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AMD Kaveri A10-7850K Overclock Guide - Page 47

post #461 of 1332
Progress:
iGPU 1028MHz, 1.28125V - stable on anything I tested
NB 2000MHz, voltage 1.28125V (+1 step)
RAM 2400MHz, 1.670V (memtest86 2-pass stable) 9-11-11-29-1T-300 (2133 XMP timings, except 31->29 and tRFC 350->300) still lowering timings and testing.
APU PCIE VDDP 1.068V (+1)

Questions:
LLC does not seem to work at all on any setting? Constant droop of 0.025V+ (stock 1.325V->1.294V). Help?
When and why should I use CPU Voltage offset?
I am custom looped. VRMs get hot as summer in hell. Should I go for the 40 euro koolance mosfet waterblock? What about the chokes?
Quote:
Originally Posted by Spectrum Legacy View Post

APU PCIE VDDP is really new value for me. Is it possible that my issues with 2400mhz ram (especially when trying to increase iGPU frequency) might be because of that low setting? If it really handles IMC, it could perhaps help to stabilize things. I've read somewhere that on Richlands the high values were past 1.3V for VDDP, so in comparison the auto/default value of 1.052V seems too low. I'm just curious how too high or too low voltage affects the whole thing.

Any advice about VDDP voltage and what are the safe values for it or how to utilize it for the greater good would be appreciated. Thanks!
For me anything other than 3D was stable for 2400MHz ram. 3D BSOD, etc. even on stock iGPU MHz.
NB 2000MHz +1 step (1.28125V) AND APU VDDP +1 step (1.068V) did the job great. No BSOD, no lockups.

Tried playing with BCLK. NB DOES NOT POST at 2020MHz (101MHz BCLK). It's like some one just crippled it on purpose. mad.gif
I hate that person in particular.
Lowered the NB multi to 9x. Enters desktop up to 111MHz. SPI 1M instant not exact in round @ 101MHz BCLK, big ass LMAO. NOTHING could get ram stable at 2424MHz - 13-13-13-46-2T-350 1.75V (madness I know) did nothing! Again - someone purposely broke the IMC at 2400MHz. mad.gif
I hate that person in particular too.

So I got frustrated and bored and started upping the CPU, from AMD Overdrive, lol. 42x was rock stable with above settings and stock volts. Got even more bored and fired Assassin's Creed (first game, lol, nostalgia). Played for 4hrs. No problems there. Will go for max OC/UV.

Final target:
1. Max CPU rock stable. Max validation CPU. What's the safe VID for watercooled Kaveri? I'm thinking 1.500V for max stable OC, and 1.550 for validation? ATM it's doing 10C/20C idle/load delta Tcpu-Tair with 2 120mm 800rpm fans on the 320 radiator. Can go 5-8C lower if I throw in the third fan and max them at 1900rpm.
2. 24/7 - about 4GHz, maximum UV, maxed memory, iGPU, NB. Should be plenty horsepower for Farmville. biggrin.gif
post #462 of 1332
Quote:
Originally Posted by Abyssmal View Post

Final target:
2. 24/7 - about 4GHz, maximum UV, maxed memory, iGPU, NB. Should be plenty horsepower for Farmville. biggrin.gif

That's mine goal as well, having 24/7 rock-solid build that wouldn't smell of frying silicone in the summer.

I have no idea whether oc-ing by changing voltage manualy, or by doing it via offset has any advantages or is different in the end. Maybe someone with more experience could tell...
Meanwhile I set BCLK to auto and the difference is that it can finetune itself much closer to the real 100mhz compared to manual mode, which works in 1mhz increments on my board.

Today I spent by running Prime95 and fun fact was it always failed very early, until I increased APU PCIE VDDP voltage to 1.160V, at which point it stabilized during 2hour blending test. So my conclusion is, that default voltages and min/max values vary way too much even when bios resets to default. I've read quite some about VDDP today and it seems that safe values are up to 1.25V easily (for benching peopel ran it at 1.3V, but I have no idea what were the gains). Now I wonder if I increase it to 1.20 ~ 1.22V, whether I might lower voltage on dram from 1.70V to the rated 1.65V, or even tweak timings, since I use timings of 2666mhz profile except for frequency of course.

About LLC, I tried cpu LLC at 60% and 40% (40% on ASRock corresponds to high60% settings on Asus I think) as 100% is regular/default and 0% is uber-extreme on ASRock apparently. Vdroop is there just like yours: at 3.7ghz 1.325V VID and 40%LLC it reads 1.296V to 1.304V under full load. Turbocore is off, amp off, spectrum spread off, c6 auto (enabled I believe), CnQ dissabled, smv & iommu dissabled (though it had no effect I think), thermal throttle at auto. Also cpu is set to internal offset voltage control to complement c6, instead of fixed power mode. NB was at that time at 1.3V, NB-LLC auto, 1800mhz, 1.16V VDDP at 720mhz stable in 3D as well.


Try running Prime95 to see how it behaves, if not good, try increasing slowly VDDP. Though most important could have been that additional fan blowing on VRMs, since now after hour stresstest I can touch it and its warm, but not piping hot as it was before. Will have to find some permanent cooling option for vrm most likely as well (fan from kaveris stock heatsink is blowing at it from the bottom now, it works but howls). May the progress be good thumb.gif

EDIT: Tried to lower DRAM to 1.68V along 1.16V VDDP and failed during first minute of Prime95 twice. Lowered it to 1.65V and upped VDDP to 1.206V, it runs solid 1hour prime and now 1hour full aida system stability test with gpu stressing too. In that time, it surged only twice above throttle-mode of 3ghz/1.063V, if it is relevant at all. I will test a bit more and tomorrow will focus on NB/iGPU.

Conclusion: APU PCIE VDDP has effect on RAM stability, since at "stock" value of 1.058V I couldn't even boot up 2400mhz xmp profile at rated 1.65V.
Edited by Spectrum Legacy - 3/24/14 at 3:18pm
post #463 of 1332
Does anyone know what the APU PCIE VDDP is for? I've never touched it at all.
My system is actually acting VERY strange, RAM 2400Mhz 10-12-12-31, CPU 4Ghz with 1.30625V, GPU 900Mhz with NB 1.30625V, NB 2000Mhz.
If the computer starts off solid, it stays rock solid forever basically (sometimes a game crashes and I have to restart it, unsure if thermal issue).
However, if I restart my computer, 90% of the time it's very unstable. Programs start crashing (DWM, windows gadgets) and trying to start games causes crashes or bluescreen. Then I just have to restart repeatedly, usually about ~10 times before it gets stable again.
Changing things in the BIOS doesn't seem to do much help, and I can just restarted repeatedly without even entering BIOS until it becomes stable again.
Don't know if anyone knows what the problem here is. And just reading through the previous posts, some say the CPU VID voltage is 1.325V, which may be why I have the problem? But then again, my computer is rock solid once in while after reboots at 1.3062V.
post #464 of 1332
I got my cpu up to 4.5ghz stable, but i have to set my voltage in bios to 1.55. I get a reading from cpuz on 1.504v, is it normal that setting it in bios and expect voltage to be 0.046v lower?
DannyDK
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DannyDK
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post #465 of 1332
I have noticed a variable voltage, too. I think it is the nature of the beast. I read somewhere that the new HSA allows for dips in voltage, then when necessary will bump the voltage to max.
post #466 of 1332
Quote:
Originally Posted by wrtIAp View Post

Does anyone know what the APU PCIE VDDP is for? I've never touched it at all.

Your system is not stable.Test ibt, linx, prime95, memtest, heaven, valley.
Quote:
Originally Posted by Spectrum Legacy View Post

Conclusion: APU PCIE VDDP has effect on RAM stability, since at "stock" value of 1.058V I couldn't even boot up 2400mhz xmp profile at rated 1.65V.
Wow that's quite a bump in voltages. Too much?

I tried upping the bclk again to no avail. So timings it is.
9-10-10-29-1T-160 tRFC rock stable memtest with all other settings from last post. But 3D needed 1.680V on ram to stop crashing/bsod/lockup/restart. Damn Heaven!
Ram is cold as a b*tch, so no probkem there.

What is the safe ram voltage for 24/7?
Need help getting bclk 103-105.

Sent from my C5303 using Tapatalk
post #467 of 1332
Quote:
Originally Posted by Abyssmal View Post

Wow that's quite a bump in voltages. Too much?

What is the safe ram voltage for 24/7?

Need help getting bclk 103-105.

Yes it might seem as huge bump of 0.15V on VDDA, but I suspect that default 1.052V is a mistake in the first place. When I used latest F-stream version (non-beta), VDDA kept reading 1.2V regardless of what I put in bios. After installing beta version of F-stream, I got same reading as set in bios, 1.052V. Seeing as default values vary between MB brands as much as different bios versions, I tried to go that way and increase it in 0.05V steps, where I settled on 1.20V stable with fully working xmp and rated dram voltage (which was my goal).
So it is my speculation that 1.20V is safe value and possibly could even corresponds to APU 1.2V PCIE voltage setting on ASUS (again a possibility of different brands naming same thing differently). Also in another forum, someone is running kaveri as high as 1.3V VDDA, though I doubt its 24/7 value. APU PCIE VDDA voltage should feed the pcie controller in the apu itself - so it should be considered an internal circuit of apu. How exactly if affects dram and what else that internal circuit controls, I don't know but it obviously helped me stabilize xmp 2400 profile at rated 1.65V without getting errors in Prime.

About DRAM voltage, rule of thumb seems to be rated voltage +0.1V tops. Though I personaly try to be always a little bit more on the safe side, so for 24/7 I wouldn't go past 1.7V (since I was at 1.7V already with not completely stable in Prime, I went with VDDA bump instead) . Important to note is that each chip brand behaves and likes different settings e.g. Hynix, Samsung, Psc... There are claims of running Hynix 24/7 at 1.85V on air, but that is just extreme case and serious overkill imo.

I would go for tighter timings myself too, since I'm little bit dissapointed with 24x bclk being the ceiling, despite in description of ASRock it says 2600+ for my board. I so wanted to unleash those rated 2666mhz sticks! But I won't touch BCLK now because it hits the wall early with AHCI setups anyway (chances are you can't go past 103+ bclk on ahci, but you might try and test ide setup which should pass 103-105 wall easily. I would test it on stock cpu/gpu clocks first and loose dram timings though - at least I bump frequency first and then tighten timings if desired), and I don't see the point in using IDE with SSDs. Anyway ASRock, where is my 26x multi?! tongue.gif How about bios update after 2.5 months?!
post #468 of 1332
Quote:
Originally Posted by Abyssmal View Post


Your system is not stable.Test ibt, linx, prime95, memtest, heaven, valley.
Thanks for your reply! I ran Valley and prime95 for a while and everything seems to be running perfectly, though I don't know what tests I can get to load both CPU+GPU at the same time.
And when running on 4GHz full CPU load, my CPU voltage was only 1.256V, it does seem to be a bit lower than others', but it was perfectly stable throughout. Does anyone else get a similar voltage or is it just me?
post #469 of 1332
Quote:
Originally Posted by wrtIAp View Post

Thanks for your reply! I ran Valley and prime95 for a while and everything seems to be running perfectly, though I don't know what tests I can get to load both CPU+GPU at the same time.
And when running on 4GHz full CPU load, my CPU voltage was only 1.256V, it does seem to be a bit lower than others', but it was perfectly stable throughout. Does anyone else get a similar voltage or is it just me?
IMO you don't need to stress CPU+GPU at the same time. For me memtest86, hci memtest, ibt, linx, prime95, superpi 32m are ALL stable OC on 2400MHz 9-10-10-29-1T-160, 1.650V ram.

BUT 3D, eg, furmark, 3dmark vantage, heaven, valley crash almost instant. So upped the ram volts to 1.680V and it's 3D stable.

I cannot get even 101 BCLK on any voltage on APU, NB or RAM! Flood of errors in memtest86. frown.gif
Edited by Abyssmal - 3/26/14 at 11:27am
post #470 of 1332
Stock VID is 1.325v @ 3.7Ghz with Turbo boosting above that even. CPU-Z indicated as high as 1.38v under load. I've been running a manual 4.0Ghz, no Turbo, on only 1.25v without problems. Due to the 3Ghz throttling under iGPU load the CPU overclock isn't worth the extra heat/juice IMO. I get better benchmark scores using 4.0Ghz/1.25v than I do with stock Auto/Turbo mode on, which definitely seems to point to it being a TDP throttle.

Abyssmal, setting Bclk to even 101 on mine also results in a no-post. I tried changing to IDE but that didn't help. Voltage adjustments don't seem to help. Hoping an eventual BIOS update will address, am using latest beta version.

Danny a drop from 1.55 to 1.50 seems a lot of Vdroop. Look for a LLC setting in your BIOS and increase. That should get your load volts closer to your specified setting.
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