Access latency after a miss in the L3 cache is 30 - 32ns, nicely in between an L3 and main memory access. Intel doubled the size to deal with any increases in game complexity, and doubled it again just to be sure. Accessing the same data e. I get the impression that the plan might be to keep the eDRAM on a n-1 process going forward. Intel did float an interesting idea by me though. Intel settled on eDRAM because of its high bandwidth and low power characteristics.
The power consumption also sounds very good. At idle, simply refreshing whatever data is stored within, the Crystalwell die will consume between 0. Under load, operating at full bandwidth, the power usage is 3. Crystalwell is only offered alongside quad-core GT3 Haswell. S A The following two tabs change content below. Bio Latest Posts. Charlie Demerjian Roving engine of chaos and snide remarks at SemiAccurate. He is a technologist and analyst specializing in semiconductors, system and network architecture.
As head writer of SemiAccurate. Charlie is also available through Guidepoint and Mosaic. Latest posts by Charlie Demerjian see all.
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