Manual Memory Timing + Ratios on Alienware 18 R1

Hey guys,

I've been experimenting a bit with the memory timings / memory ratio on Alienware 18 R1 (BIOS A10), and noticed something strange:

With Corsair 2133MHz memory installed and the timings set to Default, the memory runs at 933MHz = 100MHz FSB * 28/3 ratio, effectively being 133MHz * 7 ratio.

When try I manually setting the ratio, the base clock becomes 100MHz - so if I set the memory ratio in the BIOS to 8, the memory runs at 900MHz (I'm guessing it's zero-indexed) as in the screenshot.




I'm still experimenting to see if I can reach anything higher than 933MHz, but I had two questions:

a) Is there a way to force 133MHz BClk while controlling the ratio?

b) Is there a way to have the memory run at 933(1866)MHz while controlling the timing manually?

Thanks in advance - also, I don't know if anyone's noticed, but the BIOS memory settings show two tRC settings.....

 

And here is the memory running at 2000MHz on R1!


Still need to do stability testing, but I'll post BIOS settings later if it works.

 

NM - found it; the "Memory speed" option just needs to be set to 2133MHz (base clock = 133MHz). I was just getting page errors before I could access programs to show it because of bad timings.

I've gotten the modules to work at 2133MHz (133 x 8) as designed, and also at 2200MHz (100 x 11).

 

Hi, I have a very simple question, I have been trying to overclock it. But for some weird reason, the base clock is always 100MHz, I have tried 2133MHz, but still it doesn't work, the default speed is 1600MHz, I have gotten it to work on 2000MHz no problem, the timings are default, would you know the reason of this problem? pls let me know. Thx in advanced.