Overclocking Xeon Mod
Overclocking Xeon Mod
I run a DDR2 6400 (800Mhz) at standard speeds but lower it to 3.6 Ghz. RAM operates at 760 Mhz with a 1520 Mhz FSB, supporting 6 GB. For 4Ghz, I used Patriots 4x1GB high-speed memory which was overclocked to around 842Mhz.
I think the problem isn't the RAM itself if it works with the FSB: DRAM and FSB ratio is 1:1.
I use DDR2 6400 at default speeds but lower it to 3.6 Ghz. RAM runs at 760 Mhz with FSB 1520, 6 GB. For 4Ghz I switched to Patriots 4x1GB memory which was overclocked to around 842Mhz. I think the problem isn't the RAM if it works with the same FSB. My CPU-to-RAM ratio is 2:3, but I want a 1:1.
For p5b in bios the settings display appears as follows:
example :
CPU frequency - 380 Mhz
DRAM frequency - 760 Mhz
380 Mhz equals the FSB / DRAM frequency, which is twice the FSB, indicating a 1:1 ratio
this applies to older ASUS motherboards
I'm not certain about your BIOS configuration and the values it shows, but you could adjust it to something like 400 Mhz
(as suggested by pictures from other OC forums)
CPU frequency = 400 Mhz
DRAM frequency = 400 Mhz
(consistent values)
Please try with a lower FSB initially.
xeon_fan :
the bios settings display different values. for example, the cpu frequency is shown as 380 mhz, while the dram frequency is 760 mhz. this means the fsb equals twice the fsb, giving a 1:1 ratio, which was typical on older asus boards. i’m not sure about your bios configuration or the frequencies it shows, but you could adjust them to something like 400 mhz for dram. (based on pictures from other forums). for instance, setting cpu frequency to 400 mhz and dram frequency to 400 mhz would work. of course, try a lower fsb first. the dram frequency should be around 500 mhz, like in some cases, but it depends on your setup. the ratio status is unlocked min 06 to max 09, cmos setting is 9, intel speedstep is auto, overclock mode is manual, and pcie frequency is 100. ... voltages on auto. you should get consistent numbers on fsb and dram as you mentioned."