problem using APU 2400g while mining with dGPU

eftaps

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Dec 30, 2017
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I used to have a motherboard from ASUS(a320m-k) and a a8-9600 APU and used it with a dGPU (zotac 1070 mini currently, but used also others before that) to mine crypto while using the APU onboard graphics to work and play games. I then decided to go for better m/b with more full size pci-e slots and a better APU so i bought a gigabyte ab350 gaming 3 and a ryzen 5 2400g.

Here is a list with problems and questions;

a) I cannot use auto in uefi to boot with iGPU, i need to force it. If i leave it on auto, it still chooses the dGPU even though i have the HDMI cable connected on the motherboard.

b) whenever i try to mine using the iGPU all seems ok, until i try running any game. I try f.e. to play League of Legends and not only i have lots of stuttering in medium settings but also it seems that somehow it interferes with the zotac dGPU and my hashrate lowers about 5-10%. This is something i did not experience with the asus m/b and a8-9600 cpu. The gaming experience was better and no interference with hashrate, even though it is a worse APU. Also in MSI afterburner there are no real values for the dGPU usage, temperature, only for the cpu and the dGPU, while on task managers it shows iGPU usage. While i mine there is no dGPU usage showed on windows task manager but all is showing OK for dGPU in MSI afterburner.
The procedure i used to install is the following. After installing windows 10 latest version provided by Microsoft, i first installed the latest chipset drivers from amd, then the latest radeon drivers and last the nvidia drivers.

c) I have read in several reddit forums that the soc voltage should be not left at auto in xmp profile for my ram, but rather lower it to +0.000. What do you think?

Please i need a solution for (b) ASAP and some answers for (a) and (c) if possible! I also contacted gigabyte and amd asking the same questions. I hope i can get a response from them also.

system:
gigabyte ab350 gaming 3
AMD ryzen 5 2400g
corsair 2x8gb ram cmk16gx4m2b3000c15
zotac 1070 mini
samsung evo 850 250gb
external usb 500gb HD
corsair cx500 PSU
 

gasaraki

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Jun 11, 2008
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A) Functioning as designed. If you have a dGPU, it will choose that in Auto mode.
B) AMD has been really slacking with the APU drivers. Slow updates and performance issues.
C) Why? Does your board have some type of bug?
 

eftaps

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Dec 30, 2017
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a) in asus when using auto on bios, it would choose the apu when the cable was on mobo, maybe that can resolve issues with (b)
b) i would not expect it to be driver issues, since the a8-9600 apu used to work perfectly on the same am4 platform without conflicting with the dGPU.
c) the soc voltage moves to 1.2x territory with xmp ram ON and values soc voltage on auto. Users seem to suggest to move it manually to 0.000 so that the soc voltage value returns to 1.1 . But as some people have stated that may not be the case for 2400g since it is not a cpu, rather an apu, and maybe it can operate in 1.2x territory without harming the CPU. There is a video in youtube also if you research how to kill your cpu if you want more info on what i mean.
 

eftaps

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Dec 30, 2017
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I have tried to experiment on the psu, i used 55% power limit on dGPU from msi afterburner with no oc on core and memory clocks, still same problem appears. When the dGPU is idle i can play LOL on high/very high settings with no stuttering and much higher max and avg fps than when having medium settings and dGPU mining. Was the PSU the problem, lowering power draw for the dGPU should have solved the problem IMO.
 

eftaps

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Dec 30, 2017
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dGPU was being used because of the settings in nvidia control panel; i had to choose dedicated graphics option in "manage 3d settings">"global settings" menu
i am leaving the question open in case someone has an answer for (c)