[GD70] - AM3 and DDR3, time to apply DDR2 timings. - Page 2

Massman · 30th May 2009, 15:13

Could indeed be a limiting factor as well, although the difference shouldn't be this big.

The only way I can be sure it's the cpu is by changing it and check the difference in overclockability.

Massman · 7th July 2009, 23:32

Quote:

Originally Posted by Massman

The results are good, but not excellent. I reckon the AM3 could benefit from 1GHz CL7 even in terms of latencies, but the current technology just doesn't allow us to go beyond 900MHz stable (and even that is quite difficult).

I'm not sure if it's IMC-quality related. I'd sure like to test (another) 955 to check if I can get >900MHz or not.

Basicly, the limitation of a maximum memory overclock of 960MHz (1920CLx) is a technical limitation in the CPU's IMC registry. To set the memory frequency, there are apparently 3 registry values used. Now, to increase the frequency above 960MHz, you actually need a 4th value. With 3 values, the maximum possible frequency is just 960.

This is the very basic version of the story, but I hope it makes at least some sense. The main idea to remember is that the limitation really is tech-related and cannot be solved by an easy bios update. I was told that this bug was fixed in the new 6-core chip: a fourth registry key has been added to increase the memory frequency. No words yet on the added performance using memory >1GHz, though.

30th May 2009, 15:13	#11
Massman [M] Reviewer Join Date: Nov 2004 Location: Waregem Posts: 6,465	Could indeed be a limiting factor as well, although the difference shouldn't be this big. The only way I can be sure it's the cpu is by changing it and check the difference in overclockability. __________________

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