The temperature of the i7-4650 CPU levels off at around 95 ☌ (203 ☏) in this case.Īnd now, the final question: What should you buy? i5 or i7 processor, 128 GB or 256 GB SSD? The GPU starts with 900 up to 950 MHz, which is just slightly lowered to values between 800 and 900 MHz. The CPU works with 2 GHz after the start but this is quickly lowered to 800 MHz and rarely reaches values between 10 MHz over the period of the benchmark. The clocks and core temperatures during the Unigine-Heaven benchmark are also very similar to the i5 version. A run of 3DMark 2006 immediately after the stress test was identical to a cold start, a thermally caused throttling is therefore rather unlikely in more realistic scenarios. The temperature is around 90 ☌ (194 ☏) in this case.Īll in all this behavior is very similar to the reviewed i5 configuration of the MacBook Air 11, the main difference is the higher nominal clock of the i7 CPU. Full CPU load is handled much better, a continuous load by Prime95 results in steady 2.3 GHz, the nominal clock of the CPU. The clock levels off at 450 MHz while the CPU runs with 800 MHz with core temperatures of around 80 ☌ (176 ☏). The situation does not really change if we only use FurMark to stress the GPU. Typical for Apple is the slow rise to the maximum fan speed of 6500 rpm, the result is a core temperature (HWInfo) of 80 to 90 ☌ (176 to 194 ☏). This drop below the nominal clock is definitely a case of throttling, at least in this extreme scenario. Consequently, the GPU clock is also reduced to 450 MHz, sometimes it is even reduced to 200 MHz. We also ran Prime95 and observed that the core temperature reaches the critical area above 95 ☌ (203 ☏) within seconds. Just after the start of FurMark the CPU clock was reduced to 800 MHz. Unfortunately, our review unit gave up fairly quickly.
#256 MACBOOK SD CARD MAC OS#
This could indicate a better thermal management of Mac OS that enables higher GPU turbo clocks for a longer period.Īs usual, we also tortured the MacBook Air 11 with our stress test, a combined CPU and GPU load for more than one hour. 20.58) under Windows, we determined a 15% lead with Mac OS. Interesting: While the Cinebench R11.5 OpenGL benchmark shows no significant advantages for the i7 CPU (19.63 vs. However, we cannot determine a worse thermal behavior of the i7 CPU because of this. Typical clocks in the benchmarks were between 750 and 900 MHz.Ĭompared to the similar MacBook Air Mid 2013 with the i5-4250U CPU the clocks are consequently higher but the chip reaches critical temperatures quicker, which leads to a reduced turbo clock. We were able to squeeze up to 950 MHz out of the GPU in the Unigine-Heaven benchmark, but the clock was often reduced because the temperatures were very high between 95 ☌ (203 ☏) and 99 ☌ (210.2 ☏). The consequence is a lower clock between 650 and 750 MHz. The turbo clock of the integrated HD 5000 graphics is raised up to 850 MHz in the Cinebench R11.5 OpenGL-Shading test but the chip reaches a core temperature of 99 ☌ (210.2 ☏) (HWInfo) after a few seconds. The chip reduces its clock to 800 MHz during idle. The MacBook Air reaches 2.7 up to 2.9 GHz at the beginning of the multithread benchmark, but once again the clock fluctuates between 2.3 and 2.9 GHz after a couple of seconds. At least at the start we determined 3.3 GHz for fractions of a second before it leveled off at 2.9 GHz after a few seconds. During our benchmarks the clock fluctuated between 2.7 and 2.9 GHz the promised 3.3 GHz were only utilized in the SuperPi benchmark. As mentioned before the maximum turbo clock of the Intel Core i7-4650U CPU is 3.3 GHz, which is also advertised by Apple.
#256 MACBOOK SD CARD WINDOWS#
The i7-4650U processor shows a similar behavior: The maximum clock was 2.9 GHz for the single thread benchmark of Cinebench R11.5 and Windows operating system (via Bootcamp). Even the i5 CPU had some problems with the turbo clocks the maximum clock of the CPU was rarely used.
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