Attempting to boost performance of my AMD FX8350 processor
Attempting to boost performance of my AMD FX8350 processor
Let's begin with your PC specifications:
I utilize AMD Overdrive for overclocking.
AMD FX-8350 4.0GHz 8-Core Processor
Corsair H80i 77.0 CFM Liquid CPU Cooler
Asus M5A99FX PRO R2.0 ATX AM3+ Motherboard
Patriot Viper 3 Low Profile Red 32GB (4 x 8GB) DDR3-1866 Memory
Corsair CSM 750W 80+ Gold Certified Semi-Modular ATX Power Supply
Gigabyte GeForce GTX 970 4GB WINDFORCE 3X Video Card
Right now, I've managed to push my computer from 4.0GHz up to 4.4GHz at a voltage of 1.3875V (CPU VID), and kept the NB VID at 1.1625. This performance has been stable and excellent; however, I aim to take it further. When attempting to exceed 4.4GHz, my screen freezes during stability tests, requiring a restart. I'm seeking guidance on reaching approximately 4.8GHz while ensuring safety. Additionally, I'm confused about the distinction between CPU VID and NB VID—any clarification on this would be helpful.
CPU VID and NB VID begin at their respective starting voltages for each component. For over 4.4 volts, you might need a higher voltage. AOD restricts operation to its safety limits, so for genuine overclocking you should use the BIOS, not the software. It's best to disable all power-saving and turbo features during overclocking and testing to prevent unintended changes.
CPU VID and NB VID begin at their respective starting voltages for each component. For over 4.4 times the base frequency, you might need increased voltage. AOD restricts operation to its safety limits; for genuine overclocking, use BIOS rather than software. It's recommended to disable all power-saving and turbo features during overclocking and testing to prevent unintended changes.
Yes^
It's not assured you'll reach 4.8. Every silicon type is unique. You might have reached the limit.
CountMike provided guidance on starting voltages for CPU VID and NB VID, noting higher OC may require increased voltage. AOD restricts safe operation levels, recommending BIOS instead of SW for real OC. It's suggested to disable power saving and turbo modes during OC and testing to avoid frequent changes. He shared his experience tuning OC in AOD by adjusting voltage and MHz, followed by a stress test. He also asked if a stress test is available directly in the BIOS.
Burgessanthony:
Yep^
It's not guaranteed to reach 4.8. Every silicon is unique. You might have reached the maximum. I've seen that AMD FX 8350 can exceed 5.0 GHz in a controlled setting, though I'm not certain. The idea that all CPUs are different even with identical specs seems to be what you're asking about.
CountMike provided guidance on voltage requirements and BIOS settings for achieving higher OC. He emphasized avoiding overclocking beyond safe limits and recommended disabling power-saving features during testing. He also shared his experience of successfully running a stable 4.7ghz CPU after adjusting BIOS settings, and asked about handling temperature concerns if issues arise.
It's very likely it will throttle down or shut down before any terminally critical temperature is reached. Just go in small steps and check all the parameters during testing.
As for "Silicone lottery" you have to know how chips are graded.
Whole of FX 83xxx series are same architecture and made on same machines and of same materials but because of production tolerances don't come out identical. Even before core element (the real chip) is placed into package (whole processor with pins and everything) they are tested and by results of that testing they are microcoded for it's final designation. That's how it ends up being just plain 8300 or 8320, 8350 or 8370 for instance or maybe even 9xxx. Even within each group there's finer graduation and it's reflected by it's "Stepping number" with "C0" being best of the batch and with most OC potential.