(Computer won't turn on) / How to overclock A10-7850K's memory controller

[Slobodan-888]

Memory controller in AMD A10-7850K only supports up to 2133 MHz RAM (stock). I have RAM that is factory guaranteed to work at 2400 MHz. In order to utilise its full potential (I use integrated GPU) I need to overclock memory controller.

How can I do that? I can't find any option for thin in a BIOS (latest version).

My motherboard is Gigabyte GA-F2A88XM-D3H

And if I would to contact a manufacturer, should I contact AMD or Gigabyte about this?

 

[truegenius]

post cpuz memory and spd screen shot so that we can have a look at the settings of memory and northbridge and get an idea on how to resolve this issue

also post the screen shot of memory settings of bios when you try to run it at 2400mhz and when you run it at 2133mhz

 

[cdrkf]

As I said, it has nothing to do with RAM. It is Kingston HyperX Beast 2400 (2 x 4 GB). It is factory guaranteed/tested to work at 2400MHz and CL11-13-14 with 1,65V.

http://www.kingston.com/datasheets/HX324C11T3K2_8.pdf

Overclocking is always tricky and you have no guarantees whatsoever. Your RAM kit may well be 'guaranteed' to run at 2400 mhz, however the IMC on Kaveri categorically isn't You may also find your motherboard is the problem- oveclocking is a black art!

With respect to performance of the APU, going from 2133 to 2400 will make virtually no difference to performance. There are lots of reviews of Kaveri performance vs ram speed and the boost diminishes each time you step up, the sweet spot is 1866 mhz, with a *very small* boost when going to 2133. I really don't think it's worth the hassle and remember if you start upping voltage you may well damage either the CPU, the IMC, motherboard or the memory modules and you won't be covered by warranty.

 

[Slobodan-888]

2133 MHz:

2400 MHz:

And this, if needed:

 

[Slobodan-888]

As I said, it has nothing to do with RAM. It is Kingston HyperX Beast 2400 (2 x 4 GB). It is factory guaranteed/tested to work at 2400MHz and CL11-13-14 with 1,65V.

http://www.kingston.com/datasheets/HX324C11T3K2_8.pdf

Overclocking is always tricky and you have no guarantees whatsoever. Your RAM kit may well be 'guaranteed' to run at 2400 mhz, however the IMC on Kaveri categorically isn't You may also find your motherboard is the problem- oveclocking is a black art!

With respect to performance of the APU, going from 2133 to 2400 will make virtually no difference to performance. There are lots of reviews of Kaveri performance vs ram speed and the boost diminishes each time you step up, the sweet spot is 1866 mhz, with a *very small* boost when going to 2133. I really don't think it's worth the hassle and remember if you start upping voltage you may well damage either the CPU, the IMC, motherboard or the memory modules and you won't be covered by warranty.

Yes, yes. And I have seen memory scaling tests on Kaveri and difference between 2133 and 2400 MHz is not negligible.

 

[cdrkf]

As I said, it has nothing to do with RAM. It is Kingston HyperX Beast 2400 (2 x 4 GB). It is factory guaranteed/tested to work at 2400MHz and CL11-13-14 with 1,65V.

http://www.kingston.com/datasheets/HX324C11T3K2_8.pdf

Overclocking is always tricky and you have no guarantees whatsoever. Your RAM kit may well be 'guaranteed' to run at 2400 mhz, however the IMC on Kaveri categorically isn't You may also find your motherboard is the problem- oveclocking is a black art!

With respect to performance of the APU, going from 2133 to 2400 will make virtually no difference to performance. There are lots of reviews of Kaveri performance vs ram speed and the boost diminishes each time you step up, the sweet spot is 1866 mhz, with a *very small* boost when going to 2133. I really don't think it's worth the hassle and remember if you start upping voltage you may well damage either the CPU, the IMC, motherboard or the memory modules and you won't be covered by warranty.

Yes, yes. And I have seen memory scaling tests on Kaveri and difference between 2133 and 2400 MHz is not negligible.

http://www.eteknix.com/memory-scaling-amd-kaveri-a10-7850k-apu/7/

To quote from that page:
"In gaming was where the real wins came. Across the board we observed significant jumps in frame rates of 10-30% in most games. The biggest jumps occurred between 1866 and 2133, there was a case of diminishing returns after 2133MHz."

You are chasing a 2 to 3 fps gain, and the key thing here is that in *none* of those benchmarks does the performance gain make the difference between the game being playable or not, or allow the game to be playable at a higher resolution. All games were playable on 2133 at 720p, a few were playable at 1080p, the same goes for 2400. I can understand you wanting to get the full potential out of your system, I'm just pointing out that the gains we are talking are probably not worth risking your system over so I'd highly recommend you avoid significantly changing voltages. If you can get it running stable by adjusting the memory timings that is fairly safe.

 

[truegenius]

try to set 2400 mhz ram ( ram timings to auto ) and use only 1 memory stick that too in slot 1

btw i will need memory tab screen shot too ( in previous cpuz pics )

 

[Slobodan-888]

RAM is not faulty. When I bought it, I received a faulty one. Only one of two RAM sticks could run at 2400 MHz, while other could not (I could boot into OS with one, but not with the other). I have returned that one and got a new one. And I have tried them both at 2400 MHz and I can boot into OS (and after few seconds or minutes blue screen). But that is due to memory controller.

Now, since I updated BIOS to the latest version, it will not even boot into OS at 2400 MHz. I can now only enter BIOS.

Here is a screenshot on memory tab (although I don't know why you need it, there is much more information on the BIOS screenshots):

@cdrkf

Sir, the issue is not whether it is viable to use it at 2400MHz or not. The issue is something else, so if you please leave that.

 

[truegenius]

this helped me to understand the scenario more
according to manual of your board, whenever you install 2 rams then and want to use dual channel then you should populate slot1 and slot2 first for optimum performance, but in bios screenshot, it showed that you used 3, 4 slots

thus try them in slot 1, 2 this time and see if it solves the issue

 

[Slobodan-888]

I use those slots because of CPU cooler. I will try to install them there.

 

[Slobodan-888]

OK, it fits fine in those slots. I have then set the X.M.P. to 2400 MHz. And computer starts to boot OS but at the very end (just before loading OS completely) I get blue screen.

What else should I change? Northbridge (frequency/ voltage, by how much)? RAM voltage (it is on auto, so it should be 1.65 V)?

P.S. Here is the dump file:

https://www.dropbox.com/s/abnedzsr8wd652p/082214-21294-01.dmp

 

[truegenius]

what error code you saw ? ( i down't use debugging tools thus can't even open your memory dump file )

 

[Slobodan-888]

I don't know. Didn't pay any attention. (It is "Computer has recovered from an unexpected something...")

 

[LucoTF]

http://www.overclock.net/a/common-bsod-error-code-list-for-overclocking

 

[Slobodan-888]

I mean. It is because of RAM frequency. That is way it blue screened. And memory controller is the culprit. And to repeat:

What else should I change? Northbridge (frequency/ voltage, by how much)? RAM voltage (it is on auto, so it should be 1.65 V)?

Should I repeat the blue screen just to see the error code?

 

[truegenius]

yes, repeat it and use the list provided by LucoTF above to see which thing need to increase or decrease

btw, northbridge is memory controller, thus if you want to overclock memory controller then overclock north bridge as far as you can without increasing voltage by much ( never increase more than +0.075v of northbridge)

i didn't tested apus thus i can't tell much on how to do that

 

[Slobodan-888]

Here it is:

0x0000007E

Additional information about the problem:

BCCode: 1000007e
BCP1: FFFFFFFFC000001D
BCP2: FFFFF88004A3C79E
BCP3: FFFFF880037B6118
BCP4: FFFFF880037B5970
OS Version: 6_1_7601
Service Pack: 1_0
Product: 256_1

 

[Slobodan-888]

yes, repeat it and use the list provided by LucoTF above to see which thing need to increase or decrease

btw, northbridge is memory controller, thus if you want to overclock memory controller then overclock north bridge as far as you can without increasing voltage by much ( never increase more than +0.075v of northbridge)

i didn't tested apus thus i can't tell much on how to do that

If you would please read this topic to see what have I tried so far.

 

[truegenius]

0x7e this didn't lead us to anywhere, it just said that bad overclock

try manually setting ram's timing and clock speed and voltage ( first select 2400mhz speed then set timing to auto then set it to manual ( this way auto settings will set its timings for 2400 and we will fine tune it ) and then set 11,14,14,30,54,2t,1.7v )

though i think they again provided you faulty ram
if you don't think that ram is faulty then you should try them on other systems too to make sure its ram or not

 

[Slobodan-888]

I don't know what 2t is (what to change to 2, Command Rate (tCMD))?

 

[truegenius]

yes, it is command rate, some times it can provide much stability

 

[Slobodan-888]

OK, I have set it manually to this:

http://www.dodaj.rs/f/29/i8/uwPtA21/24001.jpg
http://www.dodaj.rs/f/I/2A/1HPQZRXW/2400-2.jpg

and changed what you said. I will try.

 

[Slobodan-888]

With this settings, OS has booted. What program to use to check stability? I have SiSoftware Sandra and AMD overdrive already installed.

I will test it in a game, and later try to decrease the voltage.

 

[Slobodan-888]

It seems stable. But timing are now too loose. Which one should I try decreasing and by how much?

I have decreased voltage to 1,65 V.

Although, it seems strange to me that it works without overclocking IMC/NB. I mean, is IMC even utilising this 2400 MHz potential?

And thanks for the help, BTW.

 

[Slobodan-888]

I just got this message during gaming:

Game have not crashed, just minimized.

Never happened before, so it has to do something with RAM OC.

Edit: OK, game crashed now. What should I do?

 

[truegenius]

in the pics above, i see that you used 11,13,13,1t instead of 11,14,14,2t which is what cpuz stated for xmp2 that is 2400mhz

this must be causing instability

try 11,14,14,2t timings and then see if its stable