from intels site
What is the maximum amount of video memory my computer can use?
Maximum Graphics Memory**
IntelÂ® Graphics Controller Microsoft Windows* XP and 2000 Microsoft Windows Vista*
Mobile IntelÂ® 4 Series Express Chipset Family 1 GB** 2 GB**
IntelÂ® G41, G43, G45, Q43, and Q45 Express Chipsets 1 GB** 2 GB**
IntelÂ® G35 Express Chipsets 384 MB** 358 MB**
IntelÂ® G31, G33, Q33, and Q35 Express Chipsets 384 MB** 287 MB**
Mobile IntelÂ® GL960 and GM965 Express Chipsets 384 MB** 358 MB**
IntelÂ® G965 Express Chipsets 384 MB** 358 MB**
IntelÂ® Q963 and Q965 Express Chipsets 256 MB** 256 MB**
IntelÂ® 946GZ Express Chipsets 256 MB** 256 MB**
Mobile IntelÂ® 945GM Express Chipset Family 224 MB** 256 MB**
IntelÂ® 945G Express Chipset Family 224 MB** 256 MB**
**Note: The actual amount of maximum graphics memory on your computer may be less than the listed amounts as it greatly depends on your computer model's specific configuration. Configuration factors may include but are not limited to:
* The graphics memory allocation method set by your computer manufacturer
* Amount of system memory available
* Amount of pre-allocated memory
* Operating system.
The best place for obtaining information about your computer's specific configuration is from your computer manufacturer. Your computer manufacturer may have altered features, incorporated customizations, or made other changes that may limit the maximum graphics memory amount possible for your computer.http://www.intel.com/support/graphics/sb/CS-029090.htm
so this suggests that the max in XP is 224mb, (same as MSI wind) so its all down to the lenovo BIOS.