Club 3D HD 7870 jokerCard Tahiti LE 2 GB Review

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.  

Club 3D Radeon HD 7870 jokerCard (Tahiti LE)
Tech Power Up
http://www.techpowerup.com/reviews/Club_3D/HD_7870_jokerCard_Tahiti_LE/

Powercolor HD 7870 Vertex II VS Powercolor HD 7870 Myst Edition

Which is better Powercolor HD7870 Vertex II with higher engine clock rate because its OC already or the new Powercolor HD 7870 Myst Edition with lower engine clock speed but higher memory clock speed and UEFI ready?

I believe the Myst Edition is better. It is based on Radeon 7950/7970 GPU (Tahiti LE) so it has more shaders and has PowerTune with Boost (975 MHz). The memory is faster as well at 1.5GHz (6GHz effective). Based on reviews, when overclocked the card reaches 1.2GHz core speed and 1.6GHz memory speed.