If the links don't work, here is the specs from the site:
The obvious differences are the memory clock speed and the memory size. Which is more important? 128mb ram or 100mhz?
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Brand ASUS
Model N6200/TD/128
Chipset
GPU Geforce 6200
Core clock 350MHz
PixelPipelines 4
Memory
Memory Clock 500MHz
Memory Size 128MB
Memory Interface 64-bit
Memory Type DDR
3D API
DirectX DirectX 9
OpenGL OpenGL 1.5
Interface
Interface AGP 4X/8X
Ports
D-SUB 1
DVI 1
TV-Out Composite Out
VIVO No
General
Tuner None
RAMDAC 400 MHz
Max Resolution 2048x1536
SLI Supported No
Cooler Heatsink
Operating Systems Supported Windows 2000/XP
System Requirements One available AGP compliant slot
Installation software requires CD-ROM or DVD-ROM drive
VGA or DVI- 1 compatible monitor
Features
Features NVIDIA UltraShadow technology Enhances the performance of bleeding-edge games
NVIDIA CineFX 3.0 engine
Full support for Microsoft DirectX9.0 Shader model 3.0 enables stunning and complex special effects
NVIDIA Intellisample 3.0 technology
The industry's fastest antialiasing delivers ultra-realistic visuals, with no jagged edges, at lightning-fast speed
NVIDIA nView multi-display technology
Provides the ultimate in viewing flexibility and control for multiple monitors
Vertex Shaders 3.0
Pixel Shaders 3.0
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Brand eVGA
Model 256-A8-N341-LX
Chipset
GPU Geforce 6200
Core clock 350MHz
Memory
Memory Clock 400MHz
Memory Size 256MB
Memory Interface 64-bit
Memory Type DDR
3D API
DirectX DirectX 9
OpenGL OpenGL 1.5
Interface
Interface AGP 4X/8X
Ports
D-SUB 1
DVI 1
TV-Out S-Video Out
VIVO No
General
Tuner None
RAMDAC 400 MHz
Max Resolution 2048x1536@85Hz
SLI Supported No
Cooler Heatsink
Operating Systems Supported Windows 2000/XP
System Requirements Minimum of a 200 Watt power supply.
Features
Features CineFX 3.0 Engine
Powers the next generation of cinematic realism. Full support for Microsoft® DirectX® 9.0 Shader Model 3.0 enables stunning and complex special effects. Next-generation shader architecture delivers faster and smoother gameplay.
UltraShadow II Technology
Enhances the performance of bleeding-edge games, like id Software’s Doom III, that feature complex scenes with multiple light sources and objects. 2nd-generation technology delivers more than 4x the shadow processing power over the previous generation.
Intellisample 3.0 Technology
The industry’s fastest antialiasing delivers ultra-realistic visuals, with no jagged edges, at lightning-fast speeds. Visual quality is taken to new heights through a new rotated grid sampling pattern.
Hardware MPEG-2 Encoder Hardware MPEG-2 Encoder