Massman | 25th May 2009 20:46 | Still on air cooling.
I'm trying to reduce the memory latency by reducing the memory divider from the very slow 1066 to 800, but it seems that the increase in HTT frequency (240 -> 325) makes the sideport memory to act up. I have a hypothesis about the problem.
My motherboard is capable of running 533MHz on the sideport memory. Anything higher than 533 (which is the 667 option in the bios) results in an overly artifacted screen, which is a symptom of the memory being overclocked too high. It seems to come down at 667MHz being too much for the sideport memory.
Now, the bios options offered by Asus (533/667/700/...) come across as fixed frequencies. In other words: we think we can set either 533MHz or 667MHz or and so on. Now, I have good reasons to believe that these frequencies are, as everything of the AM2 platform, derived from the HTT frequency, which can also be described as the base frequency. So instead of the three-digit values, we have to see the values as a fraction: 533/200, 667/200 et cetera.
Now, I'm unable to use the following combinations (sideport-htt):
*533/325 => 866MHz real
*533/242 => 645MHz real
*700/200 => 700MHz real
This was part 1 of the puzzle. Part 2 is the actual reason why I'm unable to run 325MHz HTT in combination with (any divider) sideport memory.
Looking at the screenshot I've already posted above, I think you should all be able to guess the reason :) |