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Help: Overclocking Phenom II 740 x3 Unlocked 4th Core

post #1 of 34
Thread Starter 
Here's a summary of what I have done so far:

I have unlocked the 4th core on my Phenom II 740 x3 to a Phenom II 40 X4.

I have it running right now @ 3.4Ghz and 1.45v. This is as stable as I can get it without upping the voltage. Temperature increase has not been a problem for me, the hottest it gets while running Prime95 is 48c. What's the maximum I can bump it up to? Also could I get others opinions/experiences with this? I'd love to hit 3.6ghz or above.

Also I have another question as well, does ACC help at all? If so, in what ways? I have it on Auto right now.

I'll supply my rig details so you guys can help out.

Mobo: Biostar A770E
Memory: G.SKILL RIPJAWS 1333 2gb x 4 w/ Timings of 7-7-7-21 2000mhz
CPU Cooler: http://www.newegg.com/Product/Produc...82E16835118034
NB: This is running at stock voltage.
CPU: Unlocked Phenom II x4 40 @3.4Ghz(x16.5) 1.45v

If you need any other information just ask.
Edited by Theminatar - 1/7/11 at 12:16pm
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post #2 of 34
I thought acc was required to unlock the chip?

my chip the max voltage I have been told is 1.5. The phenom IIs like cold to overclock. what are your temps under load currently?
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post #3 of 34
That board has no voltage regulation cooling (I actually own one), I would caution you about cranking the voltage too much on it without installing some. Voltage fluctuations at high temperatures on the MOSFETs can contribute to system instability (the worst was an Asrock board I had with no MOSFET cooling, voltage was +/- 0.1v!).

Aside from that, OC using the FSB
Drop the memory divider, NB divider and HT divider according when you do so
There's a guide here for 1055Ts that I wrote that applies to pretty much all AMD processors: http://www.overclock.net/amd-cpus/72...ners-club.html
For instance, with my 1055T I can hit 3.96GHz but not 4.00GHz stable, so FSB helps by letting you select slightly smaller clock frequencies
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post #4 of 34
Thread Starter 
Firstly, thank you for the fast responses. I am new to overclocking, but I have th basics down pretty well. Could you explain to me what FSB is please? Also, I have my CPU freq set to 207, how does the freq effect the ocing?

Would it be possible for my CPU to hit 4.0Ghz with my cooler?
My Idleing temps range from 18c - 23c. I have two 120mm fans that push 90cfm directly onto the mobo, they are mounted on the side of my case, I have two 80mm fans that pull air out, mounted on the top. one 120mm exhaust and another 120mm intake in the front.

Sorry for asking a lot of questions, but it's essential for learning, haha.
Edited by Theminatar - 1/7/11 at 12:34pm
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post #5 of 34
2nd the notion of overclocking using the FSB/HT-link along with multiplier.

I got a much more stable, higher overclocking running on less voltage when I combined both methods. Some chips like the FSB overclock more - all chips deal with a combination of FSB and multi best.

Keep your temps below 60 degrees C at load when stress testing (preferably under 55), and your average load temps will be 5 or so degrees cooler. Keep your voltage at or below 1.5v for 24/7 usage.

OP - fill in your system specs under [UserCP] menu at the top; find [add system] on the left hand side. This will help in your endeavors on here ...

Follow the guides you'll find on the net for overclocking AM3 chips - lowering NB and RAM multi's, increasing the FSB 5 or 10 points at a time, adjusting volts where needed. Repeat until limit found, then repeat for NB and RAM, combine for the best compromise of all three components.

Notes - RAM speeds are least important, as timings can be adjusted to make up for it. I suggest aiming for the highest NB overclock possible, placing the CPU in 2nd priority and RAM follows up in third priority placing.

AMD CPU's LOVE a high NB overclock with tight RAM timings. Ram speed is fine between ~1300-1600; timings should be aiming towards CL6 or 7 for this range. NB speeds should aim for ~2600mhz, higher is gravy.

These settings will jump your minimum frames in games much higher than a simple CPU overclock, and will give you the real world difference you are looking for. From the sounds of your chip, and assuming the standards I've heard other people experience, you can expect a similar overclock as I have in my sig rig, again, dependent on the rest of your components.
Edited by willibj - 1/7/11 at 12:39pm
post #6 of 34
fsb * cpu multiplier = cpu speed
fsb * nb multi = nb speed
fsb * ram multi = ram speed.

so when you oc by fsb all speeds change. when you oc by a multiplier just the speed for that item changes. The fsb oc allows for more precise numbers.

As you up the fsb be aware of the speeds of your other parts and lower the multiplier to try and keep them at or below stock speeds. Then you can up their speeds later if you want. This keeps them from limiting your cpu oc
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post #7 of 34
Quote:
Originally Posted by Theminatar View Post
Firstly, thank you for the fast responses. I am new to overclocking, but I have th basics down pretty well. Could you explain to me what FSB is please? Also, I have my CPU freq set to 207, how does the freq effect the ocing?

Would it be possible for my CPU to hit 4.0Ghz with my cooler?
My Idleing temps range from 18c - 23c. I have two 120mm fans that push 90cfm directly onto the mobo, they are mounted on the side of my case, I have two 80mm fans that pull air out, mounted on the top. one 120mm exhaust and another 120mm intake in the front.

Sorry for asking a lot of questions, but it's essential for learning, haha.
Idle temps are good, what are your load temps? *Edit* saw 48deg in the OP*

How are you testing stability at the moment? *Edit* saw P95 in the OP*

And no, you will not hit 4ghz with your cooler. Not a chance if you're putting 1.45v for 3.4ghz ...

Follow my advice above - you could hit 3.6+ghz, and your NB will likely hit at least 2500mhz ... but your MB might hold you back for now.

I also noticed a user above state you don't have VRM cooling on your MB - not good. Don't take your voltage higher.

You might get a higher overclock at that voltage still by overclocking FSB way instead, and will get better NB overclocks probably, but you do not want to push a board like that too far, especially with a triple core unlocked to a quad core, which jumps from 95watt draw (plus overclock) to 130watt draw (plus overclock).

You WILL fry your board if you're not careful ...
Edited by willibj - 1/7/11 at 12:45pm
post #8 of 34
OP - just checked out your motherboard on newegg - I don't recommend overclocking AT ALL when looking at that board haha, it's terribly featureless for overclockers, and you really do run the risk of frying things ...
post #9 of 34
Quote:
Originally Posted by willibj View Post
OP - just checked out your motherboard on newegg - I don't recommend overclocking AT ALL when looking at that board haha, it's terribly featureless for overclockers, and you really do run the risk of frying things ...
I second this. down your clocks a bit to lower your voltage or put some serious fans on those mosfets or get an aftermarket mosfet heatsink.
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post #10 of 34
Quote:
Originally Posted by ckybam3 View Post
I second this. down your clocks a bit to lower your voltage or put some serious fans on those mosfets or get an aftermarket mosfet heatsink.
Even that might not be enough.

Frankly OP, your other components aren't terrible and you should REALLY look into getting a new motherboard if you intend to either unlock OR overclock your CPU.

Both together is a recipe for disaster on that board - it only has 4-pin CPU power input (not 8pin like most 140watt quad-core ready boards) and has ZERO cooling features for components.

Running it, even as you are now, with the added voltage is already playing with fire - that might be a literal pun too; motherboards have actually caught fire from over-volting the mosfets, taking out other components with them.

BE VERY CAREFUL, and seriously consider going back to a tri-core without any (or at least a big) overclock.

That is my final piece of advice for now ...
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