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FX 8120 Overclocking help

post #1 of 15
Thread Starter 
Hi i'm new to overclocking.I've been trying to overclock my fx 8120 but i've hit a wall at 4.4 ghz.Its taking 1.47 volts to get it stable in prime 95 which is a bit much.I've been reading the fx owners thread and most people agree my chip should be having no problems overclocking because the VID I have is suppose to be really good for overclocking (My chip VID is 1.3375 v ).

At first I thought temps were the problem so I went out and got a h100 which did fix the tempature problem it allowed me to get past 4 ghz but I can't get stable past 4.4 ghz

When run prime 95 or use any program that puts a high load all the cores like video encoding I notice a huge voltage drop.My voltage goes from like 1.47 to like 1.39 then my pc blue screens shortly after starting the stress test.There is suppose to be a setting called load line calibration in the bios that helps stop the voltage drop but my motherboard does not have this setting and none of the bios updates have it either which is one of the reasons I suspect its my motherboard causing the problem

Here is the motherboard i'm using
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128519

I also think my power supply could be causing the voltage drop because it's not the greatest quality but I highly doubt this.However I would like to replace it if its going to cause damage to my to cpu parts or limit my overclock.

Heres what i'm using for a power supply
http://www.newegg.com/Product/Product.aspx?Item=N82E16817152036

So my question to you guys is there anything I can change to help fix the voltage drops?

If there is nothing I can change in my bios or in windows which part of my cpus should I upgrade and what should I buy?
Edited by Beat1188 - 2/5/12 at 4:37pm
post #2 of 15
Have they said anything to you about what option in the bios need to be turned off ? Something is making the voltage fluctuate like this. What changes have you made in the bios beyond just bumping the vcore and the multiplier ?

The board should be fine since it does have the proper phases and heatsinked VRM's.

The raidmax PSU is very iffy and trying to OC a 125w FX chip on that is testing it. It might not be holding its voltage when put under a load
Edited by hednik - 2/2/12 at 12:04pm
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post #3 of 15
Thread Starter 
So far i've disabled

AMD C1E support
AMD C6 support
Virtualiazation
Cool and Quiet
Core Performance Boost

Also what do you think about http://www.newegg.com/Product/Product.aspx?Item=N82E16817139010 as a replacement power supply?
Edited by Beat1188 - 2/2/12 at 6:02pm
post #4 of 15
Thats a good choice.........have one myself and performs well..thumb.gif
You can also disable LLC, that should help with the Vdroop...
Edited by Glyphor - 2/5/12 at 12:34pm
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post #5 of 15
Thread Starter 
Good to know I picked out a good power supply I plan on ordering it before the end of the week.

I am also thinking about getting http://www.newegg.com/Product/Product.aspx?Item=N82E16813131736 or http://www.newegg.com/Product/Product.aspx?Item=N82E16813131735 as a replacement motherboard if I can't push my overclock anymore with a new power supply.

There is no LLC option in my motherboards bios sadly which is one of the reasons I want to replace my motherboard.
post #6 of 15
The crosshair V is a great motherboard no problems getting to 5.1ghz(1.54v tongue.gif ) on it would be a good choice if you wanted a better mobo smile.gif
 
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post #7 of 15
+1 CHV Great OC mobo!!thumb.gif
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post #8 of 15
@beat1188
I'm having the exact same problem and supected it may be my power supply , but didn't want to accept it because I can't afford to get a new one right now. I've got an 8150 on an Asrock 890fx dx5 motherboard running with two 6870s in crossfire. I'm cooling with water, so my temperatures haven't really been a problem, staying below 50 unless I really crank the vcore. Even with the vcore at 1.525 I could only get up to about 4.5 or 4.6 stable. Using the multiplier vs. the HTT didn't have any effect either. I was thinking maybe my memory wasn't entirely stable, but it passed a full day of memtest, so it must be either the psu or the mobo.

Coincidentally, I too could only get an overclock of 4.4 ghz stable in prime95. I'm going to try taking out a video card and see if that helps with my overclock because I have literally messed with every bios setting countess times. I found that setting my LLC to 1/4 helped me at least get past 4.3 ghz and lower the vcore from about to 1.48 to a more comfortable 1.45 for 24/7 use. Under load I'm still getting a vdroop of about .05, which I think has something to do with my mobo. Disabling LLC or bumping it up to 1/2, as recommended in the BIOS for AM3+ chips, (the only other options) either eliminates the vdroop entirely, (but imagine causes a huge immeasurable voltage spike) or makes it even larger, pushing .1--both of which result in instablity and BSODs. For now I'm satisfied enough at 4.4ghz, but my goals i really to get as close to possible to 5.0 ghz at reasonably safe voltage for daily use. Did you ever end up ordering a new power supply or did ever try overclocking the chip with only one gpu? Have you found any other settings in the bios that help? I was thinking about trying to enable c1e in the bios in an attempt to get the vdroop under control, but doubt it will work. If anybody else had ideas please feel free to help me out.
Edited by zatza - 2/27/12 at 3:51pm
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post #9 of 15
Thread Starter 
I did try overclocking it with the new power supply but I was still having voltage drop issues.

After digging through a few threads I found that gigabyte 9xx boards did have voltage drop problems and I would have to get another revision of my current board to get LLC in my bios.So the problem prolly is your motherboard and not your PSU.

I ended up selling the chip to phillyd. I think he had more success with it than I did so I would ask him what he did.
post #10 of 15
A good PSU is very important when running the FX 8120, I fried my 600w Thermaltake PSU overclocking with it.. lol I now have a new Corsair 750w.
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