Overclocking GPU on Dell XPS M1730

Following is my Dell XPS M1730 Laptop configuration.

• Intel Core 2 Duo T8300 processor at 2.2GHz
  
• 17-inch UltraSharp widescreen (1920x1200) display with TrueLife technology (wide viewing angle, 7ms response gray to gray, 260 nits typical brightness)
  
• 4GB dual channel DDR2 SDRAM at 667MHz;
  
• NVIDIA SLI technology with dual NVIDIA GeForce Go 8700M GT GPUs with 256MB
  
• Optional AGEIA PhysX 100M processor
  
• 200GB 7,200 RPM hard disc drive
  
• 8x DVD+/-RW
  
• Intel Pro/Wireless 3945 802.11 a/b/g Wireless with WiFi Catcher, Bluetooth version 2.0+
  
• 2.0 MP built-in webcam with dual digital array microphones
  
• Logitech GamePanel LCD panel embedded above keyboard
  
• 4 USB 2.0, Dual-link DVI-I (support for 30-inch displays), IEEE 1394a, S-video with component, composite, S/PDIF support, 8-in-1 card reader, HDMI via DVI adapter, Consumer IR, dual headphones, microphone (stereo line-in) and support for 5.1 audio out
  
• Choice of Microsoft Windows Vista Premium or Windows XP Professional
  
• ExpressCard Consumer IR Travel Remote Control
  
• 80WHr Lithium-Ion battery

Can I overclock this Rig, I know this is possible please help me Overclocking it.

The PhysX won't really make much difference in games. Only in benchmarks such as Vantage. Etc. That laptop is quick enough anyway.

Optional Upgrades

• Intel Core 2 Duo T9500 (2.4GHz) or Intel Extreme Edition Core 2 Duo X9000 processor (2.8GHz) with support for overclocking to 3.2GHz (Bin+2)
  
• Optional 64GB solid state disc (SSD) drives or traditional platter hard drives, some supporting dual hard drive and RAID array configurations
  
• Optional Blu-ray Disc Drive