AMD's new GPU is called "Tahiti LE" even though it's a part of the Radeon HD 7800 series, because it is derived from the same 3.5 billion-transistor "Tahiti" silicon that goes into making all Radeon HD 7900 series products and not the "Pitcairn" silicon that goes into making the HD 7870 GHz Edition and HD 7850. The new SKU drops the "GHz Edition" moniker by featuring lower clock speeds than the HD 7870 GHz Edition, but it makes up for that with more pixel-crunching muscle.
Tech Power Up
http://www.techpowerup.com/reviews/Club_3D/HD_7870_jokerCard_Tahiti_LE/
HD 7870
- 1280 shader units
- 32 ROPs
- 2GB VRAM
- 256-bit memory bus
- core clock @ 1000 MHz
- memory clock @ 1200 MHz
HD 7870 Joker Card
- 1536 shader units
- 32 ROPs
- 2GB VRAM
- 256-bit memory bus
- core clock @ 975 MHz
- memory clock @ 1500 MHz
HD 7950
- 1792 shader units
- 32 ROPs
- 3GB VRAM
- 384-bit memory bus
- core clock @ 800 MHz
- memory clock @ 1250 MHz
The Good
Good overclocking potential
Solid PCB design
Supports CrossFire with HD 7950 and HD 7970
Support for software voltage control
Very quiet in idle
Full-size HDMI output
Support for PCI-Express 3.0 and DirectX 11.1
The Bad
High power consumption during gaming, multi-monitor and Blu-ray
A bit too expensive
Noise while gaming could be lower
Can't CrossFire with regular (Pitcairn-based) HD 7870
