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not holding max CPU speed.

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  • Stress Test
  • Speed
  • CPUs
Last response: in CPUs
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April 19, 2014 7:26:51 PM

I overclocked my CPU to 3.8ghz and thought I would stress test. I overclocked using these instructions considering I don't know much about over clocking.

AMD FX-6300 overclock settings on stock cooler @ …: http://youtu.be/MsOCEeJ5ZYQ

I used prime95 to stress test and noticed my CPU cores was not holding the max clock speed. They bounced from max of 3.8ghz down to 3.2ghz. I thought the CPU should stay maxed out during this test?

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a c 144 à CPUs
April 19, 2014 7:36:03 PM

It could be throttling. What motherboard, PSU and cooler?
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April 19, 2014 7:57:07 PM

Asus m5A97 r2.0. PSU is a prudent way 550watt.
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April 19, 2014 8:11:25 PM

Another thing is, with this overclock method it causes my ram to be overclocked to 1736mhz when stock is 1600mhz. Could this be causing an issue
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April 19, 2014 8:41:02 PM

Also had hardware monitor running in background while gaming. According to it.. Min 12 volt was 11.6volt and min CPU vcore was 0.876v . Am I having PSU issues?
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a c 144 à CPUs
April 19, 2014 9:06:44 PM

I've never heard of that PSU could you link me to the model?
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April 19, 2014 9:22:18 PM

This is the PSU they gave me at local computer parts store. Told them whati wanted to build and this is the psu they included. I'm also running a fx6300 CPU, r9 270x , 8gb of 1600mhz ram, two 120mm and one 140mm case fans plus 100mm CPU heatsink fan. HDD and DVD drive
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a b à CPUs
April 19, 2014 9:33:39 PM

FSB (front side buss) is what he refers to. That is usually 800MHz. Your CPU uses that at a particular multiplier. So does the RAM. He changed the FSB from 200 to 217, changing the RAM speed, aswell as the cpu speed. If your RAM is already at max stable speed of 1600, 1736 will most likely be unstable. Best bet is to leave FSB at 200 and just to raise the CPU multiplier under the turbo settings. This will allow the CPU to run at lower clock speeds when not needed, and ramp up to OC speeds when CPU usage is needed, without affecting other components like RAM etc.

Word of caution. OC with a stock cooler is never recommended, stock coolers are designed to cool a CPU at stock speeds, and that's about it. To really OC a 6300, you need a CPU cooler capable of cooling potential greater than the 95w of your CPU. CM Hyper212 Plus or EVO is capable of 180w cooling capacity, which is more than enough to see your 6300 up to 4.4-4.5GHz, or 1.216v I believe it to be.

I'm sorry, but your psu is the next best thing to a boat anchor. Max output on each rail is 18A, 430w max, so continuous is more like 360-370w @12v+. The 3.3 and 5v are huge @ 34 and 36A. Considering the price of the unit, the only way to make a profit would be to use uber-cheap components and under cut every quality corner possible. It's not even capable of meeting 80+ efficiency standards. It's no wonder you are seeing 11.6v readings.

As far as the throttling, likely that was caused by over heating the CPU, which will try and throttle back at first to cut voltage (higher voltage=higher heat) and failing that will just shut down.
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April 19, 2014 9:40:53 PM

Thanks for input on overclocked method. I'll change that. Yeah I was worried about the powers supply. Saw it on list of PSU to avoid somewhere on the net. I keep a good eye on CPU temps. I haven't ever been in too high of a team zone so far. I have a everCool buffalo heat pipe cooler for CPU. Idles at 30c and never gets over 50c range when gaming.
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a b à CPUs
April 19, 2014 10:00:33 PM

Well gaming uses very little CPU for the most part, if you kept the hwmonitor logs, I'd look at those to see what max temps were, as prime95 will definitely stress a cpu to 100%, especially small fft.
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April 19, 2014 11:41:40 PM

Temps have been fine under all conditions. Did prime 95 the other night for 30min and I think temps was 48c. I'm just wondering about my voltage. I set ram back to stock 1600 and overclocked with just the multiplier. Now I have a 3.9ghz. Speed and 4.3ghz turbo
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April 20, 2014 8:51:33 AM

Karadjgne said:
FSB (front side buss) is what he refers to. That is usually 800MHz. Your CPU uses that at a particular multiplier. So does the RAM. He changed the FSB from 200 to 217, changing the RAM speed, aswell as the cpu speed. If your RAM is already at max stable speed of 1600, 1736 will most likely be unstable. Best bet is to leave FSB at 200 and just to raise the CPU multiplier under the turbo settings. This will allow the CPU to run at lower clock speeds when not needed, and ramp up to OC speeds when CPU usage is needed, without affecting other components like RAM etc.

Word of caution. OC with a stock cooler is never recommended, stock coolers are designed to cool a CPU at stock speeds, and that's about it. To really OC a 6300, you need a CPU cooler capable of cooling potential greater than the 95w of your CPU. CM Hyper212 Plus or EVO is capable of 180w cooling capacity, which is more than enough to see your 6300 up to 4.4-4.5GHz, or 1.216v I believe it to be.

I'm sorry, but your psu is the next best thing to a boat anchor. Max output on each rail is 18A, 430w max, so continuous is more like 360-370w @12v+. The 3.3 and 5v are huge @ 34 and 36A. Considering the price of the unit, the only way to make a profit would be to use uber-cheap components and under cut every quality corner possible. It's not even capable of meeting 80+ efficiency standards. It's no wonder you are seeing 11.6v readings.

As far as the throttling, likely that was caused by over heating the CPU, which will try and throttle back at first to cut voltage (higher voltage=higher heat) and failing that will just shut down.


I've still been keeping an eye on voltages while under load. checking HWmonitor after playing bf4 this morning showed a min on 12v to be 11.7v. The 5v min was 4.9v and the 3.3v min was 3.1v. My temps aren't an issue , at least I don't think. not using stock cpu cooler, have a evercool buffalo cooler. not the best but works much better than the amd one that came with cpu. so are these signs that the crappy brand psu just isn't up to powering my setup?
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a b à CPUs
April 20, 2014 8:58:47 AM

What was max vcore when running 3.8? If it wasn't temps, then your CPU could have been starved for voltage. Should have been @ 1.1ish
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April 20, 2014 9:01:07 AM

I'll check right after im done with this match of titanfall.lol
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April 20, 2014 9:39:49 AM

Max vcore 1.356v
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a c 144 à CPUs
April 20, 2014 10:30:44 AM



Yikes, that PSU is insanely bad aweful not even single rail. If you care about your rig, give that thing to your worst enemy.

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a b à CPUs
April 20, 2014 2:04:17 PM

Ok, youd have to ask someone more experienced than me for verification, but I think that's a little high for 3.8 OC
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April 20, 2014 3:41:55 PM

Karadjgne said:
What was max vcore when running 3.8? If it wasn't temps, then your CPU could have been starved for voltage. Should have been @ 1.1ish


damric said:
said:


Yikes, that PSU is insanely bad aweful not even single rail. If you care about your rig, give that thing to your worst enemy.

[/quotems

lol yeah starting to get the picture that the psu is garbage. I know very little about them. figured they gave me a good one for what i wanted to build..Guess not. after looking around the net i see that its not a quality psu. guess it will be next upgrade. single rail better than dual rail and if so why?
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a c 144 à CPUs
April 20, 2014 4:43:56 PM

Generally go for single rail, especially on low to medium wattage PSUs. High wattage multi-rail is fine if you really know what you are doing and set up each rail's load correctly. There are plenty of good PSUs out there, but there are way more junk PSUs. Just beware, and be sure to ask around about a specific PSU before you make your next purchase.
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April 20, 2014 7:52:02 PM

Recommendation on a inexpensive yet quality PSU? One of 600watt and good amperage.
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a b à CPUs
April 20, 2014 8:15:31 PM

Antec 620w semi-modular High Current Gamer. Normally @ $80 but quite often on sale @ $50-$60. Made by Seasonic, its the best there is at a great price.
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April 20, 2014 10:55:31 PM

that PSU needs to be changed ASAP. if voltages are under by that much you might be causing serious damage to the PC. it may not be the problem but its def contributing. get a 650w good brand or an 800w cheap one
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April 21, 2014 6:31:16 PM

I've already taken the PSU out. Better safe than sorry. Store said they would give me store credit towards another PSU. Think I'll get a seasonic 700+watt they have.
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a b à CPUs
April 21, 2014 8:55:01 PM

nice of them, that's great!
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April 22, 2014 6:12:47 PM

The store gave me a store credit towards another PSU. I picked up a seasonic G series 750watt. Voltage stays above 12 volt now. According to core temp, max CPU speed is still going up and down when running prime 95. Could this be because of my overclock settings?
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a c 144 à CPUs
April 22, 2014 6:28:02 PM

m5A97 r2.0 is not a good board for overclocking. It's probably overloading the VRMs forcing throttling.
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April 22, 2014 7:27:50 PM

Returned to stock clock speed and tested again. Still doesn't hold maximum CPU speed during test. Bounces. Back and forth from max to 3ghz.
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a b à CPUs
April 22, 2014 9:37:09 PM

The only thing left that I can think of is that you missed something in bios. I'd suggest reset to default, and test again. Just about everything should be on auto. With stable voltages, default bios, and acceptable temps there should be no reason not to maintain stock speeds.
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October 7, 2014 10:28:23 PM

I would be disabling all power saving options in the bios. CPU spread spectrum and a few other things I would be changing. I jsut cant remember the names. ill post back when i get into my bios

I have the same CPU. and I do notice when I run the stress tests. it jumps between the turbo and base clocks if I dont disable the turbo. is that what's happening? is it dropping below 3.5ghz? or is it going 4.1... down to 3.5 ?
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