From [H]:
(Also check your Abit manual, they are pretty good at explaining things)
The N/B Strap CPU As and DRAM Ratio (CPU
RAM) options are used in conjunction with one another to determine the memory speed based on the CPU FSB selected through the Ext. Clock (CPU/AGP/PCI) option. In practice, it has been found that the N/B Strap CPU As option only takes effect when the setting selected is equal to or below the current CPU FSB. If the N/B Strap CPU As option is set to a higher setting than the current CPU FSB, the setting is ignored by the system, and the RAM will run as determined by the SPD settings. The following charts goes through the divider options available through the DRAM Ratio option with each of the various N/B Strap CPU As options selected.
N/B Strap CPU As DRAM Ratio (CPU
RAM)
By CPU 1:1 (533, 800 MHz CPUs)
3:2 (800 MHz CPU)
3:4 (400 MHz CPU)
4:5 (533 MHz CPU)
5:4 (800 MHz CPU)
By SPD (DDR speed determined by internal memory circuitry)
PSB400 3:4
By SPD (DDR speed determined by internal memory circuitry)
PSB533 1:1
4:5
By SPD (DDR speed determined by internal memory circuitry)
PSB667 1:1
5:4
By SPD (DDR speed determined by internal memory circuitry)
PSB800 1:1
3:2
5:4
By SPD (DDR speed determined by internal memory circuitry)
Have you got a P4 b or c?
Additional voltage to cpu and mem may assist in stabilizing your OC
----> OOOPS I see you have a b---try the 3/4 400 (just for kicks) and the 4/5 533 and run Sandra memory bench and check the results between the 2...
Linear Mode
