I also had trouble going over 265, and I was able to push to ~272 memtest stable for 20+ loops using the following settings.. you might want to try them!
Using these I get ~7100mb/s bandwidth in Sandra
Code:
Freq 200 (1:1)
CPC Enable
Tcl 3
Trcd 4
Tras 8
Trp 3
Trc 7
Trfc 13
Trrd 2
Twr 2
Twtr 2
Trtw 3
Tref 3120
Twcl 1
Interleave Enable
DQS Skew Auto
Skew value 0
Drive Strength Auto
DD Strength Auto
Max Latency 7.0 ns
DRAM resp tm Fast
Read Preamble 6.0 ns
IdleCycle Lmt 256 cycles
Dynamic Ctr Enable
R/W Q bypass 16 X
Bypass Max 07 X
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