[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: 6,466	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. __________________

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
ASRock 890GX Extreme3 AMD Socket AM3 DDR3 Motherboard Review	jmke	WebNews	0	26th April 2010 13:03
GIGABYTE MA790XT-UD4P AM3 DDR3 Motherboard Review	jmke	WebNews	0	24th February 2010 15:00
ASRock M3A785GXH/128M AMD Socket AM3 DDR3 Motherboard Review	jmke	WebNews	0	30th November 2009 13:39
ASRock M3A790GXH/128M AMD Socket AM3 DDR3 Motherboard Review	jmke	WebNews	0	1st October 2009 14:57
Gigabyte GA-MA770T-UD3P Socket AM3 DDR3 Motherboard Review	jmke	WebNews	0	4th September 2009 12:35
Overclocker DDR3 for Socket AM3	jmke	WebNews	0	6th June 2009 10:07
Asus M4A78T-E AM3 DDR3 Motherboard	jmke	WebNews	0	16th March 2009 16:37
AMD Phenom II DDR2 vs. DDR3 Performance	jmke	WebNews	0	12th March 2009 16:01
AMD Phenom II AM3 CPU Has Arrived, DDR3 for the Dragon Platform	jmke	WebNews	0	9th February 2009 09:18
AMD’s DDR3 comes with socket AM3 /G3	jmke	WebNews	0	6th September 2007 09:24