Господа, у кого есть 6800GT, но только не от ASUS.
Можете сюда запостить из RivaTuner информацию из Graphic subsystem diagmostic report следующего типа?

$ffffffffff Display adapter information
$ffffffffff ---------------------------------------------------
$0000000000 Description : NVIDIA GeForce 6800 GT
$0000000001 Vendor ID : 10de (NVIDIA)
$0000000002 Device ID : 0045
$0000000003 Location : bus 1, device 0, function 0
$0000000004 Bus type : AGP revision 3.0
$0000000005 AGP status : enabled
$0000000006 AGP rate : 4x 8x supported, 8x selected
$0000000007 AGP SBA : hardwired, enabled
$0000000008 AGP FW : supported, enabled
$0000000009 Base address 0 : f8000000 (memory range)
$000000000a Base address 1 : e0000000 (memory range)
$000000000b Base address 2 : f9000000 (memory range)
$000000000c Base address 3 : none
$000000000d Base address 4 : none
$000000000e Base address 5 : none
$ffffffffff ---------------------------------------------------
$ffffffffff NVIDIA specific display adapter information
$ffffffffff ---------------------------------------------------
$0100000000 Graphics core : NV40 revision A1 (16x1,6vp)
$0100000001 Hardwired ID : 0041 (ROM strapped to 0045)
$0100000002 Memory bus : 256-bit
$0100000003 Memory type : DDR (RAM configuration 07)
$0100000004 Memory amount : 262144KB
$0100000005 Core clock : 351.000MHz
$0100000006 Memory clock : 501.188MHz (1002.375MHz effecti...
$0100000007 Reference clock : 27.000MHz
$010000000b HW masked units : none

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Конкретно интересует какое значение у вас для Hardwired ID :
0041 (ROM strapped to 0045) или
0045 (ROM strapped to 0045).