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[OFFICIAL] FX-8320/FX-8350 Vishera Owners Club - Page 481

post #4801 of 67358


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post #4802 of 67358
hello I recently bought an 8350 and was looking to o/c it to 5 gig stable for gamining just wonder if that is something that can be done or something close. I am novice at this and I am wanting to learn
post #4803 of 67358
Quote:
Originally Posted by flyin15sec View Post

Regarding Prime95
I just want to chime in on the Prime95 debate. First, I'm not in favor of Prime95 or not, I typically use multiple stress tests to achieve my own "Stable" settings. While trying to see how far I could go with my stock VID of 1.35v, I let Prime95 run, while I peruse the forums. I saw someone mention in this thread, what was some of the differences between the tests.
Well, I'm not a code monkey, not a software engineer. However, I did find something interesting which might help dispell why Prime95 is failing while the other stress tests aren't.
Prime has always had 3 primary tests, Small FTT, Large FTT and Blend. Small utilizes almost no memory to stress the CPU, Large will use more memory, Blend is a combination of tests between the two.
Back in the Core2 days, I learn that you could be Prime95 SFTT stable, but would still fail immediately with Blend or LFTT. This is because the other two tests stress your memory and memory controller.

TESTING Methodology:

I use CPUID's Hardware Monitor to record my findings. In my chart below, I ran 4 Prime95 tests, at 4.8ghz and 4.0ghz. I also ran IBT to show the differences. The voltage that we are looking at is CPU/NB. This voltage is a good illustrator to show the difference between Prime95 and IBT. Each tests took at least 3 mins. or more. I also had to change the CPU/NB voltage from 1.3v to Auto in the BIOS.
Legend:
Top Graph - 4.8ghz
Bottom Graph - 4.0ghz
Value - CPU/NB voltage of when I took my screenshot
Min - Minimum CPU/NB voltage registered
Max - Maximum CPU/NB voltage recorded

You can see that at 4ghz, there was almost no voltage variations between all 4 tests.
At 4.8ghz, you can clearly see that Prime95 LFTT test has a much higher recorded max voltage. This means that at one point it took 1.29v to maintain the test, while all the other tests took no more than 1.277v.
It's almost a certainty that this would explain why Prime95 along with IBT or any Linpack testing will fail at the same voltages at the lower overclocks. Once you get to the higher overclocks, Prime95 will need more voltage than IBT.
Keep in mind this is just CPU/NB voltage, There may be a variety of other voltages that requires this higher voltage for Prime95 that is not monitor by any software available.

So what you're saying in a nutshell, is that as you overclock the bus/multi, you need to overvolt the CPU/NB?
post #4804 of 67358
Hey guys.

I have a huge problem, and I have no idea, what happened.

My machine:

AMD FX-8320@4,6 GHz
ASUS M5A99FX PRO 2.0.
Corsair Vengeance 2x8GB 1600 MHz CL10 (it's sux, I know)
XFX Core PRO650W
MSI Radeon HD7870
NZXT Havik 140 cooler CPU.

After many hardships, finally reached a stable clock speed of the processor - 4,6 GHz with 1,464V, and I can't reach more. When I set the voltage to 1.55V CPU to 4.7 GHz clock remains unstable. In 3D Mark 11, CPU Physics test works completely wrong, and I have 11-12 FPS. On the same test, with 4,6 GHz, all just pretty clear and smooth - 24-25 FPS. Looks like, in 4,7 GHz, works half of the cores.

But this is little thing, I have biggest problem with my graphic card. On the motherboard M5A99FX PRO 2.0, I can't set more then 1000 MHz on my core, and 1350 MHz with memories, coz my system is completely unstable, and freeze after few minutes. What happened?

I try all methods, set my PCIE speed to 130 MHz (stock = 100) and used my processor at default settings, but if my core on the graphic card set to 1010 MHz and more, all system is not stable. With that MSI, default clock is 1050/1200. I'm heartbroken, because the card must go in the lower settings all the time,

Anyone have any idea?

Sorry for my english, I'm learning all the time.
post #4805 of 67358
Well, traded int the 8320 for a 8350. At least this one can get a stable 4 GHz clock for sure :-) (unless it's defective..) Will play with it more tonight but for now, I'm in the 8350 club.

From what I've seen, stock volts are at 1.375 and CPU-NB at 1.1875 I think. Batch is 1242.
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post #4806 of 67358
Quote:
Originally Posted by Maciomaniak View Post

Hey guys.

I have a huge problem, and I have no idea, what happened.

My machine:

AMD FX-8320@4,6 GHz
ASUS M5A99FX PRO 2.0.
Corsair Vengeance 2x8GB 1600 MHz CL10 (it's sux, I know)
XFX Core PRO650W
MSI Radeon HD7870
NZXT Havik 140 cooler CPU.

[...]
Indeed. My Kingston ValueRam (which actually has SERIOUS chips that are pure badass, takes 1.72v without a sneeze) limits my Phenom II as well. Past FSB285 **** just goes awry, snafu, and [insert weirdo acronym here]. About that half core fps thingy, i'd say throttle or bad bidding. my Phenom II (1055T, stock 2.8GHz) stops being efficiently OC'ing at 3.8, anything above 3.7 gets slower on ram timing, boots is less quick, takes volts to go to 4.0. past 4.1 it's ridiculously hungry). I'd say no need to push it past 4.6 if it doesn't work for you. In theory, anything above the boost speed on all cores is extra. anything under is defect.
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post #4807 of 67358
Quote:
Originally Posted by m0bius View Post

So what you're saying in a nutshell, is that as you overclock the bus/multi, you need to overvolt the CPU/NB?

He could be on to something here. I raised my cpu/nb volts just a little and prime has gone further than ever before. Currently going to be playing around some this afternoon.

As far as im concerned my pc is stable for what i need, and stable with IBT and OCCT but just to have that one last program say it is would be icing on the cake biggrin.gif
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post #4808 of 67358
Quote:
Originally Posted by Sazz View Post

which program did you use to check NB voltage? I use HWmonitor, if NB voltage is shown in HWM which one is it?

CPU/NB which is the memory controller:


Quote:
Originally Posted by m0bius View Post

So what you're saying in a nutshell, is that as you overclock the bus/multi, you need to overvolt the CPU/NB?

Not necessarily. How a person overclocks is base on their own setup. I merely wanted to show that there is a difference when using Prime95 and IBT. Prime95 will stress somethings more than IBT will, in this case it's CPU/NB with the Large FTT test.
Edited by flyin15sec - 12/3/12 at 4:36am
post #4809 of 67358
Any thoughts about asrock fatal1ty 990fx pro? im planning to replace my fail asrock 970 extreme 3? and if its not good, can you suggest a good replacement that is in its price range?
post #4810 of 67358
Quote:
Originally Posted by flyin15sec View Post

CPU/NB which is the memory controller:

Not necessarily. How a person overclocks is base on their own setup. I merely wanted to show that there is a difference when using Prime95 and IBT. Prime95 will stress somethings more than IBT will, in this case it's CPU/NB with the Large FTT test.

Well after nearly a few hours testing with different vcore and cpu/nb volts i have found no evidence in increasing cpu/nb helps at all. What i have found is what someone else posted earlier and to get prime stable it just takes upping vcore a significant amount to be stable on that one program. I left cpu/nb at 1.175(stock for me) and increased it to 1.3. Left at auto doesnt seem to change for me lol

This i tried on 4.8ghz multi oc and 4.8 bus oc and 4.6 multi overclock and a 4.6 bus overclock.
Edited by gertruude - 12/3/12 at 5:41am
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