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Overclocking an AMD system is a complex procedure & you need to know which BIOS settings need to be changed & why. Your CPU can easily do 2.5GHz but you have change all the settings I listed in my other response. When you increase the CPU frequency, all the other frequencies increase along with it...that is what you do NOT want to happen. You do NOT need to overclock the RAM, PCI-e or HT buses....they should run as close to their default speeds as possible. All you need to do is overclock the CPU. And keeping Spread Spectrum enabled can cause system instability because it causes the frequency to fluctuate.
I'm not exactly sure which motherboard you have because there is no such thing as a DFI NF4_U_SLI. I can only guess that your board is from the DFI Infinity series since the chipset is identified as an nForce4. The easiest way to find out would be to open the case & have a look. The model number is printed on the board.
If you want to overclock correctly, try these settings:
Under Advanced Chipset Features:
CPU Spread Spectrum = disabled
SATA Spread Spectrum = disabled
PCIE Spread Spectrum = disabled
Under Genie BIOS Settings > Clock & Raito Settings:
Hammer Fid Control = 230MHz (for starters)
HT Frequency = 4x
PCIE Clock = 100MHz
DRAM Configuration (Press Enter):
Memclock Index Value = 183MHz (for starters)
Under Over Voltage Settings:
AMD K8 Cool & Quiet = disabled
CPU Voltage Offset = +0.100v
The above settings will put the CPU at 2.3GHz, the RAM at 209MHz & the HT bus at 920MHz.
The next step should be 2.4GHz. To get to that, raise the Hammer Fid Control to 240MHz & lower the Memclock Index Value to 166MHz. These settings will put the CPU at 2.4GHz, the RAM at 200MHz & the HT bus at 960MHz.
If you want to shoot for 2.5GHz, leave the Memclock Index Value at 166MHz & simply raise the Hammer Fid Control to 250MHz. If you're succesful, the CPU will run at 2.5GHz, the RAM at 208MHz & the HT bus at 100MHz.
*** If these BIOS options don't jive with your BIOS settings, it's becuase I'm looking at the wrong motherboard. If that's the case, I'd need to know the correct model number so that I can download the manual.