Help for an OC noob

elementface

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Nov 11, 2013
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Hey guys,

Last year marked my entrance into PC gaming, and so far I'm loving it. Right now (as I'm typing this, in fact) I am currently OC-ing my CPU. I think I know what I'm doing, but I have some questions. I'm sorry if some of my questions are answered by other threads or resources, but the issue I'm having is some guides mention some things like they are essential to consider while other guides never mention them at all, as well as just completely conflicting information, even from reliable sources.

First off, my specs:
AMD Athlon x4 750k
Sapphire Radeon HD 7870
10G of DDR3 ram in 4 sticks, 3 different brands
ASRock FM2A75 Pro-4 M motherboard
High quality 500W PSU
Air heat sinking (Looking into water/liquid cooling soon; that's my next upgrade :) ) As I side note, I normally run my computer with the side panel off. I know it increases dust accumulation, but I am excellent at keeping my PC components clean and dust bunny free and I always have duster on hand. For me, it dramatically reduces my CPU temp - around 10c in most cases!
Also, I am a computer scientist so I am comfortable with any lingo you want to throw around.

Next, here is my OC-ing process:

Firstly, a program called ASRock eXtreme Tuner Utility came with my mobo (http://www.youtube.com/watch?v=_7naB8kIZXE). It's a windows program, like others of its kind, that allows for CPU/RAM tuning without needing a restart or interaction with BIOS. I've read up on the program and others that do a similar thing and I am very aware of certain concerns OC veterans have with regards to in-windows OC-ing. I personally am okay with BIOS and can use it if I feel like it's necessary, but I'm not looking to push more than 4.0Ghz or 4.5 at the very max.
That means I don't expect any instabilities to come out of anything except Vcore issues, so I don't need the level of control one gets from BIOS tweaking. Some specific issues I've read about AXTU are temperature readings not being accurate; I have other programs in place that have better credibility with these types of readings. I also like not having to constantly reboot, because repetitious rebooting can put stress on HDDs, especially the older ones I'm using. As for being able to turn off power saving features and other OC nuisances, all of those settings are also available within windows.

I am using CPUZ to monitor whether changes made in AXTU are actually reaching the hardware, as well as to monitor Vcore readings. AXTU also monitors Vcore, but since it has issues with temperature readings, I thought I should also keep an eye on this with another program as well. However unlike temperature readings which have conflicted, so far Vcore readings from AXTU and CPUZ have essentially been the same.

Next, I am using HWMonitor. I swear CPUID is going to own me within a month :p. This is obviously being used for temperature monitoring, as well as a third reference for Vcore readings.

To stress test, I am using Prime95.

I am also using task manager to keep a larger view on what's happening.

As for the actual process:
I started off at a multiplier of 36 (baseline for this CPU) with a Vcore of 1.35v (baseline for this CPU). I go into AXTU and bump up the multiplier by one and wait a minute or so as a "basic stability test." After making sure it's stable at low demand, I then pull up Prime95 and start a torture test. While testing, I watch the CPU temperature to make sure it does not exceed 70c and watch the Vcore to make sure it doesn't jump from 1.35 to 1.6. I let Prime95 go for 10 minutes or so, and then I restart the process.

Here are my questions:

1. Am I correct in believing I should stay away from temperatures exceeding 70c and Vcores exceeding 1.5v?

2. Am I correct in assuming I can knock around 7c off of any temperature readings I get from the CPU as a package? I have read online that although the CPU as a whole might be at something like 60c, the individual cores are actually running 5 to 10c cooler, and those are the specific components that can't overheat. Is this safe/validated?

3. Is this the correct order of troubleshooting for an unstable configuration? Revert last change -> Increase Vcore and retry, up to 1.5v -> if still unstable, check the RAM -> other issues.

4. Am I correct in assuming any temperature readings I get while using Prime95 are worst case and most situations, even gaming, will not cause the CPU to heat to maximum for more than a minute or some other negligible time frame?

5. Am I safe in trusting heat guarding features, or features that kill the computer if the CPU gets too hot? I've had this happen to me before and so far my CPU hasn't shown any signs of damage from that instance so I assume these features are effective.

6. If I get to a stable setting, but get into a game and the framerate stutters horribly, is it safe to assume it's likely an insufficient Vcore setting, and is it usually a lack of voltage that is the issue? Can too much voltage also cause this issue?

7. Will reducing the Vcore help reduce CPU heating?

8. In what situations would I want to consider messing with NB, SB or DRAM voltages? I know most people don't need to mess with these settings to OC, but some people have for reasons that I'm having a hard time finding online and these settings are available within AXTU. Is 1.1v for NB and SB standard, and is 1.5v for RAM standard like I am assuming? Also, when would I want to change the timings of my RAM? Right now it is at 9-9-9-24-33 @ 600mhz

9. What is the point of CPU voltage offsetting and in what situations would I want to use it? I believe it is essentially a power saving feature and I have disabled it because it was causing risky Vcore levels, but I'm still not entirely sure about that conclusion.

10. When would I want to mess with PCI frequencies? My CPU does not have integrated graphics, so adjusting APU frequencies are pointless, but PCI frequencies are available for changing in AXTU. Right now I'm keeping it at 100mhz


Thanks!
 
I guess I'll start at the top rather than dive into your specific questions right away.
First observation, if you are getting better temps with the side panel off, you need to address your case airflow. The addition of fans may be what is needed here since cases are (supposed to be) designed to maximize the cooling potential of the inside components by channeling airflow and keeping the airflow laminar (smooth) throughout.
On to your specific questions...
1) yes, as far as I could find, that CPU has a TJ Max of 70C so I'd put my stressing cap at about 60C and shut down the test if I hit 65C. The VCore is less important than the temp there although the two are very much inter-related
2) That one I'm not so sure about, the temp readings are an interpolation, IMO the best settings to use are "Distance to TJ Max" - doesn't help for bragging rights but is reported to be more accurate in all programs that have that feature
3) Correct? I don't know but that is what I do.
4) Yes, Prime95 (and other stressing programs) will put more stress on your system than typical gaming usage. In fact, barring usage like my systems endure, you shouldn't come close to the system demands of stressing programs.
5) I'm not so sure I would trust AMD's overheating safeguarding - I've had it kick in in the past but it literally took weeks for the thermal sensors to reset themselves (that was on a lappy, don't know how normal CPU's handle that)
6) If you are stable, it won't be a voltage issue that causes stuttering - likely heat or ram (to that end, I will really push to get a "kit" of ram which will help with dual channel operation - a feature I suspect you are running without right now)
7) Yes, see answer #1
8) Northbridge if ram or PCI cause blue screens, shouldn't be anything on the Southbridge to play with, DRAM only in as much as needed to get ram stable. I don't think I'd play with the ram settings too much while running mixed modules
9) Voltage offset is used to "tame" the automatic voltage regulation of the motherboard when in turbo or dynamic mode. When you increase the CPU's frequency, you need to increase VCore in order to compensate for higher switching frequencies of the processor core. The conventional method of doing this is simply to set voltage control to manual mode and type in the required voltage for stability at the selected operating frequency. The problem with that is that the voltage remains static under all loading conditions so you'll end up using more power even when idling so you'd use Offset Mode to help.
10) I haven't ever gotten into the need there, can't really comment
 

Danzas4321

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Jul 4, 2013
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Seeing as you have a 750k im going to direct you to this thread
http://www.overclock.net/t/1404334/amd-athlon-x2-340-370-and-athlon-x4-740-750k-760k-be-owners-club
I to have an Fm2 athlon mine being the 760K and have learned alot from this thread. sadly my board or my chip isnt the best so i can only muster 4.5Ghz @ 1.5v. people in this thread have these chips stable at upto 5.2ghz, so its definitely worth a read. All info about the CPu is found in first post including Temp max and highest voltages :) Hope i helped :D ALSO FOR CPU TEMPS DO NOT USING HWMONITOR. for these chips pretty much all programs are insanely Offset and much higher or lower than they are. You should use what came with your board to measure temps, GIGABYTE is easy tune6, ASUS is AI suite, MSi click bios and in your case is the ASROCK extreme tuning uitility. So yeah, that thread is definitely worth a read. Hope i helped :D
 

elementface

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Nov 11, 2013
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"First observation, if you are getting better temps with the side panel off, you need to address your case airflow"
I think the main reason my PC cools better with the panel off is because A) the CPU heatsink blows the hot air right into the panel, B) There is a giant graphics card blocking the flow of air from the PSU, which is working as an intake, to the fans on the top of the case which are working as the exhaust, as well as a mess of wires to the right preventing that flow from simply diverting around the card; the card nearly touches the panel C) The intake fan is on the same side as one of the two exhaust fans, so I think it's just sucking in some of the hot air that is being blown out.
In any case, the case SHOULD provide better heat control with air flow when it's closed, but ultimately it doesn't hurt the computer to have the panel off and if it works better, it works better. Perhaps when I upgrade to liquid cooling I'll consider another case for better flow.

In response to everything else:
2) I figured it was an interpolation, which I was afriad of. When it comes to something like this, I would figure hardware designers would opt for raw readings instead of interpolated. Regardless, do I want to look at the temp of the CPU itself or the CPU tin reading? I have a feeling HWMonitor is just guessing what the CPU actually is based on the tin reading
6) I am, luckily, running dual channel. So far my stuttering issues have been limited to either too much voltage or too little. However, when I get above 4.0Ghz I start to BSOD from the RAM apparently running to slow, or more specifically responding too slowly. Perhaps that is the current source of my limitation, but as it stands I'm happy with 4.0Ghz. But I will continue to try to push the OC safely because I'm still being bottlenecked by my CPU; I haven't even touched the GPU in terms of OC-ing.
8) If RAM is the source of crashes, would I want to opt for messing with the NB voltage first or the DRAM voltage? Although the RAM sticks are from different companies, I was smart enough to get sticks with the exact same specs except for capacity. They all have the same latency and frequency, so perhaps changing DRAM voltage is safer under those conditions?

 
First - back to the airflow thing - the PSU is always an exhaust, just adding that to keep in mind for airflow consideration. Unless someone physically turned the fan around, it's blowing out the back.

For 2), perhaps an infrared thermometer
I don't know what level of luck that is when all your mixed and matched ram play nice together but sure, if the only issues you've had have been voltage related, have at the timings and frequency, I'd work the DRAM voltage first
 

elementface

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Nov 11, 2013
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Just reviving this due to issues:

I've OCed to 4.0 but am experiencing stuttering. This did not happen the first few times I ran at 4.0, but now I can't get the stuttering to stop. I've tried increasing the vcore, but to no avail. I investigated the possibility of the CPU overheating, but it consistently stays in the 40c range. I've limited the ram to 2 sticks from the exact same company, but no improvement.

Any suggestions?
 
Can you describe the frequency of the stuttering? Does it last? Does it seem to increase and/or decrease with time
Would it be possible to post some CPU-Z and GPU-z screenshots? CPU-z mainboard and memory tabs, GPU-z just the sensor tab (after running for about five minutes)