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It’s been a year since our FX-8150 and Crosshair V Formula overclocking guide, so we’ve updated it for our AMD fans to cover ROG’s Crosshair V Formula-Z and the new FX-8350 CPU, overclocked to 4.8GHz. As ever, overclocking is never guaranteed. Your mileage will vary depending on the components, such as level of cooling, quality of power and memory and environment (humidity and ambient temperature etc) and of course, the CPU you use as despite having the same FX-8350 name, not all silicon is made equal.

If you’ve got further overclocking questions join us in our OC forum, or if you have problems with your Crosshair V drop into to the Crosshair forum.

Installing the CPU

  • Release the CPU socket arm, and lift it into an upright position
  • Install the CPU. No force is required, just drop it into the socket in the correct orientation, and the CPU’s pins will sink all the way in. Match the golden triangle on the corner of the CPU to the marker on the CPU socket. Don’t force the CPU; breaking any of the pins will kill it!

CPU-and-socket

  • Lower the socket arm and lock the CPU in place
  • Add thermal paste in a thin layer across the top (as necessary). Use a flat edged item such as an old credit or debit card to smooth the thermal paste flat and even.

TIM'd-up-CPU

  • Fit your CPU cooler of choice – Overclocking an FX-8350 to 4.8GHz WILL require a high end cooler. We’ve used a Corsair H80i here, but any similar liquid cooler will work too. You’ll notice we’ve dropped in a pair of memory DIMMs as well.

CPU+Cooler

A word on power

The Crosshair V Formula-Z is equipped with an additional 4-pin CPU power connector. While fitting it isn’t necessary, it can help the stability of high-level overclocks such as the one we’re attempting here. If your PSU doesn’t have one spare, don’t worry!

power-connctors

Before we start

Be sure to download the latest version of the board’s BIOS and extract it to the root directory of a flash drive. You can then use the EZ Flash utilty in the BIOS Tool menu to easily update the latest version.

c5fz bios version

You should also download (or install from your driver disk) Asus’ AI Suite II. The thermal sensor on the FX-8350 is not read by some thermal monitoring programs. We’ll be using AI Suite II to monitor temperatures and voltages, CPU-Z to monitor CPU status/frequencies and Prime95 to check the stability of the overclock.

Make sure everything works

As always, before you start overclocking, you should Install/boot windows and make sure everything works first.

  • Start the system and enter BIOS (image BIOS welcome)
  • Press F5 to load optimized BIOS defaults (image reset to defaults)
  • Hit F10 to save the BIOS and restart
  • Boot Windows
  • Open CPU-Z and AI Suite II
  • Run Prime95 and select the CPU intensive Small FFT test – the CPU should clock up to 4.0GHz, the maximum clock speed of this chip.
  • As you can see, at its default clock speeds the FX-8350 runs quite happily at a temperature of 49°c. This was performed in a room with an ambient temperature of 24°C, so a 25°C delta-T is great.

stock, load, 4.0

Over on page 2 it’s time to tweak!


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Comments

FlanK3r03-12-13 11:20 AM Reply With Quote
SOmetimes you can set higher VDDA voltage (stock is around the 2.5V), it is something as PLL at Intel chips. You can try values between 2.6-2.7V for 24/7.
The same things is for CPU/NB (dont use more than 1.35V for 24/7), it can help with high clock memory and CPUNB clocks. There is condition, CPUNB clock must be minimal as DRAM Clock*2 (so eaxmple 1200MHz DRAMx2 = 2400 MHZ DDR3, u need at least 2400 MHz CPUNB).
FX can working at 3000 MHZ HT without problems, default is 2600 MHz. FX Vishera can working at 2600 MHz CPUNB, default is 2200 MHz (Bulldozer had problems over 2500 MHz with 24/7). High CPUNB clock is not necessary, the performance gain is smaller than with Phenoms II CPUNB. You need it only for high clock memory profiles.
Older board C5F must have APM master set disabled
dont forget at CPU current limits, for OC is better set about 130.
For very high FSB or very high clock memory you can set TRFC at 300ns+. You can see difference.

And thats my next tips :-)
how important is that 4pin? if i want to take it higher than 6ghz do i need that connector? if yes, which voltage goes thru those 4 cables, ill try to modify my OCZ FATAL1TY so is complient with oc requirments ..
Zka1703-13-13 09:59 AM Reply With Quote
For 6GHz on the CPU, you definitely need to use the 4-pin power connector too (you should not have to modify your PSU for that)! What cooling are you gonna use for that speed?

You need a single modification with that OCZ Fatality PSU... - change it as soon as you can, get something more reliable, more safe... before it start killing your other components...
FlanK3r03-13-13 02:14 PM Reply With Quote
I was OK with 8-pin with good PSU at 8 GHz...Its good for hard CPU benchmarking with LN2, but not for superpi, validation, hexuspi etc
Zka1703-13-13 04:40 PM Reply With Quote
It's not about the frequency of the CPU, but more about it's power draw... - having more cables plugged in will balance the load on the connectors... it's gonna be more stable...
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