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MarshallR

Guide: Overclocking FX-8350 To 4.8GHz On Crosshair VFormula-Z

Time to TweakWhile there can be signif icant variation between CPUs, the AMD FX-8350 is pretty reliable in its limits andrequired voltages; most samples should be capable of this 4.8GHz overclock given suf f icient cooling. Thatsaid, there’s always the random sample element in any overclocking; if you’re unsuccessf ul, just drop themultiplier in single increments until stable, and then dial back the voltage to match.

First make sure the UEFI BIOS into its Advanced mode . ROG boards should automatically def ault tothis view.

Select the f irst Extreme Tweaker tab

Set the CPU Ratio to 24; you’ll notice the target CPU speed at the top increase to 4,800MHz (imageCPU ratio to 24)

Set the Memory Frequency to your desired setting; we’re using DDR3-1,600MHz here.

Scroll down the page to CPU & NB Voltage – ensure it ’s set to Manual Mode

Set the CPU Manual Voltage to 1.5V. It will show up red, but this is f ine; just don’t go pushing it toomuch f urther.

Go back and select the DIGI+ Power Control Menu

Set CPU Load Line Calibration to Ultra High

Next, look to the top line menu buttons and click on Advanced.

Select the CPU Conf iguration menu

Here, set Cool ‘n’ Quiet to Always Disabled.

Make sure that C1E is set to Disabled.

You may also wish to disable Core C6 State, which controls core idling

Be sure to save the overclock as a Prof ile in the Tool menu, so you can load it quickly shouldanything happen

Finally, hit F10 to save your changes and restart

Stress TestWith the overclock applied, boot back into Windows and repeat the earlier stress test, running AI Suite II tomonitor temperatures and CPU-Z to check f requencies. In CPU-Z the CPU should now report as running at4.8GHz (or marginally higher depending on baseclock f luctuations). However, you’ll also notice the CPUtemperature has increased a lot too; our setup here recorded a delta T of 49°C. This is hot, as expected,but still within the TJMax of the chip though.

Is that all stable? Good. The voltage we’ve applied here of 1.5V can now be reduced. Go back into the BIOSand try small voltage drops without reducing the clock speed. This chip was able to run stable with avoltage of 1.49V, but reducing it f urther caused instability as indicated by Prime95 errors. You can alsof urther reduce power draw by attempting to drop the Load line Calibration setting to Extreme or High, butagain, there is likely only minimal room f or this if you want to achieve a stable 4.8GHz.