Elite Bastards posted a review on the Sapphire Radeon HD 4890 Vapor-X 1GB video card

While we've looked at a couple of factory overclocked Radeon HD 4890 boards which sport only increases to core clock speed, Sapphire have taken different approach with this Vapor-X offering, increasing both core and memory clocks out of the box. Thus, the Radeon HD 4890 uses a core clock speed of 870MHz (just 20MHz higher than a reference board, and below the 900MHz seen on other cards), while the GGDR5 memory on the board is clocked at 1050MHz, representing a 75MHz increase over a reference board.

Things get really interesting when we check out the rear of the Radeon HD 4890 Vapor-X however, as we find ourselves looking at the most comprehensive set of connectivity I can remember seeing on a single graphics board. The four outputs on the back of the card comprise of a VGA, dual-link DVI, HDMI and DisplayPort connector to cover all of your bases, with an HDMI to DVI adapter also included in the card's bundle for dual DVI monitor support. Bad news if you're looking for standard TV-out functionality or need to run two dual-link DVI monitors (two 30" LCDs in other words), but a fantastic plethora of outputs for everyone else which has left me really rather impressed.

Sapphire Radeon HD 4890 Vapor-X 1GB Video Card Review