As title says, both 5v and 12v (but quite less compared to 5v) drop in correlation with CPU undervolting on motherboard (MSI 970a-g4x). It is related to CPU VID, and, since CPU VID is way too high, and there is no option for LLC, I'm sort of stuck with it.
So, question is, is it possible to prevent this behavior? Any workaround? I've triied everything i could think of.
Here is an example, if i undervolt CPU to 1.14v from original 1.3875v (~1.4v), 5v line goes at/or bellow 4v (can't really remember, i think even 3.6+v), while 12v goes at about ~11.3xv (don't quote me on that, but it does drop bellow 11.7).
I want to know what is the cause of this behavior, is it 4+1 implementation, and if is posible to do something about it (to undervolt CPU, while keeping 12v and 5v at ideal voltage)?
I could fool BIOS to think that CPU VID is 1.xv (what i choose), by using AMD overdrive, regulating CPU voltage in OD, restarting computer, entering the BIOS, and looking at what is lsited under information CPU VID = choosen voltage in AMD overdrive, but it doesn't seem to ahve impact on forcing "Auto" function to follow that rule, and also,a fter shuting down, it will change that information. So that seems it is not solution, i will try now, but just to post it first here, in hope that there is some explenation for this, and possible solution.
Thanks.
Which cpu do you have on the board?
FX-4100. Default voltage is 1.3875v, and i tried to change with trick described above, however, it still drops 5v and 12v, but 12v very little, it have huge impact on 5v, with just udnervolt of 1.320v-1.340v (for example), 5v rail go down to 4.5v-4.6v already.
Hope someone knows what is the deal here.
and if you disable cool n quiet?
You still get those voltage drops?
Yes, it is same behavior, in corelation with CPU voltage, C&Q makes CPU voltage lower = 5v lower. Without, same thing, CPU undervolted = 5v lower.
I suspect it is some fishy trick on mb 4+1, but question is how to solve it.
yeah well that msi mobo, has well know voltage throttle issues. the cheap 4+1 powerphase an cheap vrm´s are not that great at all.
Maybe a bios update, is something to try. In the worst case scenario, you gonne need to replace the board..
Yeah, I assumed that, but hoped that someone would put exact problem with, is it possible to solve with BIOS update (i use first version of BIOS, and i bricked one g46 board already, so I'm not quite positive about BIOS update on this board = that is firs BIOS update failure i had in life, after doing updates on other boards at least over 30 times, probably much more).
There are no drops under normal voltage usage (except when using C&Q), but since VRM's go hot on summer,a nd summer is comming, for sake of keeping PC and room cold, and easier to cool down, that is the reason of undervolting (cooling solutions are irrelevant, since energy is released no matter what). Maybe i will try BIOS update.
PS: BIOS update would be useless, same thing happens on G46 board.
just disable cool n quiet then. your mobo will not run much hotter wenn c&q disabled. ive got my c&q disabled all the time, over a year. not any problem. But offcourse i do have an Asus board. In my opinnion that whol c&q feuture is not that great at all.
Well, actually, it plays big role with stock cooling, so, it is better to stay enabled.
Anyway, C&Q is not the problem, problem is correlation between voltages, however, i did menaged to find lowest acceptable voltage (computer does function even if CPU voltage is just 1.14v, but it is not to my liking) of 1.362500v, and that should be acceptable for summer temperature also, will see.
Anyway, till the complete PC change, i would probably not bother with this, at least, someone may find this thread, and see that it is better to spend mroe on Asus or MSI board (before getting it) because of those limitations (and some others). Thanks anyway.
i used the stock cooler on my FX8350 over a year. with disabled c&q
my FX8350 runs at 1.368V on stock speeds. But it is offcourse a diffrent cpu. But with c&q enabled, my cpu voltage jumped constandy wenn idle it was at 0,900V 1.3GHZ and wenn in use 4.3ghz at 1.40V, and it personaly did not realy like those big jumpings caused by c&q so i disabled it. ☺
Well, that CPU works on quite a bit lower voltage + it have better cooler :). I don't mind changing in voltage, it doesn't affect the system, and that is important, but what i do mind is 5v changing togheter with CPU voltage, but that is just the way motherboard is "tricked" by manuf. in order to save some $ in production i guess. 12v doesn't have huge drop, so for now, it is fine, not ideal obviously (in ideal scenario, i would put CPU at 1.1x-1.2x volts, and 12v and 5v would stay at that range or close to by +-0.100).
yeah its still a bit strange that your 5V drops as well. With my motherboard,Asus M5A97 EVO R2.0 i had this issue once, and i got a warning about it from Asus suite. But it only happend to me once. So it doesn´t seem right, if it does it constantly. But yeah those Msi am3+ boards are not realy the greatest quality.
Have you checked your PSU? Swapped it out with another? I've had a PSU that actually was failing and it was dropping voltages left and right for the 5V and 12V.
True, probably the board is at bad, I must admit that if CPU voltage is normal (Auto by board), there are not drops (without C&Q, with it, "normaly" it will corelate wtih CPU voltage).
Yes i did, however, it is not PSU fault, because it is corelation with CPU voltage (eg. if CPU voltage is at stock/Auto and under full stresstest it do not drop bellow 5v and 12v, it is quite contant in +-0.0x0v range).
I don't have solution for lowering CPU voltage and keeping 5v at acceptable level of 5v +-0.100v, however, i will try some more things, when remember.
At the end, it turns out it was missreading bug in basically al programs. All is fine now.