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

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Slobodan-888

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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?
 
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bmacsys

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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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Slobodan-888

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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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bmacsys

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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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Slobodan-888

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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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bmacsys

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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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Slobodan-888

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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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bmacsys

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Figure it out yourself then.

 
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vmN

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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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Slobodan-888

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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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LucoTF

LucoTF

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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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bmacsys

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Kingston ram is notorious for crappy AMD compatibility. GSkill I never have any problems.
 
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Slobodan-888

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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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