A10 7850K NB core voltage and frequency questions: 2/17 still need help

Akaelae

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Jul 26, 2014
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2/17/15 update
Additional edit: Just got a red screen of death, yes red. Scaling back NB core voltage to stocks, gonna see if that makes a difference.
Additional edit: Achieved stability by decreasing ram speed to 2133mhz with tightened timings.

I've ALMOST achieved a stable attempted overclock to 4.5Ghz with 1.475v hovering around stable with a 20 minute aida64 stress test around a mark of 51 degrees Celsius. Around 61 degrees when stress tested with Prime 95 before crashing after about 8 minutes of stress testing, prime 95 is more intensive I take it? Ideally I'd like to get a stable 4.5GHz on my cpu before I scale the ram frequency back and tighten my timings a bit.

I'm pretty sure I can dial down the voltages a bit buuuuut I've screwed with the NB Core voltage a bit and I've yet to successfully touch the north-bridge frequency without everything going to hell in a hand-basket. My NB frequency is defaulted at 1,800Mhz though I've heard the North-bridge needing to match the ram speed but I've also heard people getting away with 2100mhz nb frequency with 2,400Mhz oced ram with the A10 7850k. Is any of this true? Also is my NB core voltage fine, do I need to adjust any of these voltages?
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Also I'd appreciate it if nobody gave me shit for pairing an R9 290 with an APU, I got it cheap for $200 so it was kinda of an afterthought.

CPU: A10 7850K 4.2 GHz 1.4v
CPU cooling: Corsair H110
MOBO: Gigabyte GA-F2A88X-UP4 F6 bios updated
RAM: 16 Gb(2x8)Gskill sniper 2,400 MHz(OCed from a 1866Mhz version)11-13-13-31 1.65v (I input the timings from the 2,400MHz version off newegg)
GPU: R9 290 BF4 Edition stock clocks
GPU cooling: Corsair HG10 bracket paired with Corsair H90
Operating system: Windows 10 64 bit
SSD: 120 Gb Samsung SSD

 
Solution
"4.7GHz with 1.5v" is a perty high over clock. I would start at 1.35V and work my way up. As for how to overclocking I could not find a guide specifically for your board but the idea is Raise CPU Multiplier by 2, reboot see if Windows loads all the way and if not raise your voltage to see if it stabilizes enough to boot and keep doing this until you find the sweet spot which is were you don't need huge voltage gains to get tiny clock gains.

I would also monitor your Temps while doing this. You will need a temperature program and some kind of CPU stress tester to see what your max temps are under load.

This might help, not your CPU and Motherboard but the ideas are sound...

https://www.youtube.com/watch?v=bZPy6xMhtso

JimF_35

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"4.7GHz with 1.5v" is a perty high over clock. I would start at 1.35V and work my way up. As for how to overclocking I could not find a guide specifically for your board but the idea is Raise CPU Multiplier by 2, reboot see if Windows loads all the way and if not raise your voltage to see if it stabilizes enough to boot and keep doing this until you find the sweet spot which is were you don't need huge voltage gains to get tiny clock gains.

I would also monitor your Temps while doing this. You will need a temperature program and some kind of CPU stress tester to see what your max temps are under load.

This might help, not your CPU and Motherboard but the ideas are sound...

https://www.youtube.com/watch?v=bZPy6xMhtso
 
Solution

Akaelae

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Thanks this has given me a good starting point. I also figured out my RAM stability issues. I made a really green mistake by making the terrible assumption mixing different RAM kits from the same manufacturer and product line would be fine.

 

jammybstard

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What's your default voltage for the cpu? I have this same APU and it is stable at the default voltage at 4GHz I had to start rasing the voltage beyond there. I keep mine at 4.2GHz at +0.06v I'm sure it would go higher than that with your cooling.
 

Akaelae

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I have my cpu at 1.4v, default was around 1.25ish.