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PC2-5300 DDR2 SO-DIMM (for notebooks) Comparison of memory modules for desktop PCs (DIMM) Comparison of memory modules for portable/mobile PCs (SO-DIMM) The key difference between DDR2 and DDR SDRAM is the increase in prefetch length. In DDR SDRAM, the prefetch length was two bits for every bit in a word; whereas it is four bits in DDR2 SDRAM.
JEDEC has set standards for the data rates of DDR SDRAM, divided into two parts. The first specification is for memory chips, and the second is for memory modules. The first retail PC motherboard using DDR SDRAM was released in August 2000. [10]
Compared to DDR2 memory, DDR3 memory uses less power. Some manufacturers further propose using "dual-gate" transistors to reduce leakage of current. [10]According to JEDEC, [11]: 111 1.575 volts should be considered the absolute maximum when memory stability is the foremost consideration, such as in servers or other mission-critical devices.
A 64 bit memory chip die, the SP95 Phase 2 buffer memory produced at IBM mid-1960s, versus memory core iron rings 8GB DDR3 RAM stick with a white heatsink Random-access memory ( RAM ; / r æ m / ) is a form of electronic computer memory that can be read and changed in any order, typically used to store working data and machine code .
In 2013 Asus restarted the Eee PC series [24] with the 1015E models, some of which are on Windows 8 and some on Ubuntu Linux. These come with 2 GB memory and USB3 ports. The 1015E fixes some of the problems with the 1025C by using a faster processor, 2GB memory and stereo speakers. The RAM is soldered in place and cannot be upgraded.
Notably, the P series sports non-upgradeable [4] RAM that is soldered to the motherboard, with some models including just 1GB of RAM. [5] It uses a pointing stick in the keyboard as its pointing device. Exact specs vary by region. An integrated "Motion Eye" webcam (optional in some models) is located on the upper right corner of the display bezel.