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AMD Kaveri Refresh A10-7870K Apu arrives. - Page 46

post #451 of 532
Thread Starter 

I doubt if the stock cooler could get the CPU to 4700MHz, let alone maintain it there under load.

 

With APU Frequency at 107MHz you also have a hefty OC on RAM, iGPU and NB and I notice you have VDDNB at 1.3375V, presumably indicating a 1040MHz GFX divider and a GPU speed of 1112MHz. If you also have the memory divider set to 2400MHz, setting RAM to 2568MHz, you are pushing your system far too hard for the stock cooler to manage.

 

 

 

It would explain why the fan is up to 2300rpm on idle with such a high combined overclock and - assuming your system is stable - demonstrates just how much work your Corsair must be doing for you once you put the system under load.

post #452 of 532
My RAM is a 16GB Kit (2x8GB) of Corsair Dominator Platinum @ 2133. It is overclocked a little with the 4.7GHz OC. The 2200RPM on the CPU fans is actually the RPMs of the H100i pump.

Edited by edrak78 - 2/26/16 at 3:20am
post #453 of 532
Quote:
Originally Posted by Himo5 View Post

I doubt if the stock cooler could get the CPU to 4700MHz, let alone maintain it there under load.

With APU Frequency at 107MHz you also have a hefty OC on RAM, iGPU and NB and I notice you have VDDNB at 1.3375V, presumably indicating a 1040MHz GFX divider and a GPU speed of 1112MHz. If you also have the memory divider set to 2400MHz, setting RAM to 2568MHz, you are pushing your system far too hard for the stock cooler to manage.





It would explain why the fan is up to 2300rpm on idle with such a high combined overclock and - assuming your system is stable - demonstrates just how much work your Corsair must be doing for you once you put the system under load.

What program is this? I'm interested in it.
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post #454 of 532
Thread Starter 
Quote:
Originally Posted by edrak78 View Post

My RAM is a 16GB Kit (2x8GB) of Corsair Dominator Platinum @ 2133. It is overclocked a little with the 4.7GHz OC. The 2200RPM on the CPU fans is actually the RPMs of the H100i pump.

So you have the memory divider set to 2133MHz, giving a slight 2282MHz OC on it, and have NB Frequency set to 1800, pushing it to 1926MHz. Yes, I assumed the 2303rpm reading in AI Suite III was the H100i, and wondered what it had left to give once the system was under load.

post #455 of 532
Thread Starter 
Quote:
Originally Posted by SpeedyVT View Post


What program is this? I'm interested in it.

It's a gadget for calculating the interconnected bus speeds on APUs. I was going to develop a facility for loading the divider comboboxes from an INI file according to processor, motherboard and BIOS version only the project got lost when I couldn't work out how to publish a zip.

post #456 of 532
Quote:
Originally Posted by Himo5 View Post

It's a gadget for calculating the interconnected bus speeds on APUs. I was going to develop a facility for loading the divider comboboxes from an INI file according to processor, motherboard and BIOS version only the project got lost when I couldn't work out how to publish a zip.


It's a very beautiful looking tool though.
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post #457 of 532
I have just moved from the 860K to the 7870K. I am really impressed with the much less high voltages required at the same frequencies.

One thing I don't understand though. If I set the vNB at a specific value, it keeps that even when I stress test the CPU. But as soon as I stress the GPU, it jumps at a predefined value (1.28 I believe). I have ready from TheStilt that vNB is stable at much lower voltages even during 3D, so I am a bit confused...

Is there a way to set the vNB at a certain value and have that to stay there even when gaming?
post #458 of 532
Thread Starter 

I don't know what motherboard you are using but with the A10-7870K the Asus A88X-Pro automatically adjusts VDDNB according to the GFX divider: to 1.225V for anything below 975MHz; to 1.25V for 975MHz(Turbo); to 1.3375V for 1040MHz(Extreme); and to 1.3875MHz for 1114MHz and above.

 

The way to circumvent this would be to adjust APU Frequency which then multiplies the current graphics divider (divided by 100) to produce a new iGpu clock. This would obviously require you to make your own VDDNB setting for the speed you wanted.

post #459 of 532
Quote:
Originally Posted by Himo5 View Post

I don't know what motherboard you are using but with the A10-7870K the Asus A88X-Pro automatically adjusts VDDNB according to the GFX divider: to 1.225V for anything below 975MHz; to 1.25V for 975MHz(Turbo); to 1.3375V for 1040MHz(Extreme); and to 1.3875MHz for 1114MHz and above.

The way to circumvent this would be to adjust APU Frequency which then multiplies the current graphics divider (divided by 100) to produce a new iGpu clock. This would obviously require you to make your own VDDNB setting for the speed you wanted.

I've got an Asrock FM2A88X-ITX. I can set the vNB just fine but then from Overdrive I see this is being raised to 1.275 everytime there's GPU activity. On the other hand, I've managed to avoid the automatic throttling to 3GHz by setting up a profile with MSR tweaker, in which all the states have the same voltage and frequencies. smile.gif

Anyway, since already 975MHz for the GPU proves to be unstable, I think I would not be able to undervolt it that much. I managed to lower the VID to a juicy 0.975v for 3GHz, though.
post #460 of 532
Himo,

Knowing what you now know about my build, would the stock cooler work for cooling or should I stick with the buggy H100i and Corsair Link?
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