The ASUS M2N-SLI and M2N32-SLI Club! - Page 264 - Overclock.net

ZerotoHero · 07-02-09

Thanks N2 gaming

Ive updated my system specs.

I haven't even touched the fsb yet as Ive only had the 940 a little while.

Initially I couldn't get it stable at 3.6ghz (upping the multiplier to 18) at no matter what volts i used.
I set my ram timings to auto and everything has been perfect since.
Doesn't make sense to me as i haven't touched the ram speed.
Stock its ddr2 800 @ 4 4 4 12, but with my old cpu (4200 x2) i ran it at ddr2 980 @ 4 4 4 12 without a problem.
I volt it at 2.3v which is the manufacturers maximum recommendation.

Any thoughts...

N2Gaming · 07-02-09

ZerotoHero, I got you on the Roster now. Thanks for editing your system info.

Your new x4 940 would prolly like a higher HT link and NB Frequency but that would put a lot of strain on the mobo so the way you have it now is just fine. I think your best oc would be just adjusting the multiplier on your cpu and playing w/your ram timings. Then again my opinions/therories are based on me killing a mobo w/this X4 940BE cpu.

So take what I say w/a grain of salt. The x4 940 CPU is right at our mobo 125w limit and once you start overclocking the cpu & your FSB you could get a lot of heat/strain build up and eventually burn out your power regulator circuits. I like that you have set your ram timings to auto and all is working just fine for you.

ZerotoHero · 07-02-09

Thanks again dude

How do you know how much power you are pushing through the motherboard?

Im tempted to play with the fsb like on my previous cpu but dont want to kill it.

N2Gaming · 07-03-09

I don't fully understand what you are asking me. Could you explain differently what you mean by power you are pushing through the mobo? Are you refering to voltages or Watts and what part of the motherboard are you talking about. The CPU or RAM. I think you are asking how do I know how many watts your mobo is running. Your mobo supplies your cpu w/the current needed to power the cpu. The cpu is @ factory settings 125w. Now I don't know if the cpu draws 125w at idle but I'm sure it draws it when it has a full load. So when you overclock the cpu it requires more watt's from the motherboard to maintain a stable system essentially drawing more watts from the motherboard then it's default 125w. I think that's how it works. I'm not an expert on the topic. We have other members here that know a little more about calculating wattage draw by the overclocked numbers that you produce i.e. FSB 225 x 15 CPU multi = 3375MHz @ the cpu. That would be a 375MHz overclock. Honestly I don't know how to determine the power usage.

Hope this this information helps,

N2G

**thlnk3r** · 07-03-09

Quote:

Originally Posted by ZerotoHero

Initially I couldn't get it stable at 3.6ghz (upping the multiplier to 18) at no matter what volts i used.
I set my ram timings to auto and everything has been perfect since.
Doesn't make sense to me as i haven't touched the ram speed.
Stock its ddr2 800 @ 4 4 4 12, but with my old cpu (4200 x2) i ran it at ddr2 980 @ 4 4 4 12 without a problem.

ZerotoHero, setting sib-timings to Auto might of also adjusted the memory frequency/divider to compensate for the overclock. At 3.6Ghz what is your memory frequency sitting at?

Good luck

eclipseaudio4 · 07-03-09

Ok correct me If I'm wrong but,
The 940 @ stock is a 125W tdp CPU.
The board is rated to handle 125W cpu's MAX.

That being said If you OC the cpu you are also essentially OC'ing the VRM's as well. So If you can keep them cool you should not really have a prob until you get to maybe 200W TDP (just a guess but this is ASUS) If you tell me what your vcore and CPU speed is I can tell you the TDP. Also remember that as your TDP increases your safe opp temps go down. So It may be that what it takes you to get above 3.6 would make the chips too hot for them to function correctly even tho at a lower TDP they would be fine. Another thing I would try is to underclock the heck out of your ram and HT to see If they are the issue. I would also look at your NB frequency because If I remember correctly with our boards we cannot change the Multi for it.

Darn got beat while looking over my post for changes.

**thlnk3r** · 07-03-09

Quote:

Originally Posted by eclipseaudio4

If you tell me what your vcore and CPU speed is I can tell you the TDP.

Eclipseaudio4, can you give us an example? I'm a bit curious on this conversion. Say my Vcore is 1.425 and my cpu speed is 2.8Ghz. This is all on the same board with a PhII 940.

Let us know

Thanks

eclipseaudio4 · 07-03-09

That would be 163W TDP. Really the board does not matter it's all about the CPU.
These are rough estimates really but are very useful and quite close.

TDP = Stock TDP * (MHz / Stock MHz) * {(voltage / stock voltage)^2}

Sorry forgot some {}'s

Ok example. My Brisbane X2 5000 Stock TDP =65W
So X=65*(3615/2600)*{(1.55/1.35)^2}
X=65*1.3903846153*(1.1481481481^2)
X=65*1.3903846153*1.3182441699
X=90.375*1.3182441699
X=119.13631686
So Oc'd TDP = 119W

BTW for any non belivers of my 1Ghz OC check the sig. lol

**thlnk3r** · 07-03-09

Quote:

Originally Posted by eclipseaudio4

That would be 163W TDP. Really the board does not matter it's all about the CPU.
These are rough estimates really but are very useful.
tdp = stock tdp * (mhz / stock mhz) * (voltage / stock voltage)^2

Eclipseaudio4, awesome thanks buddy. I bookmarked your post for future reference

ZerotoHero · 07-03-09

Im talking about watts.

As you mention the 940 draws 125 watts and when we overclock it draws more.

Im trying to figure out how much more it draws and what is a safe limit before we cook the board.

My cpu is at 3.6ghz and my voltage is set at 1.325v in the bios and shows 1.376v in cpu-z

My fsb is untouched as ive just used the multiplier to get to the overlcock

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