Dualcore AMD
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Re(8): Dualcore AMD
15.04.2005, 15:28:05
achwo, der Venice ist vielleicht 1/2% schneller wegen dem Speichercontroller, aber bei mehreren Speicherriegeln soll er noch mit schärferen Timings fahren können. Das ist dann ein kleiner Vorteil. Auch SSE3 könnte irgendwann vielleicht ein bisschen nützlich sein.

von X-bit labs kopiert:
Enhanced Integrated Memory Controller

Every time a new Athlon 64 processor core come out AMD engineers continue tuning up their integrated memory controller. Note that this is done not only for the sake of increasing the processor performance, but mostly in order to extend the compatibility of this memory controller with the different DIMM modules and their configurations. The previous 90nm Athlon 64 processor core aka Winchester had certain performance limitations when four DDR400 SDRAM modules were used. If there were four single-side DDR400 SDRAM DIMMs installed in a system with a Winchester based Athlon 64 CPU, they could only work with the 2T timing, which caused a few percent drop below the usual performance level. If there were four double-side memory modules installed, DDR400 SDRAM would not work at all and its working frequency would automatically drop down to 333MHz.

AMD engineers promised to eliminate this problem in the new Venice core and they did keep their word. Athlon 64 processors based on Venice can work with four single-side DDR400 SDRAM modules without any limitations, and if there are double-side DDR400 SDRAM DIMMs installed, they can work at 400MHz with 2T timing.

Besides wider compatibility of the Venice’s memory controller, it also got noticeably faster. Among the tweaks implemented in Venice we should definitely point out enhanced hardware data prefetch and more write combining buffers (4 instead of 2).

All these improvements should help Venice based Athlon 64 processor to outperform their counterparts based on the older core revisions but working at the same clock frequency. And the performance gain will be more noticeable if there are four memory modules installed in the system.


MfG.

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