Tengo 64mb es por eso si

root@ubuntu:/home/yakuza# lspci -k
00:00.0 Host bridge: Silicon Integrated Systems [SiS] 730 Host (rev 02)
   Kernel driver in use: agpgart-sis
   Kernel modules: sis-agp
00:00.1 IDE interface: Silicon Integrated Systems [SiS] 5513 [IDE] (rev d0)
   Subsystem: Silicon Integrated Systems [SiS] SiS5513 EIDE Controller (A,B step)
   Kernel driver in use: pata_sis
00:01.0 ISA bridge: Silicon Integrated Systems [SiS] SiS85C503/5513 (LPC Bridge)
   Kernel driver in use: sis630_smbus
   Kernel modules: i2c-sis630
00:01.1 Ethernet controller: Silicon Integrated Systems [SiS] SiS900 PCI Fast Ethernet (rev 82)
   Subsystem: Silicon Integrated Systems [SiS] SiS900 10/100 Ethernet Adapter onboard [Asus P4SC-EA]
   Kernel driver in use: sis900
   Kernel modules: sis900
00:01.2 USB Controller: Silicon Integrated Systems [SiS] USB 1.1 Controller (rev 07)
   Subsystem: Silicon Integrated Systems [SiS] USB 1.1 Controller
   Kernel driver in use: ohci_hcd
00:01.3 USB Controller: Silicon Integrated Systems [SiS] USB 1.1 Controller (rev 07)
   Subsystem: Silicon Integrated Systems [SiS] Onboard USB Controller
   Kernel driver in use: ohci_hcd
00:01.4 Multimedia audio controller: Silicon Integrated Systems [SiS] SiS PCI Audio Accelerator (rev 02)
   Subsystem: Silicon Integrated Systems [SiS] SiS PCI Audio Accelerator
   Kernel driver in use: Trident4DWaveAudio
   Kernel modules: snd-trident
00:02.0 PCI bridge: Silicon Integrated Systems [SiS] Virtual PCI-to-PCI bridge (AGP)
   Kernel modules: shpchp
01:00.0 VGA compatible controller: Silicon Integrated Systems [SiS] 630/730 PCI/AGP VGA Display Adapter (rev 31)
   Subsystem: Silicon Integrated Systems [SiS] 630/730 PCI/AGP VGA Display Adapter
   Kernel driver in use: sisfb
   Kernel modules: sisfb

Ni idea tengo xD