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jmke 23rd February 2011 10:46

DDR3: Impact of channels & timings
Since the advent of DDR3, the question of the impact of memory on overall machine performance seems to have been pushed into the background somewhat. While all discussion on DDR2 was focussed around latency, moving across to DDR3 moved the goalposts.

This is partly because of certain decisions taken by JEDEC for the official DDR3 specs. The accent was put on reducing energy consumption and increasing bandwidth.

In the meanwhile, memory controllers have adapted to these changes, most importantly with the integration of the memory controller within the processor (historically it was built in the northbridge). AMD adopted an on-chip memory controller in 2003 with its Athlon 64 (with DDR memory at the time). Intel brought this in later with the introduction of its Core i CPUs (socket 1366 and 1156). Processor memory cache has also increased in size and level 3 cache has been rolled out across the board to better hide latency. The impact of this went as far as the pipelines because pre-empting memory operations as soon as possible has become a sine qua non for architecture engineers.

jmke 23rd February 2011 10:49


With a gap of up to 20% between the fastest and slowest, memory speed makes a real difference in GTA IV. Once again increasing the clock has more of an impact than timings. This is the test which demonstrates the best use of available additional bandwidth, whether triple channel with the Core i7 1366s or faster clocked memory with the LGA 1155s.
interesting find, slowest DDR3 is quite slow, most expensive DDR3 might not be worth it though

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