Cool you have got your stuff that fast =)
The memscore are quite normal, when I hade AMD system different bioses gave very diffirent resultat so we can hope for some boost. From what I can tell your mem will never hold you back. So now it's all about overclock from here.
If your not having the AV bios in there could you maybe post if there are diffrences?
you are right now @ 133 x 21 then? = 2800 Mhz =)
you might get a overclock like 158 x 21 = 3300 and then you will be at DDR speed of 420 and then the bandwith will be around 3200.
Read somewhere that if your cpu is at 3000Mhz like mine, the band with must be 3000 or more. Else the CPU will not be that effective. so if you have a 3000 cpu and a bandwith of 2100. The cpu might have a real rate of 2400Mhz.
I think this is why AMD systems with more bandwith have these strange rating system.
So the tip is to have more bandwith then your CPU's Mhz
or else it will suffer from the Intel chip bottleneck ...
I have the PC3200C2 stick and it runns at DDR420 2-6-3-3 @2.7V
so if you are not planning of gigantic overclock your mem will be fine @ 2,5V maybe