Help OCing 8320 on 990FXA-UD5

Craterloads · 22 May 2014 at 15:37

Hi guys, first time OCing a AMD CPU so would appreciate some guidance. Fear at current clock speeds I am bottlenecking 2 x 290s in crossfire fire (only scoring 2200 in Heaven 4.0 ). Building rig for Wolfenstein and Watch dogs so want to get it all up and running OCed before I start. Specs

FX 8320
Gigagbyte 990FXA-UD5 / Rev3 (Latest Bios)
8GB Team Extreme 2400MHz
1300w EVGA
Corsair H110 280mm Cooler

These or the 3 bios screen pages

Trying to get to at least 4.6. Had a quick play about but my OC of 4.2 jumps up and down in CPU-Z and Coretemp, switches between 4.2GHz and 2.9GHz every second on different cores?

These are the changes I have made for 4.2GHz

CPU Clock Ratio - 21
CPU Core Volage - +0.2v

CPU Performance Boost (Turbo Boost) - Disabled
Cool & Quiet - Disabled
C1E Support -Disabled
Core C6 State - Disabled

Everything else stock, why is my core speed jumping up and down?

JonSmith · 22 May 2014 at 16:25

Disable APM.

cwgk91 · 22 May 2014 at 17:07

I'd put LLC up to 130% as well as the above.

Also try playing around with the bus frequency before multiplier as that has helped a lot for my OC

Craterloads · 22 May 2014 at 18:49

JonSmith said:
Disable APM.

Cheers that fixed it.

Which ones should I re-enable once OC is set as power saving stuff is useful?

cwgk91 said:
I'd put LLC up to 130% as well as the above.

Also try playing around with the bus frequency before multiplier as that has helped a lot for my OC

Have set LLC to extreme, doesn't have % options

Craterloads · 22 May 2014 at 19:17

Are these V and temps OK? Which temps to monitor the CPU or package one?

lude1962 · 23 May 2014 at 08:03

temps are good, i use package temp as it matches AMD overdrive temps.

have you found the max freq yet?

cwgk91 · 23 May 2014 at 08:10

Id put LLC back down to ultra-high if it has that option. Extreme for me is equivalent of 150% and it over compensates for voltage - i.e. voltages end up higher than those you set it at!

Temps look good, though you may be able to reduce voltage slightly if you're lucky

Should be able to push for 4.8Ghz I would think

Craterloads · 23 May 2014 at 15:03

lude1962 said:
temps are good, i use package temp as it matches AMD overdrive temps.

have you found the max freq yet?

Cheers, tried 4.8GHz at 1.48v but a couple of cores failed on prime. Scared to put any more volts through it as still stuck in Intel volts in my mind and 1.5v on Intel chips would be crazy!

cwgk91 said:
Id put LLC back down to ultra-high if it has that option. Extreme for me is equivalent of 150% and it over compensates for voltage - i.e. voltages end up higher than those you set it at!

Temps look good, though you may be able to reduce voltage slightly if you're lucky Should be able to push for 4.8Ghz I would think

Normal / High / Ultra High LLC options, ill back down to high and see how it goes.

1.44v seems like what it needs although ive not messed with any other V which could help compensate. Happy at 4.6GHz as was just to alleviate any possible bottleneck which 4.6GHz seems to cover.

Out of interest what are the max safe V and Temps?