DDR memory problems?

[sastusbulbas]

Hi,

I recently bought a new Asrock 4CoreDual SataII motherboard to use some old bits with. It came with stock bios P2.00

With this I could get a maximum 12.5X220 OC on an Intel E5200 taking me from 2.5 to 2.7.

My DDR400 (Corsair XMS Pro 2gb) would automatically go up to 220mhz with the above OC?

I then updated my Bios to 2.13a to allow me to use more memory later. At this point I noticed my memory was running at 180mhz, I overclocked to 2.7 and got 200Mhz from the memory, then up to 3.0 and got 2.08 Mhz from the memory.

This morning I adusted the memory within the bios and it would not boot, I did a manual adjust on my timings, as specified by Corsair, and changed my command rate from 2T to 1T I am unsure if flexibility was disabled or not, but I think I switched this?

Anyway, with teh CPU on stock I am now getting 133Mhz from my memory instead of 200Mhz, and I know this memory is capable of 220Mhz?

Any ideas where I have went wrong?

Cheers,
Steve

 

[sastusbulbas]

Update,

I reset default settings and started again, flexibility was disabled.

I set my timings manually and am at 199.5Mhz with 2/3/2/6 and a 1T command rate, my FSB Dram is 1.1.

FSB Dram had been 3.1 for some reason earlier with 133mhz at 2/3/2/6 and a 1T command rate?

Am I right in thinking this should be 1.1?

Edit,

Had another go, leaving the above on manual settings the computer would not boot with a 12.5 X 240 multiplier. I had to again set all memory options to automatic.

I now have the E5200 running at 3Ghz with a 240Mhz bus speed and a 960Mhz rated FSB, but the memory is at 200Mhz with an FSB DRAM of 6:5 , 2.5/3/2/5 and a 2T command rate?

Would I be better with the E5200 running at 2.7Ghz with DDR memory at 220Mhz with 2/3/2/6 and a 1T command rate, and FSB Dram at 1.1?

Edit,

Had another go.

Seems the highest I can go and boot into windows is 12.5 X 250 but I still seem to have to leave all memory settings on auto.

This gives my E5200 a 3125.2Mhz speed , 250Mhz Bus speed, 1000Mhz rated FSB. memory is automatically set at Dram Freq 208Mhz, FSB Dram 6.5, 2.5/3/2/5 CR 2T.