Can you overclock on a dell motherboard and can you unlock the BIOS?

Solution
Short answer: no.

Slightly longer answer: You can't unlock the BIOS, or use it to overclock, but in some cases it's possible to use something like SetFSB to overclock. However this is a dangerous method, and not recommended unless you know exactly what you are doing - it is very easy to destroy your motherboard using that method.

So basically no, you can't unlock the BIOS or overclock

Mightyena

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Short answer: no.

Slightly longer answer: You can't unlock the BIOS, or use it to overclock, but in some cases it's possible to use something like SetFSB to overclock. However this is a dangerous method, and not recommended unless you know exactly what you are doing - it is very easy to destroy your motherboard using that method.

So basically no, you can't unlock the BIOS or overclock
 
Solution

Seudral

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May 10, 2017
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I'm using the 0g254h motherboard from dell, and I still don't know if its able to overclock, would be really nice if it could since I wanna squeeze a bit more juice out of my CPU
 
OK it's an XPS 430. It has a 95W CPU limit, and runs 1333fsb. 45nm 3xxx Xeons work. The simplest solution is a Q9650 which scores 41% CPU at userbenchmark.com. It has room for a 2 slot wide GPU. It also has an X48 chipset which supports 400fsb, but OEMs can lock this out at the PLL chip. I would suggest trying a 333 to 400fsb tapemod on your existing CPU and see what happens.
Heatsinks on the VRM MOSFETs always help especially on a 3 Phase motherboard. Q9650 @ 400 fsb =3.6GHz. Other than that SetFSB or Clockgen software PLL mods would be about it. Results will be limited unless you raise CPU Voltage also by a VID pinmod. This would also be required for the 400FSB mod. T9303 cooler if you don't already have it. Avoid Radeon r9-3xx (and 285) and newer GPUs they won't display the Dell BIOS screen.