DDR3 - Evolution continues

When we are talk about changes in chipsets, processors and many other computer components, man always think of RAM. Not only because the evolution
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there takes place with much lower pace, but the fact that most consumers pay more attention to the amount of memory rather its type. We do not comment the speed - the things here are evern more complex. Whether DDR333, DDR400, DDR600, DDR2-800 or even 1066 MHz - only enthusiasts and fans of overclocking are interested in these exact values. And while we rely on the reduction of timing in DDR2, currently on the market is steady entering a new generation - DDR3. Familiar to many manufacturers of graphics cards, DDR3, as regards the use of system memory is a little different level.

DDR2 to DDR3 ram memory

The transition from SDR to DDR was noted as the first major change in the transmission of data - it can now be processed faster. Thus 200 MHz effectively turn into 400, so that DDR400 memory is actually operating at 200 MHz, and DDR333 - 166.

The move to DDR2 was accompanied by a doubling of the real rate of I/O buffers and preserving the frequency of cells. Thus DDR2-533 memory cells work on 133 MHz, while the I/O buffers are already operating at 266 MHz, from where we receive the effective 533 MHz. If you compare the frequencies of DDR1 and DDR2, it appears that at 800 MHz DDR1 effective cell will operate at 400 MHz, while DDR2 will be 200 MHz.

Increasing latency with DDR2 works exactly in the opposite direction of the effective bandwidth, which is why at standard settings and the same frequency DDR1 quite some time had an advantage. This DDR2 which failed to overcome its shortcomings, was much higher frequency, lower latency and, of course, reduced consumption (caused by the lower frequency of memory cells).

What happens with DDR3?

With DDR3 things are repeated again: the frequency of cells remained the same, but the effective transfer is doubled, thus for DDR3-1600 memory there are 200 MHz for cells and 800 MHz for the I/O buffers. If we directly compar it to DDR2, DDR-DDR2 dependence applies: DDR2-800 and DDR3-800 will differ in the main clock of the cell buffers and latency of - 200 to 100, 400 to 800, but with regard to latency this is a more complicated matter. DDR3 will see new heights in the timing of memory, according to the JEDEC DDR3-1600 9-9-9-27 officially set. For fans and 2-2-2-5 DDR1 and DDR2-800 9-9-9-27 3-3-3-9 using a straight head-spinning. But as we already mentioned, some latency alone do not define any theoretical or actual bandwidth that we can make use of DDR3 at the appropriate frequency. Naturally, DDR2-800 memory at this frequency and timings 3-3-3-9 will show much lower latency in nanoseconds to DDR3-800, but while DDR2 now starting to show weaknesses as regards the achievement of significant frequencies ( without the use of excessive pressure and excessive cooling) for DDR3 is just starting the game - have announced starting frequencies up to 1666 MHz, which is quite feasible under standard conditions for DDR2 now. So to say saga Does DDR, or DDR2 "starts again, but in a newer, evolved way.

Sunday, April 26, 2009 7:27 AM Posted by Someone

DDR3 reaches DDR2's market

The volume supply of DDR3 SDRAM is growing rapidly while sales of DDR2 reduced. The prices of both types of memory are close to each other, which is due to the growth in popularity of DDR3. During the fourth quarter of the last year the proportion of DDR2 in total supply of dynamic random access memory was 48% and the share of DDR3 is 35%.

According to forecasts of analysts this year DDR3 will accommodate the first place, but thanks to high demand the price of such memories will remain higher than that of DDR2. The average price of memory implemented in the fourth quarter of 2009 was 2.77 dollars to 1 GB, that is $ 0.95 more than their value year earlier. Based on data from specialized site DRAMexchange, May 4 at the average price of 1 GB DDR3 e 2,9 dollars, and that of DDR2 - $ 2,6.