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939 3400+ OCing

J

JBird7986

Senior member
OK...so this afternoon, I took off the 3% Auto ASUS AI OC I had and have begun messing with some of the settings. I locked in the voltage at 1.5v, the AGP/PCI-->66.66/33.33 and turned up the FSB from 206-->210MHz, with an 11x multiplier (giving me 44MHz from 2.27-->2.31GHz). I also noticed the voltages in CPU-Z dropped from 1.552/1.568 to 1.448/1.504. Does anyone here think that with my 939 NewCastle, I'll have a problem reaching 2.4GHz (i.e. FSB 210-->approx. 220)? That's all I'd really like out of this processor.

NOTE: Currently 2hrs into running Prime 2004, but I haven't seen ANY sign of system instability yet. Forgot to mention: CPU temps actually DROPPED 3 degrees from 56-53 under load.
 
a bit of confusion here. 3400+ has 800 hypertransport on 939. Your cpu core should be newcastle or CH, which in that case Asus bios puts the voltage @1.55 and you lowered it to 1.5, and with 1.5v you cannot reach 220mhz. I have mine overclocked to 2.7mhz but with 1.65 vcore, but do not try this unless you have good cooling, which you don't because mine is 51c max with 1.65v. you should be fine @ 1.55v and 56c.
 
If I set the voltage back to 1.55 will I be able to make 220MHz you think? Also note that my CPU cooler is only running at 2700RPM. I've turned up the fan, and the temperature under load is falling.
51C under load at 3750 RPMs and it looks like my cooler will go up to roughly 4166RPMs...
 
mine can do 220 @ 1.575, check the the temperatures. As long as it's under 56 you're safe.

Oh and your cooler. I turned off the cpu fan control in bios and it's @ it's max now.
 
Jump to 220 then test prime. If it fails and you dont wantmore voltage, then pull it back down by a couple to 218 and try prime again.
 
It failed at both 218 and 220 on 1.550v. I've lowered the FSB back down to 210. In all honesty, I knew that Newcastles were bad at OCing and I'm happy with the lower (locked) 1.5v and 2310MHz clock. Maybe I'll try again tomorrow.
 
are you running that ram on a divider, if not , that is probably what is limiting your overclock. Try running the ram at 1:2 or 100 and then up the fsb to 220. I am willing to bet that it will work.
 
you can do 2.4ghz EASY...that's only 200mhz..bump it to 2.4ghz now!! but make sure ur memory can handle it...but NOW!!
 
I'm not sure about the A8V as I have an A8N-SLI, but it should be labeled as Memory clock or something like that. Different boards list them as different values

Here are the four most common settings I've seen, I think your A8V may be the last one

DDR400=200=1:1=2:1
DDR333=166=6:5=1.66:1?
DDR266=133=3:2=1.33:1?
DDR200=100=2:1=1:1
 
That looks approximately correct. So to do this, I set the memory clock to "Limit" and move down in terms of speed from 2:1-->1:1?
 
Yes, thats correct. 1:1 should run your ram at half of the HTT speed. With this setting you should be able to find your best CPU overclock without ram limiting you.

Once you find your best CPU O/C, you can use a larger divider to run your ram near 200mhz
 
Originally posted by: JBird7986
Does anyone here think that with my 939 NewCastle, I'll have a problem reaching 2.4GHz (i.e. FSB 210-->approx. 220)? That's all I'd really like out of this processor.
Click to expand...

TD deal eh?

I've got the same proc running on an A8N-SLI, I can hit 2.4 no prob. I can prime 95 at 2.5 for hours.

Have u looked at the quick, and dirty OC guide:thumbsup:
 
I did...I tried running the RAM divider, but I couldn't get the thing to be stable at 1.55v. I'm a little jumpy at going over that mark, especially as my board has a tendency to overvolt. At any rate, it would appear that I've found the "sweet spot" for this processor at 1.5v.
 
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