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FX-8120 @ 4.5 GHZ - stable but stuttering?

Last response: in Overclocking
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January 24, 2013 5:15:45 AM

System spec:

AMD FX-8120 8-core 3.1 GHZ @ 4.5 GHZ
G.Skill 8GB DDR 3 1600 MHZ Ram
Corsair H100 watercooler
ASUS HD7850 2GB DDR5 Direct CU graphics card
ASUS M578l-M USB 3 motherboard
700W lite-on power supply
x7 120mm case fans
Windows 7 64 bit

Problem:

I am currently experiencing issues getting my system smooth on 4.5 GHZ, I have tuned my bios
settings to be stable on prime at 4.5 GHZ but am having issues during 3D mark 11 benchmark tests. During the "physics"
test it will every 10 seconds slow down then return to normal. This also happens when playing CS - GO and other games.

When clocking back down to 4.2 GHZ it is stable and runs smooth during benchmarks and gaming.

I have turned off all the things in the bios that I should and have tried to adjust LLC (load line calibration). Have also tried under clocking/overclocking ram, ht link speeds ND voltage etc etc.

It just doesn't work!.

My power-supply is 700W but its cheap. I also have a very cheap mother board.

If anyone can help it would be greatly appreciated.

Regards,
Rod
a b à CPUs
January 24, 2013 5:36:13 AM

Could be your powersupply. What is its current voltage?
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January 24, 2013 6:31:08 AM

Hi thanks for the reply,

1.53v @ 4.5 ghz, (minimum for stability)

1.39v @ 4.2 ghz stable and smooth.

As for temps,:

4.2 = - 38-50c,

4.5 = 45-54

Heres a thought...

The Voltage drops from 1.53 to 1.14 when loading on prime is this normal?
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a b à CPUs
January 24, 2013 8:08:29 AM

not all cpu's are guaranteed to reach high overclocks it is probably hitting the wall over 4.2 so it all the luck of the draw :) 
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January 24, 2013 8:13:48 AM

hmmn.. many people sit on 4.5k all day.... they can be pushed past 5.0 ghz

Would abetter quality power supply effect it?
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a b à CPUs
January 24, 2013 8:22:15 AM

yes but overclocking is not a guarantee to reach a high overclock two identical cpus one could get 4.8 and the other might only go to 4.3 its all about luck and so many variables. you could get a quality psu but its a chance you would take and is it worth it for 300 mhz
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January 24, 2013 8:45:54 AM

its an addiction... I must sit on 4.5! lol

A quality PSU and performance motherboard wont effect my OC?
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a b à CPUs
January 24, 2013 8:54:03 AM

if you but a new motherboard and psu will you be pleased with yourself if you reach 4.5ghz and will you be pleased at what it has cost you to get it if you think about it you could have just purchased a FX8350 instead to save the trouble
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a b à CPUs
January 24, 2013 9:45:37 AM

Im Pretty sure its that motherboard man. However why dont you stay at 4.2-4.3 thats a decent oc and its stable you said
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a b à CPUs
a b K Overclocking
January 24, 2013 10:15:48 AM

This topic has been moved from the section CPU & Components to section Overclocking by Mousemonkey
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a c 79 à CPUs
January 24, 2013 10:19:06 AM

rodney007 said:
its an addiction... I must sit on 4.5! lol


Very pure statement :) 

That is a native AM3 mobo I think. I am not sure and may stand corrected. but I know one thing clearly and it is that AM3+ socket is designed for higher peak currents 145 Amps (I think) while AM3 can provide 110 Amps.

This difference does affect OC ceiling. an upgrade to 990 FX chipset might be a good option.

good luck
-satyam

p.s a quality psu like a 750 W corsair will be a great option as well./ but I am honestly not familiar with your current psu brand and its quality.
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a b à CPUs
a b K Overclocking
January 24, 2013 9:30:05 PM

It sounds like you might be throttling, you should try to monitor the temp + CPU-Z on another monitor during these situations and see what's happening with your clock speed.
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a c 1003 à CPUs
a c 392 K Overclocking
January 24, 2013 9:57:20 PM

Same here mine kept freezing at 4.6ghz but is fast and stable at 4.2.
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January 25, 2013 12:40:56 AM

dannoddd said:
It sounds like you might be throttling, you should try to monitor the temp + CPU-Z on another monitor during these situations and see what's happening with your clock speed.



Hi, Temps i go up and down every 6-7 seconds - from 48 to 53ish and then again over and over in prime under load.
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a c 1003 à CPUs
a c 392 K Overclocking
January 25, 2013 2:46:26 PM

Hi, Temps i go up and down every 6-7 seconds - from 48 to 53ish < not much of a variation
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January 26, 2013 3:25:22 AM

After bios and gfx updates i got 7037 points on 3d mark 11.

Updates said to add stability but still no luck at 4.5.

In fact if i go above 4.2 my score (physics) goes down. Seems to be my sweet
spot?
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a c 1003 à CPUs
a c 392 K Overclocking
January 26, 2013 11:05:05 AM

I agree 4.2 is perfect for my system also!
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June 26, 2013 3:05:55 PM

my fx 8120 will sit on 4.4 happy but if i take it to 4.5 it just crashs
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a b à CPUs
a b K Overclocking
June 26, 2013 6:04:45 PM

That motherboard has 4 phase power with no heatsinks. I'm actually surprised you haven't popped a MOSFET already. Time for an upgrade. 970 ud3 would serve you well
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August 23, 2013 7:19:52 PM

8120 @4.5ghz 1.4625V NB VID 1.300 Stable on Small FFT 24 hours. Blend crashes after 15 min
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