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

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  • Overclocking
  • Controller
  • RAM
  • CPUs
  • Memory
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a b à CPUs
August 10, 2014 7:13:15 AM

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?

More about : computer turn overclock a10 7850k memory controller

a b à CPUs
August 10, 2014 7:37:39 AM

Slobodan-888 said:
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?


Up the bus speed a few notches from 100 MHz till it shows your ram at 2400. You can't up the ram multiplier because you may overshoot 2400 by a wide margin. You then may have to drop the cpu multiplier as this will overclock your cpu also. Maybe not. You really have to look at the bios and study it. There are so many adjustments in these EUFI bios.
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a b à CPUs
August 10, 2014 9:12:21 AM

I don't think that is it. My BIOS has XMP (extreme memory profile) for 2400 MHz. I can even start OS with RAM on 2400MHz but after a few seconds I will get blue screen.
I need to overclock memory controller within the CPU. This is what don't know how to do.

Or is it that you are actually talking about?
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a b à CPUs
August 10, 2014 11:18:24 AM

Slobodan-888 said:
I don't think that is it. My BIOS has XMP (extreme memory profile) for 2400 MHz. I can even start OS with RAM on 2400MHz but after a few seconds I will get blue screen.
I need to overclock memory controller within the CPU. This is what don't know how to do.

Or is it that you are actually talking about?


There is a good chance you won't be able to run that memory at 2400. Is your ram voltage at 1.65? It should be.
The memory controller on the cpu is not anything you have access to.
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a b à CPUs
August 10, 2014 11:27:02 AM

As I said, it has nothing to do with RAM. RAM is fine, it is factory guaranteed to work at 2400MHz (it is advertised as 2400MHz, do you understand that?). I have tried increasing the RAM voltage, but RAM is not the issue, memory controller is. I know that people where able to use faster RAM than what it is guaranteed by the memory controller, by increasing the voltage of it (of the memory controller), and thus making it stable at higher frequencies.

So, if I can't overclock memory controller, how can I increase its voltage? Can't find that option in BIOS.
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a b à CPUs
August 10, 2014 11:35:35 AM

Slobodan-888 said:
As I said, it has nothing to do with RAM. RAM is fine, it is factory guaranteed to work at 2400MHz (it is advertised as 2400MHz, do you understand that?). I have tried increasing the RAM voltage, but RAM is not the issue, memory controller is. I know that people where able to use faster RAM than what it is guaranteed by the memory controller, by increasing the voltage of it (of the memory controller), and thus making it stable at higher frequencies.

So, if I can't overclock memory controller, how can I increase its voltage? Can't find that option in BIOS.


To increase any voltage in the bios you first have to change the voltage settings from auto to manual. Then the individual voltage settings menus become visible.
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a b à CPUs
August 10, 2014 11:43:54 AM

Sir, I am not mentally retarded. I said, there is no option to change the MC voltage in BIOS. It's not like it says "Memory controller core voltage - auto" and that I don't have mental capability to change "auto" to "manual"...

So, if there is no options in BIOS for it, does that mean that this motherboard does not support this and will never add this capability in the next versions of BIOS (because manufacturer wants me to buy higher-end MB that has this option)?

If so, should I contact Gigabyte about this? Or there is no point?

P.S. There is North Bridge core voltage option. I suppose that memory controller has nothing to do with NB (it is not powered from the same voltage line)?
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a b à CPUs
August 10, 2014 12:53:51 PM

Slobodan-888 said:
Sir, I am not mentally retarded. I said, there is no option to change the MC voltage in BIOS. It's not like it says "Memory controller core voltage - auto" and that I don't have mental capability to change "auto" to "manual"...

So, if there is no options in BIOS for it, does that mean that this motherboard does not support this and will never add this capability in the next versions of BIOS (because manufacturer wants me to buy higher-end MB that has this option)?

If so, should I contact Gigabyte about this? Or there is no point?



P.S. There is North Bridge core voltage option. I suppose that memory controller has nothing to do with NB (it is not powered from the same voltage line)?



Figure it out yourself then.

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a b à CPUs
August 11, 2014 12:17:18 AM

That is very helpful.
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a c 93 à CPUs
August 11, 2014 1:37:50 AM

Slobodan-888 said:
Sir, I am not mentally retarded. I said, there is no option to change the MC voltage in
P.S. There is North Bridge core voltage option. I suppose that memory controller has nothing to do with NB (it is not powered from the same voltage line)?


The north bridge function as the memory controller.
Basically you will need to go through north bridge to communicate with the main memory.

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a b à CPUs
August 11, 2014 6:18:36 AM

So should I then overclock NB and by how much? It is at 1800 MHz now. And what else should I do? Because this will affect other thing as well?
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a b à CPUs
August 11, 2014 6:55:01 AM

I have tried this:

RAM: XMP-1 (2400 MHz)
NB: 2200 MHz
Vnb: +96mV

Does not work. I can only go into BIOS.

And I have seen people running RAM at 2400 MHz with the same APU and with NB frequency at 2100 MHz and NB voltage + 72mV.
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a b à CPUs
August 13, 2014 3:20:02 AM

Anyone?
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a b à CPUs
August 13, 2014 6:36:08 AM

Slobodan-888 said:
Anyone?


It isn't possible. The only thing you can do is loosen the ram timings in the bios so you can run the ram at 2400. It is actually better to have tighter timings and a tad slower ram speed.
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a b à CPUs
August 13, 2014 7:01:50 AM

Loosen the timings by 1
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a c 93 à CPUs
August 13, 2014 10:47:59 AM

Could it be because of the motherboard not supporting it?

Try lower the voltage to 1.5 (you might have to reduce the memory frequency)
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a b à CPUs
August 13, 2014 11:11:59 AM

it may be factory tested but they did not test that ram in every motherboard on the market. There are similar stories across the web regarding 2400mhz Kingston ram.

I asked you to loosen the timings to see if it would boot. Have you tried it?
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a b à CPUs
August 14, 2014 3:06:53 PM

Slobodan-888 said:
I have tried this:

RAM: XMP-1 (2400 MHz)
NB: 2200 MHz
Vnb: +96mV

Does not work. I can only go into BIOS.

And I have seen people running RAM at 2400 MHz with the same APU and with NB frequency at 2100 MHz and NB voltage + 72mV.


Slobodan-888 said:
Yes I did, before, and no it does not work. It is because of memory controller of the CPU that officially only supports RAM upto 2133 MHz.

My motherboard supports RAM at 2400 MHz (OC).

http://www.gigabyte.com/products/product-page.aspx?pid=...


Kingston ram is notorious for crappy AMD compatibility. GSkill I never have any problems.
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a b à CPUs
August 18, 2014 8:21:41 AM

Can you please take a look at this? Those are benchmark results from SiSoftware Sandra.

These are memory bandwidth of a memory controller benchmarks:











These are video memory bandwidth of the GPU:









What can I do to improve this?

As I said, I use integrated GPU so I need the fastest RAM possible.
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a b à CPUs
August 19, 2014 12:50:43 AM

Any ideas?
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a b à CPUs
August 21, 2014 5:34:20 AM

Come on, tell me something.
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a b à CPUs
August 22, 2014 1:03:28 AM

I wanted to try overclocking RAM (and northbridge if needed) in AMD Overdrive. I have enabled AMP (AMD Memory Profile) in BIOS, but in AMD Overdrive it is still grayed out (can't change any settings in AMP).
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a b K Overclocking
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a b } Memory
August 22, 2014 1:57:28 AM

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
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a b K Overclocking
a b à CPUs
August 22, 2014 2:21:21 AM

Slobodan-888 said:
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.
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a b à CPUs
August 22, 2014 2:22:47 AM





2133 MHz:





2400 MHz:





And this, if needed:



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a b à CPUs
August 22, 2014 2:25:11 AM

cdrkf said:
Slobodan-888 said:
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.
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a b K Overclocking
a b à CPUs
August 22, 2014 2:36:28 AM

Slobodan-888 said:
cdrkf said:
Slobodan-888 said:
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-a10-78...

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.

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a b K Overclocking
a b à CPUs
a b } Memory
August 22, 2014 2:39:37 AM

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 )
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a b à CPUs
August 22, 2014 3:07:46 AM

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.
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a b K Overclocking
a b à CPUs
a b } Memory
August 22, 2014 3:56:38 AM

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
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a b à CPUs
August 22, 2014 4:02:51 AM

I use those slots because of CPU cooler. I will try to install them there.
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a b à CPUs
August 22, 2014 4:10:37 AM

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-...
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a b K Overclocking
a b à CPUs
a b } Memory
August 22, 2014 4:42:32 AM

what error code you saw ? ( i down't use debugging tools thus can't even open your memory dump file )
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a b à CPUs
August 22, 2014 4:44:06 AM

I don't know. Didn't pay any attention. (It is "Computer has recovered from an unexpected something...")
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a b à CPUs
August 22, 2014 4:52:15 AM

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?
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a b K Overclocking
a b à CPUs
a b } Memory
August 22, 2014 5:01:37 AM

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
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a b à CPUs
August 22, 2014 5:04:54 AM

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
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a b à CPUs
August 22, 2014 5:12:42 AM

truegenius said:
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.
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a b K Overclocking
a b à CPUs
a b } Memory
August 22, 2014 5:15:20 AM

0x7e :sweat:  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
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a b à CPUs
August 22, 2014 5:36:33 AM

I don't know what 2t is (what to change to 2, Command Rate (tCMD))?
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a b K Overclocking
a b à CPUs
a b } Memory
August 22, 2014 5:37:42 AM

yes, it is command rate, some times it can provide much stability
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a b à CPUs
August 22, 2014 5:48:24 AM

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.
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a b à CPUs
August 22, 2014 5:59:30 AM

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.
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a b à CPUs
August 22, 2014 6:23:24 AM

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?
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a b K Overclocking
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a b } Memory
August 22, 2014 6:39:09 AM

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
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