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AMD FX-8320 with Gigabyte 990FXA-UD3 Ver 3.0

post #1 of 11
Thread Starter 
Hi,

I have looked at some of the guides to figure out the best way to overclock my machine. I am not an extreme gamer but would like to see what these setups can do as far as pushing the extremes.

Here is my setup:

AMD FX-8320 8 core cpu
Gigabyte 990fxa-ud3 Version 3 with FB bios
Ultra 600 Watt power supply
Gigabyte 6670 HD GPU with 1 Gb of DDR3
20 Gb of RAM with 16 Gb of Corsair Vengeance 1600 MHz CAS 10 and 4 Gb of GSkill 1600 MHz CAS 9
Cooler Master CM 212 Hyper Plus air cooler with push pull fans (on both ends)
Kingston Hyperx 3K 128 Gb SSD as my only drive (for the moment)

I bought this combo and have been playing with some overclocking. The fx8320 seems to be stable at default clock rates and I have not experienced (knock on wood) any strange hangups or BSODs. I played with some overclocking by pushing up the multiplier to 22 and increasing the Vcore to about +0.050. On this mobo, I can go in increments of 0.025 (up and down). It has the NORMAL and AUTO settings for Vcore and multiplier settings.

Normally, when I bumped up the multiplier to 22 and turned off turbo boost, it seemed very stable at 4400 MHz and I was happy. I made minor tweaks to turn off Cool n quiet and disabled HPC. That said, I was blasting Prime 95 on this machine and let it rip for several hours every day for about 3-4 days. The temps hovered around 45-50c on full 100% load and when idle, they were down to about 12-15c. Everything was stable and I found the machine responsive to casual browsing and some other things while Prime 95 was running full bore.

However, I notice when the temperature on the CPU reaches about 38-39c, the speed gets knocked down to 2913 MHz for a microsecond and then its quickly back up to 4420 MHz. At 4420MHz, it stays for a 5-10 second and then takes a quick dive to 2913 MHz and comes straight back up to 4.4 GHz. On the UD3, I have disabled Core Performance Boost (which I believe is a turbo setting that throttles the CPU at load/no load). I don't understand why the CPU takes a momentary dive to 2913 MHz (only this frequency) and then comes right back up. I see the temps are not that bad and the cooling seems adequate considering that the temps at full load is only about 45-50c max.

Can owners of this combination shed some light on why I could be having this momentary dive down and up? Is the voltage sufficient for this? Do I need to change some other setting that I am not aware off? or should I be increasing the voltage up a notch? The Vcore seems to bounce around 1.368-1.476 v because of my Vcore setting (set at +0.050v).

I have read some conflicting comments on UD3 being the source of the problem. Any help is highly appreciated.

thanks

tommy
post #2 of 11
the ud3 is the problem, well the bios is anyway. To oc that board, you will need to
turn off all power saving features. including hpc mode.
set the fsb or multiplyer you want reboot to login screen or desk top.
then restart and turn hpc mode on. Stress test.
if you goto change any setting in the bios turn off hpc mode, reboot. then go back into the bios and make changes. load to user screen or desk top, restart turn hpc mode on.

In simple, to stop the multiplyer from dropping turn hpc mode on. once on, only thing that can be change in bios is fsb or the pc wont boot. you have to diable hpc, make change , reboot, then turn it back on.

you wont get any throttling till you hit around 64c with hpc mode enabled.
Edited by noobdown - 2/26/13 at 11:46am
post #3 of 11
Thread Starter 
u da man!

Thanks Noobdown, appreciate your help. I did what you said about HPC mode. Initially, with the multiplier set to 22 and the cpu speed at 4400 MHz, I enabled HPC mode and BAM, Prime 95 said hardware failure on its first iteration of the test. I disabled HPC mode and tried Prime95 at the same 4400 MHz setting and even this time (HPC mode disabled), it said hardware failure on the first iteration of the stress test and stopped the worker threads.

Then I reflashed the UEFI bios and with HPC disabled, I changed the multiplier to 21 (4200 MHz). Ran Prime95 and there were no errors. I went back into the bios and turned HPC mode to enable. Running Prime95 with 4200 MHz and HPC mode enabled. No errors so far and temps are between 47-50c. The core speed is solid at 4219 MHz. I guess without further tweaking the Vcore and other settings, this is probably the most stable to be at. Thank you for your help, appreciated.

t
post #4 of 11
Did you get your ram running at 1600?
Intel Killer
(14 items)
 
  
CPUMotherboardGraphicsRAM
AMD 8320 4.4ghz Gigabyte 990fx XFX R9 290 (1100/1250) 8GB DDR3 1866 
Hard DriveCoolingOSMonitor
750GB Momentus XT Corsair H80i Windows 8 3x 23" 1080p 
KeyboardPower
Logitech Mk 710 OCZ 1000 watts 
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Intel Killer
(14 items)
 
  
CPUMotherboardGraphicsRAM
AMD 8320 4.4ghz Gigabyte 990fx XFX R9 290 (1100/1250) 8GB DDR3 1866 
Hard DriveCoolingOSMonitor
750GB Momentus XT Corsair H80i Windows 8 3x 23" 1080p 
KeyboardPower
Logitech Mk 710 OCZ 1000 watts 
  hide details  
Reply
post #5 of 11
Thread Starter 
Yep, its dual channel memory and it shows that each channel is running at a freq of 803.7 MHz. The bios also recognizes it at the same speed (meaning 1607.75 etc.).

t
post #6 of 11
I have the same setup as you and no matter what I do I cant get the ram to run at 1600. Motherboard keeps setting it to 1333.
Intel Killer
(14 items)
 
  
CPUMotherboardGraphicsRAM
AMD 8320 4.4ghz Gigabyte 990fx XFX R9 290 (1100/1250) 8GB DDR3 1866 
Hard DriveCoolingOSMonitor
750GB Momentus XT Corsair H80i Windows 8 3x 23" 1080p 
KeyboardPower
Logitech Mk 710 OCZ 1000 watts 
  hide details  
Reply
Intel Killer
(14 items)
 
  
CPUMotherboardGraphicsRAM
AMD 8320 4.4ghz Gigabyte 990fx XFX R9 290 (1100/1250) 8GB DDR3 1866 
Hard DriveCoolingOSMonitor
750GB Momentus XT Corsair H80i Windows 8 3x 23" 1080p 
KeyboardPower
Logitech Mk 710 OCZ 1000 watts 
  hide details  
Reply
post #7 of 11
Thread Starter 
Have you tried turning on XMP? The FB bios has version 1.3 and it may help your case to see whether xmp recognizes it correctly. I built another system, core-i7 3930k with a MSI mobo, that had the same issue. No matter what, it would not recognize the right speed of the memory. I was slightly reluctant to turn on XMP for reasons that the board itself may become somewhat unstable. Those fears were ill found and XMP successfully recognized the memory at 1866 MHz and it continues to perform fine (knock on wood). XMP may help. Its disabled by default, but you can enable it to see whether it recognizes the memory at the right speed. Some memory may not ideally live up to their potential either due to quality of chips or the manufacturing processes. Just my 2 cents.

good luck

t
post #8 of 11
Where do I find xmp?
Intel Killer
(14 items)
 
  
CPUMotherboardGraphicsRAM
AMD 8320 4.4ghz Gigabyte 990fx XFX R9 290 (1100/1250) 8GB DDR3 1866 
Hard DriveCoolingOSMonitor
750GB Momentus XT Corsair H80i Windows 8 3x 23" 1080p 
KeyboardPower
Logitech Mk 710 OCZ 1000 watts 
  hide details  
Reply
Intel Killer
(14 items)
 
  
CPUMotherboardGraphicsRAM
AMD 8320 4.4ghz Gigabyte 990fx XFX R9 290 (1100/1250) 8GB DDR3 1866 
Hard DriveCoolingOSMonitor
750GB Momentus XT Corsair H80i Windows 8 3x 23" 1080p 
KeyboardPower
Logitech Mk 710 OCZ 1000 watts 
  hide details  
Reply
post #9 of 11
Fixed it. I had to change the timings to cl10.
Intel Killer
(14 items)
 
  
CPUMotherboardGraphicsRAM
AMD 8320 4.4ghz Gigabyte 990fx XFX R9 290 (1100/1250) 8GB DDR3 1866 
Hard DriveCoolingOSMonitor
750GB Momentus XT Corsair H80i Windows 8 3x 23" 1080p 
KeyboardPower
Logitech Mk 710 OCZ 1000 watts 
  hide details  
Reply
Intel Killer
(14 items)
 
  
CPUMotherboardGraphicsRAM
AMD 8320 4.4ghz Gigabyte 990fx XFX R9 290 (1100/1250) 8GB DDR3 1866 
Hard DriveCoolingOSMonitor
750GB Momentus XT Corsair H80i Windows 8 3x 23" 1080p 
KeyboardPower
Logitech Mk 710 OCZ 1000 watts 
  hide details  
Reply
post #10 of 11
I did find a workaround for the initial problem of this thread on another forum regarding another AM3+ board.
It seems that if you start AMD Overdrive -> Enable Core Boost -> Ok -> Disable Core Boost -> OK -> Check Multi (e.g. 22x for 4400 Mhz) -> Apply
It does the same: it will stop the throttling.
Still, I have Noctua NH-D14 / 27 deg. Celsius ambient and cannot run stable OCCT @ 4.5 Ghz (it goes to ~1.5 V in full load and hits 64 deg. in 2-3 minutes). Any ideas on how to reach stability? Can it be a PSU problem, I have a 5 years old 560W Sirtec active PFC 3x 12V rail 14A /23A /15A.
Edited by sabinus - 4/20/13 at 3:51am
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