OS: Windows 7 64 bit or higher.
Processor: Intel Core i7 or better.
Memory: 4 or more GB RAM.
Graphics: DirectX 11.0 compatible (2 GB) or better.
DirectX: Version 11.
Hard Drive: 50 or more GB available space.
Sound Card: 9.0c compatible.
Those are the specs for the game, your GPU BARELY meets the minimum, RAM is at the minimum, and the CPU is below spec.
WWE 2K15 Requirements:
OS: 64-bit: Windows Vista SP2.
Processor: Core 2 Duo E6600, AMD Athlon 64 X2 5400+
Memory: 4 GB RAM.
Graphics: NVIDIA GeForce GTX 450 or AMD Radeon HD 5770, 1GB GDDR (DirectX11 compatible)
DirectX: Version 11.
Network: Broadband Internet connection.
Hard Drive: 22 GB available space.
So I would assume no, the WWE specs are lower than NBA and you have problems with the WWE. Based on your current performance and the specs you gave, I wouldn't waste the money on the game since you most likely won't play it well.