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hwmonitor shows fx6300 vcore fluctuations during prime95

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February 28, 2014 9:38:08 AM

as the title says - when i run prime95 my vcore voltage fluctuates constantly, the higher end is 1.440 and low end is 1.065 when i monitor it with hwmonitor.
sorry to ask i'm a really new to overclocking, but is this ok?
all i have done to OC my cpu is turn off cool n' quiet and up the mulitplier to now 20 to get 4ghz which i am happy enough with (for the moment, until i upgrade my cooling), and have been running prime95 blend test, last one was 3hrs. temperatures with stock cooling are not getting above 57c which i believe is more than safe i'm just wondering is the vcor voltage drop normal?
if not, and i need to remedy something i'll need an almost step-by-step guide on what to do in the BIOS
a b K Overclocking
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February 28, 2014 10:07:20 AM

joe90_remy700 said:
as the title says - when i run prime95 my vcore voltage fluctuates constantly, the higher end is 1.440 and low end is 1.065 when i monitor it with hwmonitor.
sorry to ask i'm a really new to overclocking, but is this ok?
all i have done to OC my cpu is turn off cool n' quiet and up the mulitplier to now 20 to get 4ghz which i am happy enough with (for the moment, until i upgrade my cooling), and have been running prime95 blend test, last one was 3hrs. temperatures with stock cooling are not getting above 57c which i believe is more than safe i'm just wondering is the vcor voltage drop normal?
if not, and i need to remedy something i'll need an almost step-by-step guide on what to do in the BIOS


mmmm... did you turn off c1 and c6?

it sounds like you have a great little chip, but i also have to wonder if you're not temp throttling. How hot does your cpu socket temp get on your motherboard (as a rule, never trust the reported core temps on an AMD cpu unless you can verify they're accurate with another temp from something else)

see piledriver when reporting temps correctly will often report temps on the cores almost 10C cooler then the cpu socket temp on your motherboard. At 72C on the cpu socket, your motherboard will throttle back the cpu, reducing heat and dropping the vcore. Your vcore voltages at 1.065 are too low to run prime at 4ghz, no matter how good a chip you have. That's a resting voltage or a throttled back voltage, or a power saving voltage. that's not a 6 core piledriver going full speed on a prime burn.

so as you can see it's not like anything wrong is happening, it's just we need to figure out exactly what is causing it. on one hand it might be a power saving mode... on the other a temp throttling feature (and if it is, you'll need a better cpu cooler then the stock one)

frankly i think it's a temp throttling feature, as the stock cooler is rarely good enough to run prime95 on a 6 or 8 core piledriver at stock settings.
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February 28, 2014 1:40:41 PM

my board is an asus m5a97 r2.0
if its this temp throtting you are saying then is it better to put it back to 3.5ghz? i dont have the money yet for a better cooler and the last thing i want to do is risk burning stuff out

and how would i go about checking these features are enabled/disabled in my bios? i wouldn't know where to start looking tbh for the c1 and c6 settings and i do not know what they even mean (see... total n00b, sorry) but i have seen somethin called energy saving somewhere in the cpu settings in bios i forget the letters something like epm
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February 28, 2014 2:07:44 PM

^^^ You asked for guides, I posted two of them for you, one that is specific to the Asus board that explain every settings and where they are, try reading them.
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February 28, 2014 10:05:01 PM

turn all the power saving features off so that your voltage doesn't dip down so low. when your fine tuning voltages and overclock settings you want to see the real voltages, not the power saving ones. once you find a stable overclock you can turn them back on and be fine. but for overclock tuning, they are annoying.
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a b K Overclocking
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March 1, 2014 1:43:47 AM

joe90_remy700 said:
my board is an asus m5a97 r2.0
if its this temp throtting you are saying then is it better to put it back to 3.5ghz? i dont have the money yet for a better cooler and the last thing i want to do is risk burning stuff out

and how would i go about checking these features are enabled/disabled in my bios? i wouldn't know where to start looking tbh for the c1 and c6 settings and i do not know what they even mean (see... total n00b, sorry) but i have seen somethin called energy saving somewhere in the cpu settings in bios i forget the letters something like epm


under advanced in or near the north-bridge or power settings tab you should find those power states.

I don't think changing it back to 3.5 will change anything. Simply put prime95 puts a tremendous amount of load on your cpu, and the stock AMD cooler isn't really up to keeping the cpu cool under that strain. I suspect the results would be the same either way.
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March 1, 2014 2:22:53 AM

ok thanks.
i actually got a bit of money in today, and have heard people go on about a hyper 212 evo - its not too expensive where i am actually - but i am wondering if it will fit
1) on my asus m5a97 r2.0 mobo
2) in my zalman z9plus case
3) over g.skill ripjaws (2 cards in the blue slots)

i would run dual fans if possible, doe it mount with the fan(s) blowing front to back (ie the grill verticle) or bottom to top?

cheers and sorry for going a bit off topic...
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a b K Overclocking
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March 1, 2014 7:31:30 AM

1) yes
2) yes
3) yes (you can clip the fans a little higher if you need to on the evo and not lose any performance to get over high profile ram)

4) generally you want the evo pointing front to back, it's one of the cpu coolers that actually works better that way (not all have a "preference")

~the evo is a nice cpu cooler and should be able to keep the cpu cool under an extended prime95 burn at stock or slightly overclocked settings (if that is your problem). Understand that the evo suffers from the same issue all heatsinks do when trying to cool piledrivers at higher overclocks. piledriver has rapid temp spikes, which really challenges heatsink/fan cpu coolers. At higher voltages and overclocks even the best air coolers stop being effective on a piledriver cpu. That said you probably won't be able to get beyond 4.4ghz-4.6ghz or so on an evo and a 6 cored piledriver
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March 1, 2014 1:53:06 PM

thats ok i'd be happy with a simple o/c around 4ghz for the moment - 4.4 would be great but a bit beyond me to get the settings right i think. maybe in the future!
is there another cooler in the same price region (30-40euro) that you think would be more effective?
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a b K Overclocking
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March 2, 2014 10:07:41 PM

joe90_remy700 said:
thats ok i'd be happy with a simple o/c around 4ghz for the moment - 4.4 would be great but a bit beyond me to get the settings right i think. maybe in the future!
is there another cooler in the same price region (30-40euro) that you think would be more effective?


not really... the hyper evo has earned it's reputation as a budget champ. usually you'll have to pay two to three times what the evo costs to see a significant improvement in performance.
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March 2, 2014 10:23:53 PM

in the usa, the phanteks $50 PH-TC12DX is noticeably better than the hyper 212 evo. after that you need to either step up to a $70ish noctua nh-d14 or the king of all air coolers which is the phanteks ph-tc14pe. after either rebaste or deal the phanteks is the same price as the noctua but is barely better at the same price and they jockey for position.
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March 4, 2014 2:54:17 PM

ok i have seen a good auction price on an as-new one of these: thermalright silver arrow sb-e
would it fit into my case/over my ram (i could swap the fans around so none are over my ram)
also seen a good price on this: Zalman CNPS10X Performa
i guess it would fit as its roughly the same dimensions as the 212 evo, but will it perform as good? i have heard that removing the speed-limiting resistor really boosts performance and it out-does the 212 evo... anyone with experience with both care to share?
thanks
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