Dual Channel works but timings slow

[Berg]

I recently brought another stick of rosewill 512 pc3200 ram to compliment my original stick of rosewill 512 pc3200 ram. Upon recieving and inspecting the ram, i found out the 2 ram sticks are different and the names on the ram chips are different. They seem to be from different manufacturers and have a couple of physical differences. I then installed them and booted up my system. On the boot menu screen it says they are running dual channel at 3 3 3 8. These arent very good timings and the rams originally run at 3 4 4 8 single. The rosewill site says their dual channal kits run at 2.5 3 3 7 and i was wondering if it was possible to change my timings to those even though i didnt buy the kit and if it would be safe. Thx in advance.