Hi!
Dividers let you run the memory speed at less than the HTT speed of your CPU. For example, you could run the HTT speed of your CPU at 200MHz and the memory at 166MHz
2-3-2-6 are fairly tight timings really. You could try 1T just in case - you might be lucky! (There are a few rare cases where this has worked).
Otherwise, you could try reducing the timings slightly, say to 2-3-2-5
The other option is to overclock the HTT on your CPU. This will also increase your memory speed
As an example, to get the 2.8GHz stock speed of your FX57 you could run at 14x200 (stock) or 13x215 (the memory will now be at 215MHz), or 12x233 etc. Don't forget to reduce the HT multiplier to 4x or the speed to 800MHz (can be displayed as both in the BIOS) when overclocking the HTT. This is because you don't want the HT speed to go over 1GHz and this is calculated by multiplying the HTT speed by the HT multiplier. You'll also need to disable Cool & Quiet if you want to do this
This also assumes that your memory will overclock and it can introduce instability
