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Overclock FX-8320 on a Gigabyte 78LMT-usb3 with corcair H55

post #1 of 4
Thread Starter 
He guy's
I am new here. I want to overclock my FX-8320 he is cooled by a corsair H55 in puss pull
. What are te best stable settings? i don't know much about overclocking.. Thanks Picture of my rig :
post #2 of 4
Welcome to OCN!

The VRMs on the 78LMT will be limited to ~140-150W, and that's with proper air-flow over the VRM heatsink. Assuming a really really nice FX-8320 you'll be power limited to ~4.5ghz on a good day. (This would be pushing the limits of the VRMs and should only be used as a 24/7 OC on this board if you rarely have highly parallel workloads). I highly recommend tucking that fan-wire back away from the VRM heatsink, and mounting one of your push/pull fans on the OUTSIDE of the case so that the turbulent air-pickup for the rad is pulled over the VRM heat-sink. (currently, it looks like your VRM sink is hiding under the side of the fan. This could be problematic)



Note: Cooling the VRMs is just as important as cooling the CPU to maintain stable clean voltage. When the VRMs overheat instability or thermal protection will kick in (shutdown or low-power-state throttling).

Stable overclocks are not universal. They vary from chip to chip, board to board, and cooling to cooling solution. There are "tolerances" in everything and the difference between stable and not stable can be smaller than the tolerances in the voltage readings, so you'll have to work your way to your own stable overclock.

Setting a higher clock is the easy part of an overclock. Achieving stable efficient overclocks requires first getting a grip on the voltage regulation on your motherboard. Learn how to get stable voltage from the VRMs, then find low voltage stability, THEN work your way up the ladder to a higher clock speed.


Get CPU-Z, HWinfo, and some stress testing software so you can observe voltages and temperatures. Pencil/paper are best to keep track of what you are doing and the results of various testing as you work towards an overclock.

learn how to clear CMOS and be ready for the possibility of having to do this to "fix" a setting too unstable to recover from. Be ready to rest all BIOS settings back to the way the machine needs to work correctly (boot order, time, any particular special capabilities you have enabled or disabled to be compatible with something)

Backup any important data, there's always a minor chance you could corrupt the OS install and have to start over.

  • Disable Turbo Core
  • Disable APM
  • [optional: turn off power saving features like cool-n-quiet, C states, etc]
  • [optional: turn of CPU fan control, run full blast while testing]
  • Set CPU voltage control to manual, lock in a fixed setting of 1.400V.
  • [optional: Set CPU-NB voltage control to manual, lock in a fixed setting of 1.20-1.25V]
  • Set RAM speeds conservatively for now (either lower speeds or looser than rated timings)
  • Adjust CPU multiplier to 20X (=4ghz).
  • With the voltage and clock speed locked to a fixed setting, observe and record CPU voltage regulation from idle to load with every LLC setting the board has (load-line-calibration). If your board is like other GigaByte boards, you'll have a bunch of very ambiguous LLC settings available in an order that makes no sense (Auto, Normal, Low, Medium Extreme, Standard etc). Test them all.
  • Select the LLC setting with the narrowest voltage variance from idle to load, and the least amount of voltage variation under load, but still erring on the side of drooping rather than rising when a load is initiated. (a droop from 1.40 to 1.38V would be preferable to a rise from 1.40V to 1.42V when transitioning from idle to load).
  • [Note: 4.0GHZ@1.40V will represent a load of ~150W on the VRMs, and will stress the VRMs near the limits. Any chance of overclocking beyond 4.0ghz will depend on finding under-volted stability on your chip, as any clock speed increase will increase power consumption proportionally. Reduced voltage will decrease power logarithmically. Finding the most stable LLC setting at this speed/voltage will also likely be the best LLC setting for your maximum practical overclock]
  • Begin under-volting the CPU ~0.025V at a time with the chip still locked at 4.0ghz.
  • When it will no longer boot, raise voltage 1 notch (0.00625V) at a time until it will boot and run a short load test with stability.
  • Overclock with the CPU multiplier, 100mhz at a time, adding 0.025V per 100mhz. Load test at each step to check on VRM temps, CPU temps (stay below ~60C core temps), and voltage stability (you can check on VRM temps by touch (rough estimate, careful, may burn! direct skin contact @60C for 5 seconds on highly conductive material = 1st degree burn), IR thermometer, or temp probe, max temps at the MOSFETS should not exceed 90C on most motherboards, lower is better for voltage stability, efficiency, and long-term reliability, so the surface of the top of the sink should be quite a bit lower than this. Use good judgement and err on the side of conservative when in doubt. Avoid magic smoke release wink.gif


Higher voltage and lower temps = stability
Higher voltage causes higher temps (viscous cycle)
Since you will be power limited, every 100mhz over 4ghz will require a cut of ~0.01875V (from the 1.40V starting point) to stay within power limitations of the board. YMMV. (you could use this inverted relationship as a road-map to OC on until you run out of stability then fine tune from there if you want).


After finding a stable overclock that is within the limits of the VRMs and CPU cooling, you can fine tune the overclock for efficiency and performance with offset voltage, low power states enabled, fine tuned RAM speeds/timings, NB overclock, etc.
     
CPUMotherboardGraphicsRAM
FX-8350 990X EVO R2.0 Sparkle GTX460 768MB ballistix tactical 2 x 8GB 
Hard DriveHard DriveOptical DriveCooling
Toshiiba THNSNH 256GB Enterprise RE3 1TB Asus BD combo drive Artic A30 
OSMonitorMonitorMonitor
Manjaro Linux Samsung 21.5" LCD E2009WFP E2009WFP 
PowerCase
Seasonic G 550W Modular Fractal Design Core 3500 
CPUMotherboardGraphicsRAM
FX-6300, 4.7 GHZ@1.43V GA-970A-UD3P GTX 460 768MB Mixed DIMMs. 2x4GB + 2x8GB @ 1600-8-8-8 
Hard DriveHard DriveHard DriveHard Drive
Toshiba THNSNH 19nm 256GB 1TB Spinpoint F3 WD RE3 1TB WD RE3 1TB 
Optical DriveCoolingOSOS
yes CM Seidon 120V SolydK OpenSuse 13.1 
OSOSMonitorMonitor
Linux Mint 9-32 bit // Linux Mint 17-64 bit  Manjaro Xfce Samsung 21.5" HannsG 21.5" sideways! 
KeyboardPowerCaseMouse
Sticky ATNG Rosewill Green 630W NZXT Gamma Basic Microsoft corded 
CPUMotherboardGraphicsRAM
A10-6800k 4.8GHZ @ 1.375V, 1.2GHZ iGPU Gigabyte GA-F2A85XN-WIFI HD8670D Ripjaws 
Hard DriveOptical DriveCoolingOS
Seagate ST1000DM003 Asus BC-12B1ST/BLK/B/AS Zalman CNPS5X Linux Mint 15 
MonitorKeyboardPowerCase
LG IPS224V-PN Logitec K360 FSP 400W Aurum S 80+ gold Prodigy 
Mouse
logitec M235 
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CPUMotherboardGraphicsRAM
FX-8350 990X EVO R2.0 Sparkle GTX460 768MB ballistix tactical 2 x 8GB 
Hard DriveHard DriveOptical DriveCooling
Toshiiba THNSNH 256GB Enterprise RE3 1TB Asus BD combo drive Artic A30 
OSMonitorMonitorMonitor
Manjaro Linux Samsung 21.5" LCD E2009WFP E2009WFP 
PowerCase
Seasonic G 550W Modular Fractal Design Core 3500 
CPUMotherboardGraphicsRAM
FX-6300, 4.7 GHZ@1.43V GA-970A-UD3P GTX 460 768MB Mixed DIMMs. 2x4GB + 2x8GB @ 1600-8-8-8 
Hard DriveHard DriveHard DriveHard Drive
Toshiba THNSNH 19nm 256GB 1TB Spinpoint F3 WD RE3 1TB WD RE3 1TB 
Optical DriveCoolingOSOS
yes CM Seidon 120V SolydK OpenSuse 13.1 
OSOSMonitorMonitor
Linux Mint 9-32 bit // Linux Mint 17-64 bit  Manjaro Xfce Samsung 21.5" HannsG 21.5" sideways! 
KeyboardPowerCaseMouse
Sticky ATNG Rosewill Green 630W NZXT Gamma Basic Microsoft corded 
CPUMotherboardGraphicsRAM
A10-6800k 4.8GHZ @ 1.375V, 1.2GHZ iGPU Gigabyte GA-F2A85XN-WIFI HD8670D Ripjaws 
Hard DriveOptical DriveCoolingOS
Seagate ST1000DM003 Asus BC-12B1ST/BLK/B/AS Zalman CNPS5X Linux Mint 15 
MonitorKeyboardPowerCase
LG IPS224V-PN Logitec K360 FSP 400W Aurum S 80+ gold Prodigy 
Mouse
logitec M235 
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post #3 of 4
MDOCOD how did you manage to put a 80mm fan over the vrm heatsink?
Jay
(13 items)
 
  
CPUMotherboardGraphicsRAM
FX 8350 4.4Ghz at 1.36v GA 78LMT USB3 Rev 5.0 Sapphire R9 285 OC 16GB Kingston Savage Ram 
Hard DriveHard DriveCoolingOS
1TB Western Digital 500GB Seagate Barracuda Noctua NH-D15S Windows 8.1 
MonitorPowerMouseMouse Pad
Asus MG279Q Fressync OCZ ZS 650 Watt PSU Dragonwar ELE-G9 Dragonwar 
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Jay
(13 items)
 
  
CPUMotherboardGraphicsRAM
FX 8350 4.4Ghz at 1.36v GA 78LMT USB3 Rev 5.0 Sapphire R9 285 OC 16GB Kingston Savage Ram 
Hard DriveHard DriveCoolingOS
1TB Western Digital 500GB Seagate Barracuda Noctua NH-D15S Windows 8.1 
MonitorPowerMouseMouse Pad
Asus MG279Q Fressync OCZ ZS 650 Watt PSU Dragonwar ELE-G9 Dragonwar 
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post #4 of 4
Look closely, it's just hanging there on some stiff black wire. I have one stiff black wire looped around the rad-fan-bolt (hidden, upper left) corner, another strung across to the HD cages, and the 3rd point of retention is, (drum roll), the fan-power wires twisted up around the water hose. (yes, it's very sophisticated).

I've actually since removed it. No longer having VRM heat problems since changing the fan configuration. I was experimenting with the radiator configured intake (shown that way in pic). It was blowing hot air right on the VRM sink (as you likely have observed, air doesn't flow directly forward from a computer fan, more like at a 45 degree angle out in all directions). I was trying to create enough turbulence there with the 70mm fan to solve the problem. No go...

Right now I actually have all 5 case fans blowing INTO the case (even the top ones), with only the RAD fan exhausting. No more VRM temp problems and dropped 4C on the CPU.
     
CPUMotherboardGraphicsRAM
FX-8350 990X EVO R2.0 Sparkle GTX460 768MB ballistix tactical 2 x 8GB 
Hard DriveHard DriveOptical DriveCooling
Toshiiba THNSNH 256GB Enterprise RE3 1TB Asus BD combo drive Artic A30 
OSMonitorMonitorMonitor
Manjaro Linux Samsung 21.5" LCD E2009WFP E2009WFP 
PowerCase
Seasonic G 550W Modular Fractal Design Core 3500 
CPUMotherboardGraphicsRAM
FX-6300, 4.7 GHZ@1.43V GA-970A-UD3P GTX 460 768MB Mixed DIMMs. 2x4GB + 2x8GB @ 1600-8-8-8 
Hard DriveHard DriveHard DriveHard Drive
Toshiba THNSNH 19nm 256GB 1TB Spinpoint F3 WD RE3 1TB WD RE3 1TB 
Optical DriveCoolingOSOS
yes CM Seidon 120V SolydK OpenSuse 13.1 
OSOSMonitorMonitor
Linux Mint 9-32 bit // Linux Mint 17-64 bit  Manjaro Xfce Samsung 21.5" HannsG 21.5" sideways! 
KeyboardPowerCaseMouse
Sticky ATNG Rosewill Green 630W NZXT Gamma Basic Microsoft corded 
CPUMotherboardGraphicsRAM
A10-6800k 4.8GHZ @ 1.375V, 1.2GHZ iGPU Gigabyte GA-F2A85XN-WIFI HD8670D Ripjaws 
Hard DriveOptical DriveCoolingOS
Seagate ST1000DM003 Asus BC-12B1ST/BLK/B/AS Zalman CNPS5X Linux Mint 15 
MonitorKeyboardPowerCase
LG IPS224V-PN Logitec K360 FSP 400W Aurum S 80+ gold Prodigy 
Mouse
logitec M235 
  hide details  
Reply
     
CPUMotherboardGraphicsRAM
FX-8350 990X EVO R2.0 Sparkle GTX460 768MB ballistix tactical 2 x 8GB 
Hard DriveHard DriveOptical DriveCooling
Toshiiba THNSNH 256GB Enterprise RE3 1TB Asus BD combo drive Artic A30 
OSMonitorMonitorMonitor
Manjaro Linux Samsung 21.5" LCD E2009WFP E2009WFP 
PowerCase
Seasonic G 550W Modular Fractal Design Core 3500 
CPUMotherboardGraphicsRAM
FX-6300, 4.7 GHZ@1.43V GA-970A-UD3P GTX 460 768MB Mixed DIMMs. 2x4GB + 2x8GB @ 1600-8-8-8 
Hard DriveHard DriveHard DriveHard Drive
Toshiba THNSNH 19nm 256GB 1TB Spinpoint F3 WD RE3 1TB WD RE3 1TB 
Optical DriveCoolingOSOS
yes CM Seidon 120V SolydK OpenSuse 13.1 
OSOSMonitorMonitor
Linux Mint 9-32 bit // Linux Mint 17-64 bit  Manjaro Xfce Samsung 21.5" HannsG 21.5" sideways! 
KeyboardPowerCaseMouse
Sticky ATNG Rosewill Green 630W NZXT Gamma Basic Microsoft corded 
CPUMotherboardGraphicsRAM
A10-6800k 4.8GHZ @ 1.375V, 1.2GHZ iGPU Gigabyte GA-F2A85XN-WIFI HD8670D Ripjaws 
Hard DriveOptical DriveCoolingOS
Seagate ST1000DM003 Asus BC-12B1ST/BLK/B/AS Zalman CNPS5X Linux Mint 15 
MonitorKeyboardPowerCase
LG IPS224V-PN Logitec K360 FSP 400W Aurum S 80+ gold Prodigy 
Mouse
logitec M235 
  hide details  
Reply
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