Radeon HD 5830 @ Guru3D
Quote: "We test the Radeon HD 5830. So where then was still a gap in the market for ATI ? Well, in-between the Radeon HD 5770 and Radeon 5850 there is room for another product. A product that would cost roughly 250 USD and performance wise would sit in-between the aforementioned graphics cards."
Read the review here