overclock 3900xt

ard-tullaich · 27 Jul 2020 at 22:21

Hi All
new to overclocking AMD cpu's
been running intel for last 15 years.
Need help in overclocking the 3900xt to 4.4gb all cores.
Really need a walk through in bios totally different to overclocking my 17 920.
should have bought overclockers pre clocked bundle.
but i was bought this earlier this month by my wife.
amd 3900xt
gigabyte aurus master x570.
Crucial 32 gb 3200 hz
cooler corsair h115i platinum.

PhoenixUK · 27 Jul 2020 at 23:59

leave it stock it will do 4.3-4.4 all core when needed and will boost to 4.6-4.7 single core. Otherwise you will lock all to 4.4 and it will also pump a ton of heat (yes, even for h115i)

Maybe lower the voltage as the auto voltage can get quite high for no reason, set it to 1.35-1.4 and see how that goes.

My 3900 can do 4.4 all but with dumb voltage which makes no sense, running it instead at 4.25 @ 1.28v and it runs 15c cooler instead.

So there we go, not worth it, just lower voltage and leave it on auto to do its thing.

merlin6r · 29 Jul 2020 at 23:33

PhoenixUK said:
leave it stock it will do 4.3-4.4 all core when needed and will boost to 4.6-4.7 single core. Otherwise you will lock all to 4.4 and it will also pump a ton of heat (yes, even for h115i)

Maybe lower the voltage as the auto voltage can get quite high for no reason, set it to 1.35-1.4 and see how that goes.

My 3900 can do 4.4 all but with dumb voltage which makes no sense, running it instead at 4.25 @ 1.28v and it runs 15c cooler instead.

So there we go, not worth it, just lower voltage and leave it on auto to do its thing.

Agreed^^

Leave it at stock and let the boost handle it.

PieEater · 30 Jul 2020 at 07:15

As above there is no point in setting an all core overclock of 4.4 your CPU will boost above that when required without the need for a fixed voltage and associated higher temperatures. These Zen2 CPU's are just too good at managing their own performance that there is not much left to squeeze out.

I do have to strongly disagree with PhoenixUK, setting a fixed vcore of over 1.35v is totally unnecessary, will restrict single core boost speeds, and has the potential to degrade the CPU especially at 1.4v. The only safe way to reduce voltage is to use a negative offset however even a minor offset can affect performance so I really wouldn't bother.