AN35N-Ultra Questions

[RetroGrade]

I've had this mobo for a while and it has to be the best motherboard for the money. I have my 2400+ Mobile running at 2448 mhz with 204*12. If I try to go 205 or above, it refuses to boot. I have tried 11*219 and it worked fine. However, when I try to go 220 it won't boot either. (I let mem timings be "Optimal" and "By SPD." The voltage is auto or default, I'm not sure.) Could this be Nb related? I have not modded the mobo at all. Is there anything I can do to crank out the last drops of the mobo so i can OC more?

 

[funnyperson1]

Well the by SPD option can often not work well. So I would try setting the divider to something insanely low like 50 or 60% and high timings, then see if you can boot at those FSBs.

Really I think it might be your cpu getting a little flaky after 2400mhz, try 10x220 and see if that boots. I'm thinking that while 204x12 and 219x11 may boot, they may not be entirely stable.

Try using a cpu stress program to test it out.

 

[etherboy]

When you talk about voltages, which ones are you referring to?

Obviously you will probably need to add a little juice to the V-Core, even though the Mobile Athlons are designed to work from a base voltage of 1.45v (AFAIK)...

I would make 1.8v your upper limit (double-check this though - I'm no Mobile Athlon expert and up it in little steps from 1.5v...

As mentioned, drop your memory timings to the "loosest" numbers possible, but leave the memory clock to "100%", as you are probably going to want to keep your memory and FSB in-synch... (obviously there is a point where gains on the FSB outweigh the desire to have a synchronous FSB:Mem clock, but on Barton processors, a synch bus is desirable)...

If you can get the machine to boot with the loose timings at your desired clock, you can simply "tighten" them step by step until you find the threshold...

Also let me just say as well you should test any overclock with a stress-program (like PRIME95) to ensure stability... I suggest booting into safe-mode to do the testing...

 

[funnyperson1]

Well the reason I said to do the memory at a lot lower FSB was to make sure that he absolutely was not being held back by it. First determine what speed the CPU is stable at, and then determine what speed/timings the memory can do. Isolating components is always a good idea.

I also missed where you said you were using stock voltage. Definately increase that, like etherboy said you will probably be safe up to 1.8, just make sure your temps are in check. You will probably also want to run the ram at 2.70 volts, some sticks wouldn't even boot before I did that.

Also etherboy makes a great suggestion with prime95, it is the best ram and cpu testing program I know.