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Need help OCing with AMD A8-3870K + ASRock A75M-ITX

post #1 of 25
Thread Starter 
Just finished building this thing a few days ago, and wanted to OC before I posted pics of the install.. (which installation went nearly perfect)

I have experience OCing with the Socket A's and which Multiply x the FSB and it gives you the overall clocked (and PCI Bus is locked) and then you just adjust voltages accordingly.

I built and OCed a AM3 system for my sister and it was the same formula.. except there was a North Bridge Frequency right? Which for her motherboard was around 2000Mhz, so after overclocking, I had to throw on a divider to get somewhere in-between stock NB clock frequency.


SOOOOOO now fast forward 2 more years, and I just recently built myself a FM1 socket system. So it looks like its roughly the same... but.. whenever I move the clock speeds just a BIT, it seems to fail windows load.. However when i OC using the manufacture software (not bios) it seems to work.. but ends up being unstable and crashing (with software overclocking i can change from the stock 3.0Ghz to up to 3.7Ghz)

However when i use the bios to overclock.. it seems so unstable i can't even get windows 7 to load up.

Here pictures of my bios screen.. not sure if there are other options to use to overclocking, I have the most up-to-date drivers from ASRock (it came like that stock.. i never flashed the bios before)
http://i17.photobucket.com/albums/b55/jannleesmustang/A75M-ITX%2004042012/IMG_0650.jpg

now heres the tab i changed from auto to manual to set cpu voltages and multiplyer.. also it has the NB frequency and volts.. from my assumption.. i thought I all had to worry about was CPU multiplyer and voltages... the rest I could leave stock.. am I wrong here? the NB Frequencies tab allows me to change it from 228Mhz-900Mhz.. I have no clue what the stock settings are because I don't see it in the CPU-Z like I did with the AM3 system I built... but when I drop the tab down it is defaulted at 720Mhz.. so Iam guessing its stock at 720?
http://i17.photobucket.com/albums/b55/jannleesmustang/A75M-ITX%2004042012/IMG_0652.jpg

my real concerned is about the NB frequency.. because i don't see it ANYWHERE on the CPU-Z like I did when i OCed the AM3.... are these NB frequencies locked now or something? or do I still need to worry about setting this when I overclock?? Because I don't see it anywhere in the CPU-Z to even know if it has gone up when I change the frequencies.. heres my CPU-Z:
http://i17.photobucket.com/albums/b55/jannleesmustang/A75M-ITX%2004042012/CPUZstockCPU.jpg

Anyways.. i consider my attempts at overclocking so far a disaster! I would be happy if I could just OC it a little bit from stock.. 3.0Ghz.. I would be happy if I could hit 3.2Ghz+ I was really hoping to see 3.5Ghz or 3.9Ghz reading from reviews and other members and reviews from retailing online stores.. but it looks like I can't even get past 3.1Ghz...
post #2 of 25
Llano does not have north bridge. North bridge has been integrated into the APU.

http://www.corsair.com/blog/amd_llano_oc/

And buy some VRM heatsink. That ITX board does not have heatsink on its power phases, so I would put some to cool it.
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Misaka
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Windows 7 Professional x64 (Host) Crunchbang Linux x64 (Guest) HP 2311x HP PS/2 Keyboard 
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post #3 of 25

These ITX boards are not built for overclocking.  You're limited to a very cramped 3+1 phase setup with only a single transistor and transistor-driver per phase (weak capacity) and that is not going to very reliably push a 3870k setup.  I recommend nay to any overvolting.  Ensure the VRMs are cooled no matter what.

post #4 of 25
Thread Starter 
but according to the pics i am doing the right thing right? just keep the NB settings on 720Mhz, and just change CPU voltages and multiplier?... it looks like i can do an extra 100mhz... there has to be some way i can get more and be stable haha.
post #5 of 25

Don't change the CPU voltages (not higher at least).

post #6 of 25
Thread Starter 
wow.. i didn't even realize i couldn't even play games stably at stock settings.. i have no clue what to do to prevent the PC from crashing!!!

all settings on are on complete default and the PC crashes within 1-60 minutes of game play on almost any game I play... i need help!!! i can't figure out if its the CPU or the Motherboard.

EDIT:

yeah I THINK its stable with all default settings with the fans set on FULL BLAST.... but it would STILL freeze/lock up occationally.. the screen wold just go BLACK.. or if iam lucky it would show a blue screen.. saying stuff like "Processing yada yada yada... if this is the first time this has occured then ignore it.. yada yada yada"

umm CPU alone it seems to be stable on Prime95. ran it for like 6 hours and it looks normal.. it only freezes after a bit of videogame play.. so i think its videocard related.. but its an APU.. sooo... GPU related.. would adding heatsinks even help with anything? there is definitly an improvement when i jack up the fans.. i wish there was a way i could downclock it below stock... but this motherboard only allows clocks of stock and higher for the GPU... so i feel like iam a bit screwed.. iam thinking about buying a videocard or something right now... but i bought this system to use its GPU on the processor.

so i was thinking about buying these? and throwing them on those little chip things on the motherboard:
http://www.newegg.com/Product/Product.aspx?Item=N82E16835708011

heres my motherboard:
http://www.asrock.com/mb/overview.asp?Model=A75M-ITX

where exactly do i need to put the heatsinks on?
Edited by Vash the Stampede - 4/8/12 at 10:28am
post #7 of 25
Thread Starter 
Ok.. looks like it was really just the heat.. and i can't beat it with this mini-itx build.

the CPU itself can take 70C+ temps without a problem doing prime 95 like a champ without locking up.. BUT the GPU part of the APU can only handle like 40-50C.... which is really limiting..

I actually had to DOWN CLOCK the CPU so that the volts would be low enough to control with the fans. So with the fans turned up AND being downclocked, I can use the GPU... at stock speeds, because the temps are controllable.. and i can get it steady under 50C.

This maybe one of the worst purchases I have ever bought.. I am glad its all over with and I can finally play games stable now and figured out the real problem was heat..

This is making me wanna buy a separate discrete videocard and just forget about the APU and just use the CPU part of the APU... but then i would have wasted my money getting the APU in the first place..

so right now to actually take advantage of my purchase I am actually running at 2.5Ghz. I bet if there was a way i could lower clocks of the GPU, i wouldn't need to do this, but this motherboards lowest setting for the GPU clock is the DEFAULT settings, you can only go up from there and not LOWER...
post #8 of 25
Hi, could you finally solve your problem?

I have almost the same config (A75M-ITX + A8-3850), and the same problem. At first, with a little OC, video signal went black after some minutes of gaming or GPU stress programs, though with CPU stress programs was stable, but now it do the same even at stock speeds....

But the problem is not the APU, I had another motherboard (Biostar A55MH) and it works fine (I only tried stock because it hasn't any OC option in the BIOS), neither the temperatures, mine only reachs 43°C at full stress with a CM GeminiiS.

The problem is the motherboard VRMs. They get very hot and Asrock motherboards has a protection which turn off the VRM to prevent damage. But I don't know why this happens at stock setting when it supports 100w APUs.

I'm thinking of making a heatsink for them, but if the problem is VRMs can't provide enough power, it will be the same.
    
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post #9 of 25
Quote:
Originally Posted by Vash the Stampede View Post

Just finished building this thing a few days ago, and wanted to OC before I posted pics of the install.. (which installation went nearly perfect)
I have experience OCing with the Socket A's and which Multiply x the FSB and it gives you the overall clocked (and PCI Bus is locked) and then you just adjust voltages accordingly.
I built and OCed a AM3 system for my sister and it was the same formula.. except there was a North Bridge Frequency right? Which for her motherboard was around 2000Mhz, so after overclocking, I had to throw on a divider to get somewhere in-between stock NB clock frequency.
SOOOOOO now fast forward 2 more years, and I just recently built myself a FM1 socket system. So it looks like its roughly the same... but.. whenever I move the clock speeds just a BIT, it seems to fail windows load.. However when i OC using the manufacture software (not bios) it seems to work.. but ends up being unstable and crashing (with software overclocking i can change from the stock 3.0Ghz to up to 3.7Ghz)
However when i use the bios to overclock.. it seems so unstable i can't even get windows 7 to load up.
Here pictures of my bios screen.. not sure if there are other options to use to overclocking, I have the most up-to-date drivers from ASRock (it came like that stock.. i never flashed the bios before)
http://i17.photobucket.com/albums/b55/jannleesmustang/A75M-ITX%2004042012/IMG_0650.jpg
now heres the tab i changed from auto to manual to set cpu voltages and multiplyer.. also it has the NB frequency and volts.. from my assumption.. i thought I all had to worry about was CPU multiplyer and voltages... the rest I could leave stock.. am I wrong here? the NB Frequencies tab allows me to change it from 228Mhz-900Mhz.. I have no clue what the stock settings are because I don't see it in the CPU-Z like I did with the AM3 system I built... but when I drop the tab down it is defaulted at 720Mhz.. so Iam guessing its stock at 720?
http://i17.photobucket.com/albums/b55/jannleesmustang/A75M-ITX%2004042012/IMG_0652.jpg
my real concerned is about the NB frequency.. because i don't see it ANYWHERE on the CPU-Z like I did when i OCed the AM3.... are these NB frequencies locked now or something? or do I still need to worry about setting this when I overclock?? Because I don't see it anywhere in the CPU-Z to even know if it has gone up when I change the frequencies.. heres my CPU-Z:
http://i17.photobucket.com/albums/b55/jannleesmustang/A75M-ITX%2004042012/CPUZstockCPU.jpg
Anyways.. i consider my attempts at overclocking so far a disaster! I would be happy if I could just OC it a little bit from stock.. 3.0Ghz.. I would be happy if I could hit 3.2Ghz+ I was really hoping to see 3.5Ghz or 3.9Ghz reading from reviews and other members and reviews from retailing online stores.. but it looks like I can't even get past 3.1Ghz...

I have same board, same issues. But i got a 3850 so little more tricky.

Yes, the asrock extreme tuning seems to make "something" stable.

The NB defaults to different settings depending on your ram settings. For 1866 it defaults to 720/1.2v, which is too low/high for this.
900mhz and 1.15+v should get you a good starting point. Should work good with the K as you don't have to use base overclocking.
Run as little volts with that board as possible. I'm folding at 3.559ghz (123 baseclock) at 1.39-1.4v but it just blacksreens with prime95 at the same settings. This is also getting warm for my low profile cooler, with core temps at 48-50c, and socket in the 55ish range. Running lower frequencies can easily get less volts, and should make the screen dropping out go away. See how low volts you can get it stable @ stock, then work your way up the multi. You should be able to get to at least 34x wihout having the blackscreen issue. I have axtu open on startup/auto apply, but going up in baseclock you have to turn off auto apply if you don't want it to run some questionable overclock. its happened to me.
3dmark11 shows nb issues along with ram issues. I take it those are set properly though?
post #10 of 25
Quote:
Originally Posted by TinoArg View Post

Hi, could you finally solve your problem?
I have almost the same config (A75M-ITX + A8-3850), and the same problem. At first, with a little OC, video signal went black after some minutes of gaming or GPU stress programs, though with CPU stress programs was stable, but now it do the same even at stock speeds....
But the problem is not the APU, I had another motherboard (Biostar A55MH) and it works fine (I only tried stock because it hasn't any OC option in the BIOS), neither the temperatures, mine only reachs 43°C at full stress with a CM GeminiiS.
The problem is the motherboard VRMs. They get very hot and Asrock motherboards has a protection which turn off the VRM to prevent damage. But I don't know why this happens at stock setting when it supports 100w APUs.
I'm thinking of making a heatsink for them, but if the problem is VRMs can't provide enough power, it will be the same.

It's because llano's have the volts set too high from factory/taking cpu off auto. 1.4v is high. @ 2.9/3.0, 1.2v should even be stable for most. SO much less load on the chip/vrms. Switching away from down-blowing coolers would compound the issue.
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