找了很久也没有找到如何进入苹果电脑BIOS的方法，今天偶然发现了一个方法，还没有实际试用。
1 Shut down your MacBook by pressing the Power On/Off button once and choosing “Shutdown.”
2 Power on your MacBook after it has completely turned off.
3 Press the following keys simultaneously “Command,” “Option” and the letters “O” and “F” before the system starts up.
4 Press the keys until a prompt screen opens up. You have accessed MacBook’s BIOS equivalent.
These graphics cards for notebooks are not suitable for games. If they run, they may run with graphical errors and very low frame rates. Office and internet tasks are, to the contrary, no problem for these GPUs.
Only some older games can be played fluently with these graphics chips. Shared memory graphic cores in this category got the advantage of less heat production and longer battery runtimes. For office, internet, image processing, and (SD) video editing tasks these graphics chips are still useable without any restrictions.
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Some modern games can be played with these graphics cards but only non demanding ones. Still, these cards provide enough performance for office tasks or video viewing (inconclusively for HD videos). The integrated cards offer usually the best battery runtime.
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Low-end graphics cards for users who want to play games. New games should run on these cards, but only with low details and mediocre resolution. The power consumption (of modern cards in this class) should lead to a good battery life.
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These cards should be able to handle all current games with fluent framerates but not all with high detail settings. Especially demanding games may only run in low-medium detail settings. However, you can get some cards in smaller form factor laptops with good battery life.
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These cards offer the best 3D performance in a laptop. They can handle all the latest games at high resolutions and high detail settings. The power consumption of these GPUs is very high, therefore, only big laptops with bad battery life usually offer these cards.
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In this report we present all laptop processor series which are available at the market at present and give a rough classification of the current consumption and the performance of the different architectures.
An approximate ordering with average benchmark values can be found in our benchmark list of mobile processors.
Successor of the Clarksfield quad-core and arrandale dual-core processors. They are still called Core i3/i5/i7 and the model number is now preceded by a “2″ for 2nd generation. Therefore the models are called Core ix-2xxx.
Sandy Bridge is the evolutionary successor of the Arrandale architecture. The most notable improvements are the new 256 Bit AVX instructions, the improved Turbo Boost 2.0 (automatic overclocking) and the integration of the graphics card into the 32nm CPU core.
Informations and performance charts on the Sandy Bridge Quad Core processors can be found in this article.
Example models: Core i7-2630QM, i5-2410M, i3-2310M
You can learn the fineness of the resolution in relation to the display size from the values of the following table.
The values are indicated in DPI (= dots per inch).
