The fixed core voltage and fixed CPU ratio are suitable for extended use (20/7).
The fixed core voltage and fixed CPU ratio are suitable for extended use (20/7).
Hi,
I just set up my first computer about a month ago and am still learning about overclocking. I found the FIT voltage for my Ryzen 3300x to be 1.263 v average with PBO Enabled (Prime 95 Small FFT). I adjusted the motherboard settings, setting the Fixed CPU frequency ratio to 43.25 and a Fix Voltage to 1.25. The system runs smoothly, but I’m wondering if fixed clocks are stable on Ryzen 3000 models. Also, my temperatures never go above 71°C with Deepcool Gammax GTEv2 air cooler.
My machine specs:
- MSI B550m Pro VDH Wifi
- Ryzen 3 3300x
- RTX 3070 FE
- Gigabyte P650b 650W PSU
How have you stress tested your system? It probably doesn't need something like Prime 95, small FFT for 24 hours stability test but you might like to know the occasional AVX-heavy workload that comes along doesn't crash it out randomly.
Also, have you performance tested it? When set up right Ryzen 3000 is very dynamic in operation and very hard to overclock with good effect. In particular it usually gives much higher performance in lightly threaded work loads than when clocks are locked with a fix, stable, CPU frequency. Since we most often use it in lightly threaded workloads (that's gaming, BTW) it makes little sense to gimp it's performance by locking it. Test it with CB20, both multi-thread and single-thread tests.
And lastly, when set up right it can spike temperature even at idle and that makes people think it's running 'hot'. It's not really, it's just a characteristic of the 7nm process used. Instead what you need to do is set up a custom fan profile if that is what is bothering you.
Fair enough
I haven't used games to test or compare my CPU performance.
I ran CB 20 multiple times in quick succession, consistently getting scores near 2530.
Prime 95: 3 threads caused an error within the first 5 minutes.
I don’t do video editing, rendering, or streaming.
My regular tasks involve some programming (not too demanding on CPU) and 1080p gaming.
My CPU usage peaks during game installation or extraction, which can last about 2 hours in certain cases.
Edit: Forgot to include this.
Regarding temperatures, I have strong airflow with a front mesh cabinet and an air cooler.
Prime 95 reaches up to 80°C, while CB 20 stays at 73°C.
Thanks for the reply.
This is the actual hint... it indicates the voltage must be increased. However, the urgency depends on the specific test being performed. During a balanced stress test, it typically takes around 5 minutes for the system to shift from a large FFT that strains the CPU to a smaller one that functions efficiently. This could be the cause.
It also effectively mimics more demanding tasks such as rendering, where similar transitions occur. Alternatively, if you're involved in a distributed computing initiative like Folding@Home, it too will behave this way and might lead to crashes. Or worse... you return the next day only to discover your projects were rejected due to mathematical errors.
I understand the system becomes somewhat unstable under such heavy workload. I lowered the clocks to 4.3 (from 4.325) and set Core Voltage to Fixed at 1.25v. I don’t want to raise Core V further, as I plan to use the chip for at least two years. The Small FFT prime 95 still causes errors, but after about ten minutes of testing on two threads at 84 C, it no longer crashes and CB 20 also remains stable. I’ll continue using these settings until I notice a crash or error in regular operation. Regarding my question, I believe the answer is that fixed Core V and clocks are stable even under idle load. Please let me know if this is incorrect.
1.3 -1325v or near it matches the safety of 1.25v. It's beneficial to use it for maximum stability. Ryzen can handle more than 1.5v without causing harm.