P7N Diamond RAM Problems

Question

Hello,
first of all sorry for my bad english. I have an Acer G7700 Predator after a Board mailfunction i bought a "real" P7N Diamond. After assembly i got some problems. The system bacame instable. I have an qy9650 Extreme with 4 x 2 GB Kingston KHX8500D2t1. When i set all Bios options in cell menue on AUTO the regonize the RAM as 800 MHZ Ram with 400 Mhz DRAM Frequency. This seems to be the right default settings. In the hardware maintaince manual of Acer the FSB is set to 1333 Mhz with a DRAM Frequency of 400 MHZ. With this setting my system becames extreme instable. So i set the DRAM Frquency to 533. The System runs over 2 hours stable with rigth mark memory tester. After that i set the DRAM Frequence to 333 MHZ to get an 1:1 DRAM FSB ratio. Systems runs stable. Now i wonder how i get the RAM work into 400 MHZ Mode ? Mabye i need some instruction to understand the dependency between FSB-DRAM.
 

Answer 1

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Is it important to have an FSB:DRAM Ratio of 1:1 ?
No, not at all.
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How much  difference is between 667 and 800 Mhz ?
DDR2-800 will, of course, be faster.  Only a couple of percent, but definately noticeable in benchmarks.
DDR2-800 is usually not a problem.  However, the fact that your are using four modules puts a lot of stress on the memory controller and on the memory bus in general.  That is why it sometimes takes slight voltage bump to get things stable.  As I said earlier, 1.95V should be enough.  Perhaps 1.9V already is.