Ryzen 9 3900x IF clocks (FCLK)

[LUK]

Hi,

 

just finished upgrading my system with the Ryzen 9 3900x chip (Asus prime X570-pro MB).

 

As this is just an upgrade, the rest of the components are the same: Asus gtx1080, Samsung 970 pro SSD and Corsair vengeance LPX 32gb 3000MHz CL15.

I know my RAM is slow, so I decided to mitigate the situation by overclocking the IF to 1800MHz. Since AMD recommends 3600Mhz DRAM clock, it should be OK, but it's not. The system immediately crashes.

 

My question is this: is the system instability caused by the IF OC and RAM speeds (1800:1500) being too far apart or did I get massively screwed at silicon lottery?

 

Thank you in advance.

 

PS: this is my entire overclocking experience.

[porina]

Take things one step at a time. Is the system stable if you run ram at 3000, IF at 1500? Only when you proved that, try 1800. If it crashes instantly, try 1700.

 

There should be no problem running different clocks, that's the whole point of the option being there. However we should regard anything above 1600 as an overclock, since that is the speed it would run at with supported 3200 ram speed. I haven't heard of anyone not being able to have stable IF at 1800 before, but it is a possibility you lost the lottery on that part.

[LUK]

4 minutes ago, porina said:

Take things one step at a time. Is the system stable if you run ram at 3000, IF at 1500? Only when you proved that, try 1800. If it crashes instantly, try 1700.

Stable at 1500, 1600 and 1700. I tried them all. Decided to leave it at 1600 which is technically not an OC. Must be a bad chip. Oh well...

 

Thank you for the advice.

[porina]

1 minute ago, LUK said:

Stable at 1500, 1600 and 1700. I tried them all. Decided to leave it at 1600 which is technically not an OC.

Run some benchmarks of things you care about performance of at 1500 and 1600. There is some latency penalty when not running synchronised, and depending on the use cases that may be better or worse than the increased IF speed.