Overclock with Multiplier or FSB? (FX-8320)

InfernalSurge · Aug 12, 2015

Hello, I have a FX-8320 and I recently bumped my multiplier from 17.5 to 20 and achieved a stable 4GHz without changing the Vcore. If I wish to go further, should I change the multiplier or the FSB? I've heard some say changing the FSB messes up your entire system and causes stability issues, while others say that it improves single-core performance. Are these true? I'd like something around 4.3-4.5GHz. I'm using a Hyper 212 Evo and my motherboard is a Gigabyte 970A-UD3P rev 2.0. I'll list my full specs below. Thanks in advance.

CPU: AMD FX-8320
GPU: MSI R9 380 4GB
Motherboard: Gigabyte 970A-UD3P
RAM: 2x4GB G.Skill. Sniper 1866MHz
HDD: 1TB Western Digital Caviar Blue 7200 RPM
SSD: 120GB Kingston HyperX Fury
PSU: XFX TS Core Edition PRO650w
Case: Cooler Master HAF 912

Dunlop0078 · Aug 12, 2015

FSB overclocks will also change your memory clock speed, ht link speed, northbridge frequency and some other things im not sure about so it takes a lot more time and tweaking to overclock via the fsb, I have heard you get better single core performance from fsb overclocks but im not sure. I usually just use the multiplier its less hassle and i cant tell any performance difference. I used to use a combination of both fsb and multiplier overclocks but i was noticing some instability so i went back to just using the multiplier.

InfernalSurge · Aug 12, 2015

Dunlop0078 :

Thanks for the reply. Do you think it's worth going to 4.5 from 4.0 GHz? How much of a fps improvement will I see in games like GTA V? Some people say overclocking will wear down my PSU and motherboard much faster, is this true?

Dunlop0078 · Aug 12, 2015

InfernalSurge :

Im not too sure if I had to guess 7-10fps maybe more from 4.0 to 4.5 since gta v can really put a beating on the cpu. Well I have had the system in my signature at 4.7ghz for about 2 and half years or so and it still runs as good as the day I bought it. Your power supply is quite good and has plenty of power so I wouldn't worry about that, I have heard that mobo is quite good so I wouldn't worry about that either. It may shorten the life of the cpu some if you dont keep it properly cooled but you will probably upgrade long before that cpu dies.

InfernalSurge · Aug 12, 2015

Dunlop0078 :

InfernalSurge :

Im not too sure if I had to guess 7-10fps maybe more from 4.0 to 4.5 since gta v can really put a beating on the cpu. Well I have had the system in my signature at 4.7ghz for about 2 and half years or so and it still runs as good as the day I bought it. Your power supply is quite good and has plenty of power so I wouldn't worry about that, I have heard that mobo is quite good so I wouldn't worry about that either. It may shorten the life of the cpu some if you dont keep it properly cooled but you will probably upgrade long before that cpu dies.

Really appreciate the info. I'm going to try 4.2-4.4GHz for now. Regarding your last sentence, is a Hyper 212 Evo sufficient for 4.2-4.4? I know it's a budget cooler, but will it significantly shorten my processor's lifespan? Right now at 4.0GHz with stock voltage, it's maxing out at 45 degrees C after 15 minutes of Prime95 FFTs.

Dunlop0078 · Aug 12, 2015

InfernalSurge :

Dunlop0078 :

Really appreciate the info. I'm going to try 4.2-4.4GHz for now. Regarding your last sentence, is a Hyper 212 Evo sufficient for 4.2-4.4? I know it's a budget cooler, but will it significantly shorten my processor's lifespan? Right now at 4.0GHz with stock voltage, it's maxing out at 45 degrees C after 15 minutes of Prime95 FFTs.

Im at 4.7ghz with a hyper 212 evo lol probably not recommended but it works for me I must have gotten lucky in the silicon lottery or something. Yah a hyper 212 evo should be fine for 4.4ghz assuming you dont need to turn up the voltage that much to get there.

InfernalSurge · Aug 12, 2015

Dunlop0078 :

InfernalSurge :

Dunlop0078 :

Really appreciate the info. I'm going to try 4.2-4.4GHz for now. Regarding your last sentence, is a Hyper 212 Evo sufficient for 4.2-4.4? I know it's a budget cooler, but will it significantly shorten my processor's lifespan? Right now at 4.0GHz with stock voltage, it's maxing out at 45 degrees C after 15 minutes of Prime95 FFTs.

Im at 4.7ghz with a hyper 212 evo lol probably not recommended but it works for me I must have gotten lucky in the silicon lottery or something. Yah a hyper 212 evo should be fine for 4.4ghz assuming you dont need to turn up the voltage that much to get there.

Alright. One last question, how much voltage should I increase to achieve 4.2-4.4GHz? Thanks.

Dunlop0078 · Aug 12, 2015

Well thats where the whole silicon lottery thing comes in, I dont really know depends on your specific 8320. I can hit 4.4ghz at stock voltage which is 1.39v for my cpu, for me i find anything more than 1.44v is too much for the hyper 212 evo, 1.44v is still probably too high unless you keep your house very cool. I also set cpu northbridge voltage to 1.2v I find that helps with stability while not adding too much heat. Our cpu's are pretty much identical when it comes to thermals and voltages so I would expect your cpu to perform similarly, but like i said they are not all the same your cpu may overclock higher than mine with less voltage, it could be the same, or it could be worse.

InfernalSurge · Aug 13, 2015

I see, thank you very much for you help

Dunlop0078 · Aug 13, 2015

InfernalSurge :

No problem.

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