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FX-4100 Overclocking/undervolting

post #1 of 4
Thread Starter 
First off, I'd like to say hello to everyone in the overclock.net community, as this is my first post! biggrin.gif

I have had an FX-4100 for about a year and a half now, and I have decided to start overclocking this little chip. At stock speed, I undervolted the CPU to just above a volt (1.1250 specifically) via AMD Overdrive. I used the included stability test and Benchmark utility, and while it was undervolted, I got a benchmark score of 6217. However at stock voltage, the average score was 6172. As I inched the clock and voltage up very slowly, I noticed a very strange phenomenon.

Below are the clock/voltage adjustments I tried (keep in mind these are composite scores):

3.6GHz @ 1.1125v: 6217

3.6GHz @ 1.3750v: 6172

4.2GHz @ 1.3125v: 5810

4.2GHz @ 1.3750v: 6167

I recently bought a Gigabyte 990FXA-UD3 for the sole purpose of overclocking (very solid board!), and this is kind of bothersome. If I could get a little help on the stability issues, I'd love it. I'll post my specs below

CPU: FX-4100
Mobo: 990FXA-UD3
GPU: Sapphire 7850 1GB OC Edition
RAM: Corsair Vengeance @ 1600mhz
HDD: WD Green Drive (will be coupled with an SSD very shortly!)
PSU: Rosewill Capstone 650W
Case: Rosewill FUTURE
    
CPUMotherboardGraphicsRAM
AMD FX-4100 990FXA-UD3 AMD Radeon HD 7800 Series Corsair Vengeance 2x4GB DDR3 1600 
RAMHard DriveOptical DriveCooling
Corsair  Western Digital 500GB Green LG  Rosewill aiolos 
OSMonitorKeyboardPower
Windows 7 Sansui 19 inch Logitech K200 Rosewill Capstone 650w  
Case
Rosewill Future 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
AMD FX-4100 990FXA-UD3 AMD Radeon HD 7800 Series Corsair Vengeance 2x4GB DDR3 1600 
RAMHard DriveOptical DriveCooling
Corsair  Western Digital 500GB Green LG  Rosewill aiolos 
OSMonitorKeyboardPower
Windows 7 Sansui 19 inch Logitech K200 Rosewill Capstone 650w  
Case
Rosewill Future 
  hide details  
Reply
post #2 of 4
Could it just be normal score variance that all benchmark tests have? Actually, come to think of it, does bulldozer have automatic turboing on the cores? If so, that could explain the higher benchmark scores with a lower voltage. There is less voltage running through the chip and therefore, less heat. Less heat means the cores can turbo at higher frequencies for longer during the test.
The Sleeper
(10 items)
 
 
Sony Xperia Z3
(7 items)
 
CPUMotherboardGraphicsGraphics
AMD FX 8320  Asus Sabertooth 990FX R2.0 MSI Radeon 7950 MSI Radeon 7950 
RAMHard DriveCoolingOS
8GB Crucial Ballistix Sport 1600mhz Samsung 470 SSD Corsair H80i Windows 7 64 Bit Home Premium 
PowerCase
Corsair HX850 Coolermaster HAF 932 
CPUMotherboardGraphicsRAM
Intel SU7300 Core2Duo 1.6 Ghz Alienware OEM Nvidia 335m 8 GB PNY memory 
Hard DriveOSMonitor
Samsing 840 SSD Windows 7 Home Premium 64-Bit Generic PNP monitor @ 75hz 
CPUGraphicsRAMHard Drive
Snapdragon 801 @ 2.5 Ghz Adreno 330 3 GB 32 GB  
CoolingOSMonitor
Blow on it Android 4.4.4 1920x1080 LCD 
  hide details  
Reply
The Sleeper
(10 items)
 
 
Sony Xperia Z3
(7 items)
 
CPUMotherboardGraphicsGraphics
AMD FX 8320  Asus Sabertooth 990FX R2.0 MSI Radeon 7950 MSI Radeon 7950 
RAMHard DriveCoolingOS
8GB Crucial Ballistix Sport 1600mhz Samsung 470 SSD Corsair H80i Windows 7 64 Bit Home Premium 
PowerCase
Corsair HX850 Coolermaster HAF 932 
CPUMotherboardGraphicsRAM
Intel SU7300 Core2Duo 1.6 Ghz Alienware OEM Nvidia 335m 8 GB PNY memory 
Hard DriveOSMonitor
Samsing 840 SSD Windows 7 Home Premium 64-Bit Generic PNP monitor @ 75hz 
CPUGraphicsRAMHard Drive
Snapdragon 801 @ 2.5 Ghz Adreno 330 3 GB 32 GB  
CoolingOSMonitor
Blow on it Android 4.4.4 1920x1080 LCD 
  hide details  
Reply
post #3 of 4
Thread Starter 
I have disabled C&Q, CPB, and all power saving/clock modifying features. It's very strange, as I leave turbo core on, I can hit 4.2, but as soon as I turn it off, it crashes immediately. However, I will begin trying out different voltages.
    
CPUMotherboardGraphicsRAM
AMD FX-4100 990FXA-UD3 AMD Radeon HD 7800 Series Corsair Vengeance 2x4GB DDR3 1600 
RAMHard DriveOptical DriveCooling
Corsair  Western Digital 500GB Green LG  Rosewill aiolos 
OSMonitorKeyboardPower
Windows 7 Sansui 19 inch Logitech K200 Rosewill Capstone 650w  
Case
Rosewill Future 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
AMD FX-4100 990FXA-UD3 AMD Radeon HD 7800 Series Corsair Vengeance 2x4GB DDR3 1600 
RAMHard DriveOptical DriveCooling
Corsair  Western Digital 500GB Green LG  Rosewill aiolos 
OSMonitorKeyboardPower
Windows 7 Sansui 19 inch Logitech K200 Rosewill Capstone 650w  
Case
Rosewill Future 
  hide details  
Reply
post #4 of 4
Quote:
Originally Posted by 4duino View Post

I have disabled C&Q, CPB, and all power saving/clock modifying features. It's very strange, as I leave turbo core on, I can hit 4.2, but as soon as I turn it off, it crashes immediately. However, I will begin trying out different voltages.

Turbo core automatically increases the voltage when it is in use so that alone may have been what was keeping you stable. I like to disable turbo so it's one less variable to keep track of.
The Sleeper
(10 items)
 
 
Sony Xperia Z3
(7 items)
 
CPUMotherboardGraphicsGraphics
AMD FX 8320  Asus Sabertooth 990FX R2.0 MSI Radeon 7950 MSI Radeon 7950 
RAMHard DriveCoolingOS
8GB Crucial Ballistix Sport 1600mhz Samsung 470 SSD Corsair H80i Windows 7 64 Bit Home Premium 
PowerCase
Corsair HX850 Coolermaster HAF 932 
CPUMotherboardGraphicsRAM
Intel SU7300 Core2Duo 1.6 Ghz Alienware OEM Nvidia 335m 8 GB PNY memory 
Hard DriveOSMonitor
Samsing 840 SSD Windows 7 Home Premium 64-Bit Generic PNP monitor @ 75hz 
CPUGraphicsRAMHard Drive
Snapdragon 801 @ 2.5 Ghz Adreno 330 3 GB 32 GB  
CoolingOSMonitor
Blow on it Android 4.4.4 1920x1080 LCD 
  hide details  
Reply
The Sleeper
(10 items)
 
 
Sony Xperia Z3
(7 items)
 
CPUMotherboardGraphicsGraphics
AMD FX 8320  Asus Sabertooth 990FX R2.0 MSI Radeon 7950 MSI Radeon 7950 
RAMHard DriveCoolingOS
8GB Crucial Ballistix Sport 1600mhz Samsung 470 SSD Corsair H80i Windows 7 64 Bit Home Premium 
PowerCase
Corsair HX850 Coolermaster HAF 932 
CPUMotherboardGraphicsRAM
Intel SU7300 Core2Duo 1.6 Ghz Alienware OEM Nvidia 335m 8 GB PNY memory 
Hard DriveOSMonitor
Samsing 840 SSD Windows 7 Home Premium 64-Bit Generic PNP monitor @ 75hz 
CPUGraphicsRAMHard Drive
Snapdragon 801 @ 2.5 Ghz Adreno 330 3 GB 32 GB  
CoolingOSMonitor
Blow on it Android 4.4.4 1920x1080 LCD 
  hide details  
Reply
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