The substitute product of the tiddlywinks with success P965, P35 as well as supports thus officially the FSB 1333 megahertz the DDR3 up to 1066 megahertz, although only certain models of the councils of mother are available for the sites necessary. The DDR3 functions according to the same principle as the DDR2, namely to divide again by two the internal frequency of the pieces but to double in parallel which the quantity of data transmitted by the cycle (it is said to him that the prefetch passes to 8 bits), to reach the beach of the frequency of 800 - 1600 megahertz, against 400 - 800 megahertz for the DDR2. The official beach certified by the JEDEC naturally, since in practice the most aggressive manufacturers exceed the 1200 megahertz with the DDR2.
The greatest interest of the DDR3 will remain at the beginning its consumption reduced, obtained in particular via the reduction of the supply voltage (1.5 V instead of 1.8 V for the DDR2, which results from the passage to the 0.09�). The escapes from the current moreover are limited via the use of the transistors to 2 grids. With the finale the benefit in consumption the 25% between the DDR3 and the DDR2 would exceed on modules 800 megahertz, and the DDR3 1333 megahertz would not consume more than the DDR2 800 megahertz.
Because an external frequency moreover increased, other optimizations are employed while a direct connection of each memory of piece between them via the order and adress buses, instead of a topology in T. to finish, an interesting functionality is in the addition (optional) of a temperature sensor which employed well could also make it possible to save energy within the framework of the portables (but not before the next year thus), and to check fortuitous the utility of the radiators of the bars.
Remain that the agreement of the prices of the DDR3 with those of the DDR2 was fitted only one certain share in 2008, and that while waiting of this memory will remain in 2007 very expensive and thus of a worse report/ratio/price of executions than the DDR2.
The report/ratio of controller was thus improved, but not only via the support of the DDR3: the fast access report of technology was added. Enough near in the principle with the NCQ, it makes it possible to reduce the latencies caused by the tiddlywinks and to maximize the core use of bandwidth. Its principle of operation consists of analyzing the queue of the requests of the reading in the memory, in order to determine those which want to reach the same pages. They then will be collected independently due to the fact that they were subjected to various moments and that other requests were inserted between them. With the final, the new controller will have finished his queue before the precedent, and less preloadings and of activation of the pages will have been necessary.
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It is not all: the cycles not used are also identified in order to draw benefit from him to become exhausted the queue about the requests to write this time.
It is advisable to note that this reorganization does not refer only to the requests placed on the FSB, but also those of the integrated graphic circuit, of the express train of peripherals NCV and the DMI (direct interfaces of media).
This functionality should allow a great benefit in the executions compared with P965 running, including with simple DDR2.
To finish the side northbridge, P35 presents simply the possibility of controlling memory DDR2 1066 megahertz and one or the other 800 megahertz. On the one hand, the possibility of desynchronizing completely (in bottom including) the frequency of the RAM and the FSB, according to the example i975 and the nForce 6 so will be reserved for X38. What however simplifies the overclockings and makes it possible to save on the level of the memories of bars.
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