Checking my card vs this 8870
8870
1000MHz Engine Clock
2GB GDDR5 Memory
1200MHz Memory Clock (4.8 Gbps GDDR5)
153.6GB/s memory bandwidth (maximum)
2.56 TFLOPS Single Precision compute power
GCN Architecture1
o 20 Compute Units (1280 Stream Processors)
o 80 Texture Units
o 128 Z/Stencil ROP Units
o 32 Color ROP Units
o Dual Geometry Engines
o Dual Asynchronous Compute Engines (ACE)
256-bit GDDR5 memory interface
PCI Express 3.0 x16 bus interface2
DirectX® 11.1-capable graphics
OpenGL 4.2 support
http://www.amd.com/us/Documents/AMD_Radeon_HD_8870_Feature_Summary.pdf
versus
■1000MHz Engine Clock
■2GB GDDR5 Memory
■1200MHz Memory Clock (4.8 Gbps GDDR5)
■153.6GB/s memory bandwidth (maximum)
■2.56 TFLOPS Single Precision compute power
■GCN Architecture
◦20 Compute Units (1280 Stream Processors)
◦80 Texture Units
◦128 Z/Stencil ROP Units
◦32 Color ROP Units
◦Dual Geometry Engines
◦Dual Asynchronous Compute Engines (ACE)
■256-bit GDDR5 memory interface
■PCI Express 3.0 x16 bus interface
■DirectX® 11.1-capable graphics
■OpenGL 4.2 support
http://www.amd.com/us/products/desktop/graphics/7000/7870/pages/radeon-7870.aspx#/3
Wow, they really ONLY changed that 7, didn't they.