I have compiled the following so far, regarding cards and speeds:
Gigabyte G1 Gaming:
Memory: TBD Base: TBD Boost: TBD
MSI Armour OC
Memory: 10010 Base: 1657 Boost: 1797
Gainward Phoenix
Memory: 10000 Base: 1607 Boost: 1733
Gainward Phoenix Golden Sample
Memory: 10000 Base: 1708 Boost: 1847
EVGA SC
Memory: 10010 Base: 1708 Boost: 1847
EVGA FTW
Memory: 10010 Base: 1733 (TBC) Boost: 1873 (TBC)
ASUS ROG Strix Gaming OC
Memory: 10000 Base: 1759 Boost: 1898
ASUS ROG Strix Gaming OC (OC Mode)
Memory: 10000 Base: 1784 Boost: 1936
MSI Gaming X
Memory: 10108 Base: 1708 Boost: 1847
ASUS Strix Gaming Aura
Memory: 10000 Base: 1784 Boost: 1936
MSI Aero
Memory: 10000 Base: 1607 Boost: 1733
MSI SeaHawk
Memory: 10108 Base: 1708 Boost: 1847
Inno3D iCHILL Air Boss x3
Memory: 10400 Base: 1759 Boost: 1898
Zotac Amp Extreme
Memory: 10000 Base: TBD Boost: TBD
KFA2 EX OC
Memory: 10000 Base: TBD Boost: TBD
Inno3D iCHILL Air Boss x4
Memory: 10400 Base: 1759 Boost: 1898
Zotac Amp Edition
Memory: 10010 Base: 1683 Boost: 1822
All Founders
Memory: 10000 Base: 1607 Boost: 1733
Out of those I could find info on, the Card with the highest base clock (and boost) seems to be the ASUS Strix. It also seems to be one of the more expensive ones.