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1st card:
Nvidia Geforce GTX 550 Ti (Fermi) 2GB 192-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card

Model
Brand
EVGA
Model
02G-P3-1559-RX

Interface
Interface
PCI Express 2.0 x16

Chipset
Chipset Manufacturer
NVIDIA
GPU
GeForce GTX 550 Ti (Fermi)
Core Clock
900MHz
Shader Clock
1800MHz
CUDA Cores
192

Memory
Effective Memory Clock
4008MHz
Memory Size
2GB
Memory Interface
192-bit
Memory Type
GDDR5

Features
Features
NVIDIA CUDA technology with CUDA C/C++,DirectCompute 5.0 and OpenCL support
NVIDIA PhysX technology
NVIDIA SLI ready
NVIDIA 3D Vision Ready
NVIDIA PureVideo HD technology

2nd Card:
GIGABYTE GV-N550WF2-1GI GeForce GTX 550 Ti (Fermi) 1GB 192-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card

Model
Brand
GIGABYTE
Model
GV-N550WF2-1GI

Interface
Interface
PCI Express 2.0 x16

Chipset
Chipset Manufacturer
NVIDIA
GPU
GeForce GTX 550 Ti (Fermi)
Core Clock
970MHz
Shader Clock
1940MHz
CUDA Cores
192

Memory
Effective Memory Clock
4200MHz
Memory Size
1GB
Memory Interface
192-bit
Memory Type
GDDR5

It says this one is Factory Overclocked @ 970MHz

Watch these specs carefully
1st one has 2GB GDRR5
2nd one is overclocked

which one is better please help im confused D: