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If you needed a good reason why the latest Intel Skylake processors come with support for either the newer DDR4 memory or the DDR3L memory standard, here is one.
Hardware safety.
There are a few motherboard manufacturers that are supporting even the DDR3 memory modules, but Intel has confirmed that a prolonged use of such DRAM modules will damage the Skylake CPUs — not can, but will.
And that is due to the inherent high voltage that the old DDR3 modules come with by default.
For comparison, a DDR4 memory module defaults at 1.2V, whereas the DDR3L has 1.35V power supply voltage on by default. All these are very low compared to the power munching default of a DDR3 module, which eats 1.5V.
Not to mention that there are some enthusiast DRAM chips that reach even 1.65V supply voltage.
So as reported (http://www.tomshardware.com/news/skylake-memory-support,30185.html), while both the standard DDR3 and the DDR3L (Low Voltage) modules are compatible with the new Skylake processors, using the former in the default 1.5V voltage mode, or the enthusiast variety at 1.6V can fry the Skylake processors in no time.
These damages to the central processing unit are beyond repairs, as you may have figured.
So if you have already bought one, or are building a system has an Intel Skylake chip inside, which is currently the best single-threaded CPU out there, then make sure you reserve some funds for the DDR4 memory modules.
Or at the very least, the DDR3L, which are a smidgeon cheaper than DDR4.
source:windows10update