PC won't boot with anything other then DDR200 in bios

[SlowSpyder]

When I ran my old single core CPU I was able to run 320htt x 8 for a 2.56ghz speed. With my current Opteron I run 300 x 9, the CPU is stable at the 2.7ghz speed. With both CPU's I was not able to ever run anything other then a DDR200 divider. If I set the divider to a DDR333 speed (shoud result in DDR400 speed actual due to the 300mhz HTT) the PC will not boot. Not won't boot as in Windows won't load, more as in you hit the power button but the monitor acts as if it doesn't recieve a signal from the video card and the PC just beeps at me. Because of the DDR200 divider I'm stuck at only a 300mhz DDR speed. So, my options are to raise the HTT and lower my multiplier or find out why I can't run my memory at the rated speed when my HTT is anything but 200mhz.

For the record, if I run everything at the stock speed (200HTT x 9) I can run the DDR at full DDR400mhz speed.

Now, my old CPU had no problem with a 320HTT, my current CPU will not boot with anything over a 300mhz HTT. I can increase my HTT voltage, would that help? I've already pushed my DDR voltage to 2.7 with no change in the outcome. Lastly, I run my chipset at 1.6volts.

Sorry, I know I jumped around a bit. Any help is appreciated, I'd like to get my missing memory speed back.

 

[3chordcharlie]

DDR 333 setting would give you ddr500, not 400.

 

[SlowSpyder]

DDR266 maybe I meant? I'm not infront of my PC right now (at work). I think I mean DDR266 setting.

 

[3chordcharlie]

That would be the right setting. I think some boards had issues with some dividers when overclocked. You can try voltages and whatnot, but you're probably better off with slower ram if you have to choose.

 

[WaTaGuMp]

Could it be an issue with 4 sticks of ram cause some mobo's can be picky about 4 sticks

 

[SlowSpyder]

I've tried 4 as well as 2. I've also tried two different CPU's, no combination could get the PC to boot at anything but the lowest speed divider. I'm not sure how much of an issue it is anyway, it is running in dual channel mode atleast. If I can't get the speed correct, then I will try and see if I can tighten the timings a bit. If the memory is running slower then it's rated speed, is it reasonable to assume that I might be possible to better the timings then what is advertised for the rated speed?

Thanks for the replies.

 

[WaTaGuMp]

Originally posted by: SlowSpyder
I've tried 4 as well as 2. I've also tried two different CPU's, no combination could get the PC to boot at anything but the lowest speed divider. I'm not sure how much of an issue it is anyway, it is running in dual channel mode atleast. If I can't get the speed correct, then I will try and see if I can tighten the timings a bit. If the memory is running slower then it's rated speed, is it reasonable to assume that I might be possible to better the timings then what is advertised for the rated speed?

Thanks for the replies.

Check your command rate maybe I know for my mobo the A8N SLI 4 sticks would not run using a T1 command rate only T2 would boot up and I dont even overclock.

 

[SlowSpyder]

I have the command rate set to auto, CPU-Z shows 2T in Windows.

 

[Yellowbeard]

I am assuming you have flashed the latest bios. For the command rate, I would not trust AUTO, set it manually to 2T.