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FX-8120 @4.2 Ghz on air...

post #1 of 23
Thread Starter 
Hi, Everyone!

This is my first post - after researching several overclocking sites, I decided to make this one my home.

I am running the FX-8120 Zambezi on an ASUS M5A99FX Pro 2.0 motherboard. Cannot get past 4.2Ghz and that is perhaps mainly related to air cooling, but nonetheless I believe it to be a respectable overclock. I've only had this setup for a few days and am still learning all the various BIOS functions. I have 8GB of Corsair Vengeance in Dual Channel. It's rated @1600 and the most I can stretch it is up to approx. 840Mhz

I am switching to the H80i water cooling unit, but I've noticed that it is not even the temps that are causing me to get stuck at 4.2Ghz. I'm running several setups at 4.2Ghz or thereabouts to determine where I get most performance. (200 x 21, 250 x 16.5, 245 x 17, etc.) I have no real issues booting with higher FSB settings so far, but have not selected anything higher than 250 at this point.

All the while, my CoolerMaster V6GT stays between 55 - 58 degrees @ 1.425 V. Not too bad for a $45 air cooler.

The system seems to crash or run unstable when I go past 4.2Ghz no matter what the settings, most of the time I can't even run prime95 as it often crashes during the OS load.

So, I am wondering - does that look like I've reached the limits of this CPU, or could I squeeze out more with water cooling? I don't think it is the ASUS board, as I have the MSI 970A-G46 as reference, the FX-8120 would not go past 4Ghz stable with MSI.

My local retailer currently has a special offer on the FX-8320 Vishera. I can return the FX-8120 and for 10 bucks I get the Vishera. Their specs are so similar, will I truly get more out of the Vishera CPU? Other than more headroom for overclocking, how big is the difference if I am running the Vishera at 4.2Ghz vs the Zambezi at 4.2Ghz?

Setup:

1. Antec 1200 case

2. 850 W PSU specifically designed for Antec 1200

3. ASUS M5A99FX Pro 2.0

4. AMD FX-8120 Zambezi

5. CoolerMaster V6GT - soon Corsair H80i

6. Radeon HD7850 2GB

Any input would be greatly appreciated.
Edited by rh pc - 4/6/13 at 12:26pm
post #2 of 23
The 8320 is worth it.

By looking at the link below, you'll see that 8320 is 5% faster than the 8150 even though the 8320 runs 0.1Ghz slower.
http://www.anandtech.com/bench/Product/434?vs=698

If you hit a wall while overclocking, try increasing your CPU voltage by a bit.
Edited by TheLAWNOOB - 4/6/13 at 3:37pm
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post #3 of 23
sorry double post
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post #4 of 23
sorry double post
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post #5 of 23
Def just get the Vishera. You should be able to go higher though regardless. I'll let the experts chime in
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post #6 of 23
you should be able to get much higher, just not sure how high on air. i got my fx-6100 up to 5GHz on water. it could be the board, it could also be the ram. vengeance isnt really good for overclocking. try setting it to 1333 instead of 1600 and increasing your fbs
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post #7 of 23
Thread Starter 
Thanks! I will lower the RAM settings to 1333Mhz. I was an Intel customer for years, so the BIOS settings are quite new and seem more intricate. What RAM would you suggest for OC'ing?

So far, the best result temp wise has been this setting:

4.1Ghz (205 x 20) VCore @ 1.36, Temps: reached 55 Celsius max. during 60 mins of prime95. But as soon as I go past 4.2Ghz I need more than 1.4V and that's when temps start to get iffy immediately.

While I will tinker with these settings a bit more, it looks as if my best choice would be water cooling and FX-8320. I've had the Corsair H70 for my Intel system. What other water cooling kits besides Corsair are good? My true goal here is to stretch the FX-8120/8320 as far as possible. While it always depends on individual parts in terms of how well they overclock, 4.5Ghz for the FX-8120 and 4.7Ghz for the FX-8320 seem to be rather the norm from what I have seen.
post #8 of 23
custom water would be the best, maybe give the xspc kits a look. you can also increase the voltage to your ram a bit. usually 0.15 volts is safe.
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post #9 of 23
Thread Starter 
Thanks, XSPC has great kits indeed. Any particular RAM 1600 or 1866 that is great for overclocking?
post #10 of 23
samsung wonder ram is great but it seems to be harder and harder to find. i hear the crucial ballistix lp is just about as good though. there are lots of good ram for overclocking, just check some reviews one here of different kinds.
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