Thursday, June 2, 2016

LPDDR vs DDR Computer Memory: In Smartphones, Tablets, and Typical Computers

For the past two weeks of browsing for China-made smartphones and tablet computers to be included on my blog, I am wondering how the memory or RAM of these ultra-portable devices to vary from the typical PC's DDR and will be called LPDDR for smaller and low-powered machines. And due to my curiosity about the different terms, I end up writing about the difference of the two necessary part of every computer system.

Let me start with LPDDR, it stands for Low Power Double Data Rate. It is the most common term used in smartphone specifications and tablet computers regardless of capacity. For now, this type of mobile phone memory are ranges from 512MB to a soaring 8GB (available in few Chinese brands). The function of LPDDR has no significant difference with the DDR in typical computers (even in laptops and tower PC) and that is to work and support the operation central processing unit (CPU). However, the power supply of this chip has been reduced to 1.8-volt from the original 2.5-volt. In terms of size, you have to expect a smaller structure for this type of RAM due to the compacted design of smartphones and tablet computers.


Furthermore, manufacturers of LPDDR made a few changes (or we can say, a little sacrifice just for the size) from the original structure of DDR. Its sophisticated packaging has a significant effect on its expected and original performance. We can say that LPDDR has a slower performance and refresh rate compared to the original-sized DDR but that is for being an energy-saving chip.

And in behalf of smaller chip names, LPDDR is also called Mobile DDR (mDDR) or others may also use the term Low Power DDR.

Aside from the above mentioned difference, please forgive me not to move deeper for other related technical terms. But hopefully, that is enough for having a very brief comparison about the LPDDR and DDR (regardless of their generation) terms in smartphones, tablets, as well in personal computers (PCs). And maybe, the most important part aside from knowing how the typical RAM differs from each other, is the memory capacity in terms of gigabytes and refresh rates.

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