problem with SiS964 agp aperture

[tugs]

Hi, i'm just new to gentoo and am having problems getting my video card going properly.
Hardware: Winfast 760GXK8MC mobo (SiS964 agp chipset)
Radeon X1600 pro
i've tried fglrx and radeon and nothing's worked, then i noticed that my aperture size is somehow wrong.

i have it set to 128M in the BIOS, but when i do a dmesg | grep agp i get:

Linux agpgart interface v0.103
agpgart: Detected SiS chipset - id:1888
agpgart: AGP aperture is 4M @ 0xe0000000

lspci says:

00:00.0 Host bridge: Silicon Integrated Systems [SiS] 760/M760 Host (rev 03)
00:01.0 PCI bridge: Silicon Integrated Systems [SiS] SG86C202
00:02.0 ISA bridge: Silicon Integrated Systems [SiS] SiS964 [MuTIOL Media IO] (rev 36)
00:02.5 IDE interface: Silicon Integrated Systems [SiS] 5513 [IDE] (rev 01)
00:02.7 Multimedia audio controller: Silicon Integrated Systems [SiS] AC'97 Sound Controller (rev a0)
00:03.0 USB Controller: Silicon Integrated Systems [SiS] USB 1.0 Controller (rev 0f)
00:03.1 USB Controller: Silicon Integrated Systems [SiS] USB 1.0 Controller (rev 0f)
00:03.2 USB Controller: Silicon Integrated Systems [SiS] USB 1.0 Controller (rev 0f)
00:03.3 USB Controller: Silicon Integrated Systems [SiS] USB 2.0 Controller
00:04.0 Ethernet controller: Silicon Integrated Systems [SiS] SiS900 PCI Fast Ethernet (rev 91)
00:05.0 IDE interface: Silicon Integrated Systems [SiS] RAID bus controller 180 SATA/PATA [SiS] (rev 01)
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control
01:00.0 VGA compatible controller: ATI Technologies Inc RV530 [Radeon X1600]
01:00.1 Display controller: ATI Technologies Inc RV530 [Radeon X1600] (Secondary)

lsmod says:

Module Size Used by
ipv6 233348 10
usbhid 35712 0
floppy 60900 0
rtc 20520 0
sis900 28672 0
mii 13312 1 sis900
sg 40628 0
ehci_hcd 39692 0
ohci_hcd 29316 0
usbcore 129648 4 usbhid,ehci_hcd,ohci_hcd
fan 12160 0
thermal 27036 0
sis_agp 17664 1
processor 45928 1 thermal
agpgart 39624 1 sis_agp
button 16272 0

Does this all look normal?
i'm pretty convinced that the agp isn't being set up right, has anyone seen this before?

[tugs]

Seriously, does anybody have any ideas because i'm out of them.
Might it help if i used another disto? Should i just pack my things and go back to windows?