|17 Nov 2013||#1|
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DDR4 Next-gen memory. Next-gen performance.
The next generation of DD4 RAM is coming soon.
Coming late 2013.
Designed to enable the next generation of enterprise and consumer products, Crucial® DDR4 memory technology represents the future of computing. Moving beyond the outgrown limitations of DDR3 module architecture, Crucial DDR4 memory is engineered to pack more performance into your system and has the capability to double the available density per module. Crucial DDR4 modules will use up to 20% less voltage than previous technology, and will enable mainstream data rates that are at least twice as fast as DDR3 memory. With DDR4 memory in your system, get ready to process data twice as fast, load applications faster, experience quick snap responsiveness and increased ability to multitask. If you thought the tablets, ultrabooks, and desktops of today already seem fast — get ready to be blown away. The technology that enables electronics is about to get better and faster than ever before.
Crucial.com - Crucial DDR4 coming soon!
DDR4 SDRAM - Micron Technology, Inc.
DDR4 SDRAM - Wikipedia, the free encyclopedia
|My System Specs|
|17 Nov 2013||#7|
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The principle differences are:
•DDR3 runs at a higher voltage that GDDR5 (typically 1.25-1.65V versus ~1V)
•DDR3 uses a 64-bit memory controller per channel ( so, 128-bit bus for dual channel, 256-bit for quad channel), whereas GDDR5 is paired with controllers of a nominal 32-bit (16 bit each for input and output), but whereas the CPU's memory contoller is 64-bit per channel, a GPU can utilise any number of 32-bit I/O's (at the cost of die size) depending upon application ( 2 for 64-bit bus, 4 for 128-bit, 6 for 192-bit, 8 for 256-bit, 12 for 384-bit etc...). The GDDR5 setup also allows for doubling or asymetric memory configurations. Normally (using this generation of cards as example) GDDR5 memory uses 2Gbit memory chips for each 32-bit I/O (I.e for a 256-bit bus/2GB card: 8 x 32-bit I/O each connected by a circuit to a 2Gbit IC = 8 x 2Gbit = 16Gbit = 2GB), but GDDR5 can also operate in what is known as clamshell mode, where the 32-bit I/O instead of being connected to one IC is split between two (one on each side of the PCB) allowing for a doubling up of memory capacity. Mixing the arrangement of 32-bit memory controllers, memory IC density, and memory circuit splitting allows of asymetric configurations ( 192-bit, 2GB VRAM for example)
•Physically, a GDDR5 controller/IC doubles the I/O of DDR3 - With DDR, I/O handles an input (written to memory), or output (read from memory) but not both on the same cycle. GDDR handles input and output on the same cycle.
The memory is also fundamentally set up specifically for the application it uses:
System memory (DDR3) benefits from low latency (tight timings) at the expense of bandwidth, GDDR5's case is the opposite. Timings for GDDR5 would seems unbelieveably slow in relation to DDR3, but the speed of VRAM is blazing fast in comparison with desktop RAM- this has resulted from the relative workloads that a CPU and GPU undertake. Latency isn't much of an issue with GPU's since their parallel nature allows them to move to other calculation when latency cycles cause a stall in the current workload/thread. The performance of a graphics card for instance is greatly affected (as a percentage) by altering the internal bandwidth, yet altering the external bandwidth (the PCI-Express bus, say lowering from x16 to x8 or x4 lanes) has a minimal effect. This is because there is a great deal of I/O (textures for examples) that get swapped in and out of VRAM continuously- the nature of a GPU is many parallel computations, whereas a CPU computes in a basically linear way.
|My System Specs|
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