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How much better will the 6770 be over the 5770?

Jan 1, 2009
106 (0.03/day)
System Name Idk
Processor Athlon II x4 Propus 620 @3.6ghz ~ 2.6ghz Stock
Motherboard MSI 890FXA-GD70
Cooling Cooler Master V8 with Arctic Silver 5 thermo paste
Memory 4gb DDR3 1600 ADATA
Video Card(s) Sapphire Radeon HD 5770 1GB GDDR5 128-bit
Storage 1tb SATA Seagate ST31000340AS
Display(s) ht09 28" lcd 1080p 16:10 t.v
Case Antec 902
Audio Device(s) AC'97 hd
Power Supply Corsair 650TX
Software Windows 7
The sheets make the 6770 Barts xt look better if not double than the 5770 Juniper xt in terms of texture units, texture fillrate and pixel fillrate. How much faster will it be? What do these mean? The 6870 won't be the fastest apparently and made me confused. The problem is I currently have a 5770 but I may be considering to get it crossfire. If the 6770 is worth it I may get it instead of a crossfire 5770. Ill just use the 5770 in another computer or sell it.
May 4, 2009
1,940 (0.61/day)
System Name penguin
Processor i3-4160
Motherboard Asus H81 Mini-ITX
Cooling Stock
Memory 2x4GB Kingston 1600MHz
Video Card(s) Saphire Radeon 7850 2GB
Storage Plextor M5S 120GB+1TB Seagate
Display(s) 23' Dell
Case CM Elite 130
Audio Device(s) stock
Power Supply Corsair CX430m
Software W7/Lubuntu
From what I understand and looking at the image of the last leaked road-map, there won't be a rename. The 5770 will continue to be marketed with the same name