Testing only the turbo clock speed of an overclocked AMD FX CPU
Testing only the turbo clock speed of an overclocked AMD FX CPU
CPU: AMD FX 6120 @ 4.739 GHz @ 1.476V on all 6 core.
Motherboard: Asus Sabertooth 990FX r2.0
I'm wondering how to check just the Turbo speed when it's already enabled. I'm planning to enable Turbo in BIOS and increase it slightly since I'm stable at 4.838 but don't want to run at 1.572V continuously for constant overclocking. I'm sure now is stable, and this boost will activate only when the thread count is low. I need guidance on how to stress-test the Turbo frequency.
Can I use Prime95 to test just one core while still checking all 6 cores? Or would that not be possible? If this approach doesn't work, what's a better method to evaluate the Turbo speed?
I usually follow the temperature to voltage connection. When temperatures fall, electron vibrations decrease, allowing you to safely increase their directional energy (voltage). You can add about 50 millivolts for every 10°C drop below 71.1°C or 61.1°C. My CPU is at risk since it’s above 50°C, so I’m using a safety margin here.
To stay safe, just like those Phase Change enthusiasts who run between 1.65V and 1.7V, you should use:
- Stock 1.40V for temperatures over 90°C
- 1.50V for up to 71.1°C
- 1.55V for up to 61.1°C (FX 9590)
- 1.60V for up to 50°C
- 1.65V for up to 40°C
- 1.70V for up to 30°C
It’s clear that a chip at 90°C with 1.7V is essentially a “burning” stock chip. The transistors are really under strain. Higher voltage and heat speed up electron movement. At some point, chips start heating up...
You are already past turbo frequency, you'd be better off turning it off. Good OC btw.
There is a turbo core frequency multiplier that enables tuning the turbo frequency. (I realize my overclock has surpassed all standard and regular turbo frequencies, but still) I aim to enhance single-core performance while maintaining my 4.739 Multicore frequency. Whether this will function as intended is uncertain. However, since I'm near the stability limit, I plan to stress test the turbo frequency to confirm my stability.
It would be great to see if I can maintain turbo during any significant character edits. Just causes issues with the outcomes.
It's a decent average FX chip you have. I also achieved 201*23.5=4.72GHz at 1.49375V. If conditions permit, you might reach 4.90 GHz at 1.60625V. (similar to my FX 4350). Running ten trials of IBT with AVX at Standard should help determine if your setup is stable. To get the best performance from what you currently have, turn off 2 cores and run it with 4 cores. Most games already use four cores, and I think reducing cores can free up thermal headroom, possibly letting you push past 5.0 GHz—especially since Bulldozer is built for higher clocks than its predecessor. Good luck.
I aim for improved performance under the same voltage settings. I recently reached 5.0 @ 1.67V Stable after 2 hours of Prime and 20 runs of IBT on maximum, but this is just testing and not intended for regular use. Many of my games utilize all six threads my CPU supports, whereas point and click titles, older COD games, Crysis 1, and similar titles don't require the extra cores that newer games do, which would significantly impact performance.
Regarding Bulldozer versus Piledriver clocks, my observations suggest the Piledriver architecture tends to achieve higher clock speeds compared to Bulldozer.
Your IBT supports AVX, which doubles floating point operations at the same clock speed and helps detect instability during testing. With your FX 4350 achieving around 47 GFLOPs across 4 threads using AVX, a 20-hour IBT run would suffice. You’re managing 1.67V with 6 cores, but maintaining 1.60625V on 4 cores at 4.9 GHz under 71.1°C is challenging. It’s unclear if your chip is overclocking well or if reviewers are consistently testing top-tier chips. Your current 1.61V setting is being kept for continuous overclocking; aim for 4.9 or higher voltage, targeting stable performance around 5.0 before hitting the voltage ceiling on most FX processors.
The ability to run that voltage at that frequency comes from having an AIO liquid cooler and a high airflow case that maintains cooling efficiency.
For the IBT version I'm using, I'm running it at 2.54 and don't keep it running for 20 hours continuously; instead, I set it to perform 20 runs with the maximum available RAM. With my 6120 model, Prime 95 has proven more reliable in detecting errors compared to IBT.
I avoid pushing that high voltage for continuous operation because it significantly harms CPU longevity. Exceeding the recommended voltage leads to voltage degradation, which eventually makes the chip unstable at that level much faster than expected. To maintain performance gains beyond 300 MHz, a small increase of 0.2V is necessary, but the results aren't worth the risk. If the CPU temperature reaches 71.1°C, it's likely throttling or the software isn't measuring temperatures accurately. I suggest using AMD Overdrive and monitoring the Thermal Margin to prevent throttling. Overclocking involves balancing core frequency, voltage, and temperature—not just chasing record speeds. The FX and A-series CPUs begin throttling around 62°C, causing a drop in performance as the core frequency decreases.
I discovered how certain chips manage high clock speeds with reduced voltages. You should look into the Intel chip's delidding process—it cools them down by about 10°C, which in turn enables further undervolting. It also clarifies how 8 GHz can be achieved using just 1.9V; because extremely low temperatures raise circuit resistance, more voltage is required to maintain the same current flow through the CPU. Pushing higher voltage becomes necessary, and the only solution is to get colder when voltage no longer helps, which explains why high-end overclocking setups like Phase Change are preferred. Have you tried cooling your CPU? I cooled my FX 4350 by lowering the temperature from 75 to 68°C, reducing the voltage from 1.60625V to 1.58750V, and after several trials, I further lowered the VCore to 1.58125V at a stable 62°C. That’s why you’ve been using so much voltage for such high performance. It’s the trade-off for real stability, isn’t it?