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AMD Kaveri A10-7850K Overclock Guide - Page 48

post #471 of 1332
Is it because of my overclock that my first core sometimes run at 100% and the rest is idleling? (not running anything)
DannyDK
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post #472 of 1332
Can somebody tell me what settings or parameter changes after a reboot? I don't understand why my fully stable system will keep crashing after a reboot, and it takes 10s of reboots repeatedly to get it to boot stable again. So every time I have to leave my computer on 24/7 and sometimes it's a little inconvenient.
Thanks
post #473 of 1332
Quote:
Originally Posted by wrtIAp View Post

Can somebody tell me what settings or parameter changes after a reboot? I don't understand why my fully stable system will keep crashing after a reboot, and it takes 10s of reboots repeatedly to get it to boot stable again. So every time I have to leave my computer on 24/7 and sometimes it's a little inconvenient.
Thanks
That's really strange. After all those reboots what are your bios settings? Because if failed to boot some times in a row resets to default bios and boots. At least with Asrock Extreme4+. Try enetering bios when post is successful to check settings.

I have established that my iGPU is stable at 1110MHz (at least) set through AMD Overdrive. But cannot load windows if set from bios. Is there a workaroud? Seems driver issue. Using latest beta.

PS: Today I'll be playing with lower timings on that (Micron D9?) Corsair ram. What can I aim at? 9-9-9-27-1T-160? Lol, dreamy, huh!

Wish me luck.
post #474 of 1332
Quote:
Originally Posted by wrtIAp View Post

Can somebody tell me what settings or parameter changes after a reboot? I don't understand why my fully stable system will keep crashing after a reboot, and it takes 10s of reboots repeatedly to get it to boot stable again. So every time I have to leave my computer on 24/7 and sometimes it's a little inconvenient.
Thanks

Temperature changes during reboot for example. Have you checked how hot are your VRMs? Temp sensors themselves aren't always accurate, so ground yourself and touch that heatsink or use more accurate measuring device. Since your issue seems to be affected by reboot, its either temp or borderline voltage setting. If the latter, I would say too low APU PCIE VDDA, my all-time favourite scamp everyone ignores! biggrin.gif

To stress both cpu and gpu at the same time, you can use aida64 for example, or perhaps there are freewares out there doing the same thing. I would like to point out that stressing them both at the same time is relevant, if you plan to play games on iGPU. If it behaves well during combined stresstest, then it will be rock-solid with games too.

Vdroop of 0.05V seems to be common on 7850k with regular/dissabled LLC. Flat voltage vcore = cpuvid could be achieved by highest possible LLC I think, though I haven't tried it, as it would most likely put more stress/heat on VRM and that would be of more concern to me as of now. At 3.7Ghz and 1.300V CPUVID I get 1.272V to 1.280V actual vcore readings with 40% LLC during cpu-only load (haven't tried 20% very high and 0% extreme LLCs yet).
post #475 of 1332
Quote:
Originally Posted by Abyssmal View Post

That's really strange. After all those reboots what are your bios settings? Because if failed to boot some times in a row resets to default bios and boots. At least with Asrock Extreme4+. Try enetering bios when post is successful to check settings.

I have established that my iGPU is stable at 1110MHz (at least) set through AMD Overdrive. But cannot load windows if set from bios. Is there a workaroud? Seems driver issue. Using latest beta.

PS: Today I'll be playing with lower timings on that (Micron D9?) Corsair ram. What can I aim at? 9-9-9-27-1T-160? Lol, dreamy, huh!

Wish me luck.
Thanks for the reply, I can boot into windows basically everytime, but programs will start crashing and when running tests the program crashes or the whole computer crashes, and bios settings are the same every time. By the way, which version is the latest beta? There seems to be a couple versions that I can find on amd's site depending on where I search them from. I'm using the one that was released on Jan 14.
Quote:
Originally Posted by Spectrum Legacy View Post

Temperature changes during reboot for example. Have you checked how hot are your VRMs? Temp sensors themselves aren't always accurate, so ground yourself and touch that heatsink or use more accurate measuring device. Since your issue seems to be affected by reboot, its either temp or borderline voltage setting. If the latter, I would say too low APU PCIE VDDA, my all-time favourite scamp everyone ignores! biggrin.gif

To stress both cpu and gpu at the same time, you can use aida64 for example, or perhaps there are freewares out there doing the same thing. I would like to point out that stressing them both at the same time is relevant, if you plan to play games on iGPU. If it behaves well during combined stresstest, then it will be rock-solid with games too.

Vdroop of 0.05V seems to be common on 7850k with regular/dissabled LLC. Flat voltage vcore = cpuvid could be achieved by highest possible LLC I think, though I haven't tried it, as it would most likely put more stress/heat on VRM and that would be of more concern to me as of now. At 3.7Ghz and 1.300V CPUVID I get 1.272V to 1.280V actual vcore readings with 40% LLC during cpu-only load (haven't tried 20% very high and 0% extreme LLCs yet).
So what does the APU PCIE VDDP do actually? I've never changed it before. If it's related to the iGPU, does that mean I can lower the NB Voltage after upping the VDDP? My VRM's are actually quite cool, now that I've ripped off some of the stock cooler blades for the VRMs + the stock fan biggrin.gif, and they've run crazy hot before without causing the crashes I'm facing after reboots.
Btw, I am getting 1.256/1.272V for CPU when it's set to 1.30625V BIOS, so you're quite right about the 0.05V Vdroop.

Thanks everyone for the help so far, I didn't want to put more burden on this thread with my problems at first, but not being able to turn my computer on and be stable in 1 go is really starting to drive me crazy
post #476 of 1332
Quote:
Originally Posted by wrtIAp View Post

So what does the APU PCIE VDDP do actually? I've never changed it before. If it's related to the iGPU, does that mean I can lower the NB Voltage after upping the VDDP? My VRM's are actually quite cool, now that I've ripped off some of the stock cooler blades for the VRMs + the stock fan biggrin.gif, and they've run crazy hot before without causing the crashes I'm facing after reboots.
Btw, I am getting 1.256/1.272V for CPU when it's set to 1.30625V BIOS, so you're quite right about the 0.05V Vdroop.

Thanks everyone for the help so far, I didn't want to put more burden on this thread with my problems at first, but not being able to turn my computer on and be stable in 1 go is really starting to drive me crazy

No worries mate, it's in the name of progress! redface.gif About VRMs I did the same thing, put stock fan from 7850k heatsink under it to help with cooling, since rear-mounted radiator with push-pull fans obscure VRMs heatsink. That fan bitten me a moment ago again...nasty bugger!

APU PCIE VDDA (that's the name on ASRock at least) represents voltage that feeds the integrated pcie controller on apu. Now you might think it is of no use when you are not using dGPU or other cards on pcie lanes...but as far as I know, iGPU sits on some kind of internal pcie lane itself. I don't work for amd, so I might be as well wrong, but all the info I gathered points that way - if there is someone more educated in the matter, I would welcome additional info myself.. When there is some kind of ram or igpu instability (and lets face it, most instabilities on igpu here are caused by dram anyway, because even at idle 350mhz igpu clock it shares full dram clock speed/timings at all times), bumping apu pcie vdda should help. It allowed me to go back to stock 1.65V on dram. Whether it affects NB and IMC in some way, I don't know. What you could try is loading stock bios profile again, or lets say something conservative like 4ghz cpu, stock igpu, ram clock/timing you want to be using and then rising VDDA up slowly, by 0.025V increments or faster in 0.05V bumps. I'm still at 1.206V myself.

About drivers on fresh install I went to amd.com > drivers+support> drivers+download centre> filled in 7850k and chose beta (the lower driver - should be 14th jan iirc) and istalled everything except for Catalyst. After reboot, amd.com again > drivers+support > latest amd apu drivers for win7 64bit 14.3 beta, installed full package with Catalyst too now, except for that gaming software it comes with. If you are going to reinstall catalyst, its always good to first use clean uninstall utility from amd...I guess they know better why they are suggesting it that way.
post #477 of 1332
Quote:
Originally Posted by Abyssmal View Post

I have established that my iGPU is stable at 1110MHz (at least) set through AMD Overdrive. But cannot load windows if set from bios. Is there a workaroud? Seems driver issue. Using latest beta.

What is the NBVID voltage you use? At 1100+ mhz it has to be past 1.4V! I would be very careful with voltages around 1.4V, as that was highest safe value on 32nm A10s.

Tested 960mhz at iGPU, it bumped NBVID itself to 1.306V regardless of voltage I set in bios, while LLC had no visible effect at all (remember that we can't see actual VNB readings, so it most likely has effect on actual voltage). At 1028mhz it bumped NBVID further to 1.363V, all while F-stream kept reading original value I put in bios (1.2875V at that time). Only Aida64 registered that automatic bump in NBVID...that's why I'm curious what voltages you are getting.
post #478 of 1332
Hey guys,

I've been following this thread for some time, tried lots of things, but can't get a stable setup with 2400mHz RAM. I have a Gigabyte F2A88XN-WIFI running the f4b BIOS. Does anyone actually have a stable setup (in gaming appications) with this motherboard, or another Gigabyte model? If so, can you please post some info on your BIOS settings?

Just for added info, I'm able to run 2133 without a hitch, and even 2400 boots into Windows and operates fine in non-3d appications, however, games typically run for ~45s until they crash. I'm using Mushkin Blackline 2400 RAM rated CAS 11.

Any help is appreciated. I'm sorry if I've missed a post already dealing with this.
post #479 of 1332
Quote:
Originally Posted by Spectrum Legacy View Post

What is the NBVID voltage you use? At 1100+ mhz it has to be past 1.4V! I would be very careful with voltages around 1.4V, as that was highest safe value on 32nm A10s.

Uhm nothing of the kind - NBVID is a step up (needed for 2400MHz ram). It did 1060MHz iGPU on stock volts. Dunno, maybe lesser 7700K iGPU runs on lower volts at those MHz.

My Corsairs do not want lower timings than 9-10-10-29-1T-tRFC160 @ 2400MHz. Tryed up to 1.70V - no go. Same errors in memtest86. Haven't played with the secondary though.

(Greedy voice) Need.bandwidth.moar. biggrin.gif

I got bored on ram tweaking and went for CPU undervolt @ 4.3GHz. Did 10-pass Linx @ 1.28125V+0.012V+1/2CPU LLC - actual readings 1.262-1.266V on both idle/load. That's 0.030V lower than stock. Will try undervolting @ stock frequency.

(Greedy voice2) Need.volts.less. biggrin.gif
post #480 of 1332
Oh my bad Abyssmal, I thought you were using 7850k. From what I gather, 7700k behaves mucho-stablo:) Also you got really tight timings there, I can't go to 160 row freq cycle, otherwise its cmos reset button for me. 10 - 12 - 12 - 30 - 1T worked but with errors in prime after 15mins at 1.65V, so I'm back at stock xmp2 2400 11-13-13-30-1T again.

Have you tried to run some benches how your beastie performs (especially memory performance)? It would be interesting whether its viable to push those timings, or focus on something else instead to gain performance or trim thermals a bit. Anyway good job!

On iGPU I'm at 960mhz, 2000NB, 1.3125V 60% LLC (medium), 1.222V APU PCIE VDDA (1.206V started to crash under full system stresstest past 30min). However I consider my chip has sweetspot at 900mhz iGPU, 2400 ram, 2000 nb and possibly 3.7~4Ghz cpu, in terms of performance/thermal/power ratio for 24/7 use (C6+internal cpu offset definitely helps with power when idling the cores).
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