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I just got a new ASRock 990FX Extreme4 motherboard and I've been trying to get a decent overclock on my FX-8120. If anyone is using an ASRock board for overclocking I'd appreciate any advice or tips on how to get a good overclock using this board. How high have you been able to overclock an 8-core cpu?

I've been having trouble with the memory speeds when overclocking. If I overclock to 4.0Ghz at 1.35 volts using the multiplier everything is stable but the automatic memory speed setting in the bios downclocks my 1333mhz ram to 800mhz and if I try to manually set the memory speed it won't post. Any ideas how to fix this? Do I need to change the north-bridge frequency or voltage? Any help would be appreciated.
Research computer
(10 items)
 
Backup Rig
(8 items)
 
 
CPUMotherboardGraphicsRAM
FX-8120 Gigabyte 970A-D3 Sapphire Radeon HD 6570 Crucial Ballistix 
Hard DriveCoolingOSCase
Seagate Barracuda 1TB Coolermaster Hyper 212 Evo Windows 7 Coolermaster Elite 430 
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Research computer
(10 items)
 
Backup Rig
(8 items)
 
 
CPUMotherboardGraphicsRAM
FX-8120 Gigabyte 970A-D3 Sapphire Radeon HD 6570 Crucial Ballistix 
Hard DriveCoolingOSCase
Seagate Barracuda 1TB Coolermaster Hyper 212 Evo Windows 7 Coolermaster Elite 430 
  hide details  
Reply