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Overclock an ASUS M5A99X EVO with FX-8120

post #1 of 6
Thread Starter 
Hi guys i'm new here.
I just bought an asus m5a99x evo with a fx-8120, and the graphic bios with hunderts of features scared me after the asus p5q3 deluxe with the old character bios what was easyer to understand for me.
so i would like to overclock the stuff. i have 2x4gb geil value plus 1333, and a huge macho cooler on the cpu. there is an auto tuning feature in the bios but i don't trust the machines. like Robert Brewster (Terminator3) said: "I still prefer to keep humans in the loop."
i like to ask your help to innercase the speed - what doesnt makes any sence cause this is one of the fastest pc cpus. and of corse not burning the mb or the cpu nor the rams.
besides the cooler is so huge that i can only use the 2nd and 4th ram slots, so buying additional 2x4 ram is not possible frown.gif
what sould i change, what do i have to modify and try to get the most out of the stuff?
best regards
rigo
post #2 of 6
Hey mate, the first thing is don't worry about the ram yet, and don't worry about burning anything.

The first thing you are gonna want to do is see where the "Multiplier" setting is. That is mainly all you will need to OC that CPU.

It's a pretty basic setting, all you need to do is increase is one by one, and if it gets unstable increase the Core voltage 0.025 up to make it stable again. And also keep a strong eye on temps, as you don't really want to go over 65C or so.

hope that helps a little.
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post #3 of 6
Thread Starter 
hey
thanks for helping me oc my stuff.
by the old 775 asus board + q9400 they told me not to leave anything in "auto" mode cause the board can auto overdose some voltages. is this safe now with this new board? so i dont have to set the voltages everywhere manually?
what is the highest voltage what i sould use? what is the highest ghz i can hopefully reach? 4-4.2?
cheers
post #4 of 6
I own a ASUS M5A97 PRO which is the same as the M5A99X EVO but with a lower chipset. On reviews they do state how similar overclocking is with these two boards so I can only say this from my experience.

Apply manual voltages. I am not sure if ASUS has addresses the issue but I have found with "Auto" the board can apply 1.4125 voltage to the CPU for stock, which is definitely not needed. Also, it sets my RAM to 1600Mhz, when my RAM is only rated at 1333mhz. Another annoying problem I have found is that "Auto" ups the FSB/HTT automatically, and proves to be unstable.

It may not be the case with all boards, but setting voltages, DRAM speed manually may be the safest way so you know for sure those values are applied.

In terms of overclocking, I can only get my FX-6100 up to 4.2Ghz just over the safe 24/7 limit (over 1.4 CPU VID). With the FX-8120 it requires a lot more power, so you may not be able to achieve a higher overclock. A lot of us have found with my board (M5A97 PRO) is that it is difficult to overclock using the multiplier, I think it may be a BIOS issue so I have contacted ASUS on the problem. The phases are definitely capable.

Getting your FX-8120 to 4.4Ghz may be a struggle.

The board has a nice feature called load line calibration. To overclock I HAD to use this.
For example, overclocking to 4.0Ghz needed LLC to extreme, so that CPU Vcore hit 1.380. For 4.2Ghz I needed 1.36, so Vcore hit 1.392/1.402.
Again I think it may be a BIOS issue not being able to deliver the power required, because the board was released before Bulldozer.

Either way, you should be able to achieve 4.0Ghz without any chances to voltage except LLC to extreme. Raising multiplier is the easiest way to overclock in general
post #5 of 6
And of coarse watch the heat, these FX processors can get very toasty!
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post #6 of 6
Hello everybody,

I think imma help you out some, first off turn all your settings back to default. Next we need to turn off all the "auto overclocking" stuff or disable it atleast ( i do suggest keeping spread spec turned on for better stability ). Then simply crank up the multiplier to 22.5 (4.5GHz) and find the CPU Voltage and set it to about 1.45V. Then you can play with the HT Link Speed and CPU/NB Freq to 2600MHz on both of them. I dont really need to crank up the DIGI VRM till you overclock it past 4.5GHz. I hope this helps.

here is my systems specs: AMD FX-8150, Corsair H100 Liquid Cooling Kit, Corsair Vengeance 4 x 4GB 1600MHz, EVGA Geforce GTX 580 (1.5GB VRAM), Rosewill 1K Watt PSU, ASUS M5A99X EVO

- Jackel1337
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