DailyTech has a great roundup of reviews of the new ATI Radeon HD4890.
ATI Radeon HD 4890 Edition
@ TweakTown
@ Club Overclocker
@ TweakTown
@ Hardware Canucks
@ Hot Hardware
@ Benchmark Reviews
@ Overclockers Club
@ Elite Bastards
@ Hartware.de
@ AMD Zone
@ Bjorn3D
@ InsideHW
See the full list at DailyTech.
HardOCP reviews the card as well.
http://enthusiast.hardocp.com/article.html?art=MTYzNiwxLCxoZW50aHVzaWFzdA==