Both of them are Albatron,standar pcb-coolind 4890s that is.The bios is also ATI standar.

Here is what I used to get my 3 cards up to 1000/1100. It has voltage adjustments, fan control and clock adjustments as well. Much easier than Rivatuner, plus it works right out of the box without modifications.

http://www.techpowerup.com/downloads...Preview_1.html

Yah 1000MHz seems a reasonable expectation, it actually surprised me how few 4890 posts there were at hwbot with not much higher core speeds.

Most cards are bios limited around 1070Mhz on core. There is supposedly a bios coming to unlock this.

http://www.xtremesystems.org/forums/...d.php?t=228334

What was your max stable clock on your cards before you tweaked em gunslinger? One of mine is around 990 ish while the other two are only 940 ish. Also with that utility, do you have to make the changes everytime you boot windows or does it set them automatically everytime?

Well its not official yet but here have a read. Same link as in post # 24.

Max clocks were around 950 on the core. The tool requires you to set the voltage after reboot.