[NEED GUIDE] Intel E7500 + Gigabyte GA-EP43-ES3G

[xeveN]

i want to overclock my pc, cos some of my friends said my computer could go faster..

well, i dunno how... it would be great if someone wants help me with a totally-newbie guide ?

here's my spec if someone wants to help,

Motherboard : Gigabyte GA-EP43-ES3G [BIOS F10]
Processor : Intel Core 2 Duo E7500 @ 2.93GHz
Heatsink : Cooler Master Hyper 212+ (1 Fan)
RAM : CORSAIR TWIN2X2048-6400 (2x1 GB)
VGA : Gigabyte NVIDIA GTS250 1GB 256Bit GDDR3
Power Supply : Corsair 650HX (650W)
Casing : Cooler Master CM 690 NVIDIA Edition
Extra Cooler Casing : TOP = 2x XIGMATEX XLF-F1455 (Black) 140mm Led Fan
BOTTOM = 1x XIGMATEX XLF-F1455 (Black) 140mm Led Fan

and here's my BIOS :

MB Intelligent Tweaker (M.I.T)

Robust Graphics Booster : .................................. [Auto]
CPU Clock Ratio : .............................................. [11x]
Fine CPU Clock Ratio : ....................................... [+0]
CPU Frequency : .............................................. [2.93GHz] (266x11)

------ Clock Chip Control -------
>>>>>    Standard Clock Control
CPU Host Clock Control : ................................... [Disabled]
CPU Host Frequency : ....................................... 266
PCI Express Frequency (Mhz) : ........................... [Auto]

------- DRAM Performance Control -------
Performance Enhance : .................................... [Turbo]
(G)MCH Frequency Latch : ................................ [Auto]
System Memory Multiplier (SPD) : ....................... [Auto]
Memory Frequency (Mhz) : ................................ [Auto]
DRAM Timing Selectable (SPD)............................ [Auto]
>>>>>>  Standard Timing Control
CAS Latency Time............................. 5 ........... [Auto] 
tRCD............................................... 5 ........... [Auto]
tRP................................................. 5 ........... [Auto
tRAS............................................... 18 ........... [Auto]
>>>>>>> Advanced Timing Control
Advanced Timing Control..................... [Press Enter]      PS :*ALL AUTO*
--------------- Mother Board Voltage Control -----------
Voltage Types : Normal Current
-------------------------------------------------------
>>> CPU
CPU Vcore........................................ 1.27500V .......... [Auto]
CPU Termination................................ 1.200V .............. [Auto]
CPU Reference.................................. 0.805V .............. [Auto]
>>> MCH/ICH
MCH Core........................................ 1.100V .............. [Auto]
>>> DRAM
DRAM Voltage................................... 1.800V ........... [Auto]

what should i change in this BIOS for the best performance.. im a daily gaming + rendering user...

i want to reach 4.0+GHz if possible... thanks bfre guys...