Hello, I am not sure yet, but I think that there is mistakee here. Memory Bus Type, according to Notebookcheck is 128 bit -> http://www.notebookcheck.net/NVIDIA-GeForce-9700M-GT.9454.0.html

Field Value
Graphics Processor Properties
Video Adapter nVIDIA GeForce 9700M GT (Acer)
BIOS Version 62.94.3C.00.06
GPU Code Name G96M
PCI Device 10DE-064A / 1025-0145 (Rev A1)
Transistors 314 million
Process Technology 65 nm
Bus Type PCI Express 2.0 x16 @ x16
Memory Size 512 MB
GPU Clock (Geometric Domain) 575 MHz (original: 575 MHz)
GPU Clock (Shader Domain) 1450 MHz (original: 1450 MHz)
RAMDAC Clock 400 MHz
Pixel Pipelines 8
TMU Per Pipeline 1
Unified Shaders 32 (v4.0)
DirectX Hardware Support DirectX v10
Pixel Fillrate 4600 MPixel/s
Texel Fillrate 9200 MTexel/s

Memory Bus Properties
Bus Type GDDR3
Bus Width 128-bit
Real Clock 799 MHz (DDR) (original: 800 MHz)
Effective Clock 1598 MHz
Bandwidth 25.0 GB/s

Utilization
GPU 0%
Memory Controller 1%
Video Engine 0%

nVIDIA ForceWare Clocks
Level #1 GPU: 169 MHz, Shader: 338 MHz, Memory: 100 MHz
Level #2 GPU: 275 MHz, Shader: 550 MHz, Memory: 300 MHz
Level #3 GPU: 400 MHz, Shader: 800 MHz, Memory: 300 MHz
Level #4 GPU: 575 MHz, Shader: 1450 MHz, Memory: 800 MHz

Graphics Processor Manufacturer
Company Name NVIDIA Corporation
Product Information http://www.nvidia.com/page/products.html
Driver Download http://www.nvidia.com/content/drivers/drivers.asp
Driver Update http://driveragent.com?ref=59