ocaholic.ch posted a review on the Sapphire Radeon HD 4890 1 GByte

Sapphire presents one of the first Radeon HD 4890 based on AMD/ATIs new and overworked RV790 chip. It comes with 100 MHz more clock speed on the GPU and 150 MHz more clock speed on the cards memory.

Sapphire Radeon HD 4890 1 GByte Review