|"is not supposed to be dram frequency 1333@mhz"|
Don't confuse data rate & frequency. You seem to have it backwards. DDR3-1333 does NOT run at 1333MHz frequency, it runs at 667MHz frequency...1333MHz is the data rate.
For a Core 2 Duo (or Quad) system, the optimal CPU:DRAM frequency ratio is either 1:1 or 1:2. What that means is, if the CPU is running at 1066MHz FSB (266MHz frequency), the RAM should run at either 266MHz or 533MHz frequency. So the correct RAM setting for your system is either 266MHz DDR3_533 or 533MHz DDR3_1066. Since the 1st one isn't even an option, you should use 533MHz DDR3_1066.
"mobo: ASRock G41 Express Chipset"
It would have helped to list the exact model number. ASRock makes over a dozen board based on the G41 chipset, but the ones that support DDR3 don't support DDR3-1333 unless the system is overclocked. For instance, below is the page for the ASRock G41C-GS. Notice what it states for the memory:
"Supports DDR3 1333(OC)/1066/800 non-ECC, un-buffered memory"
FYI, OC = OverClock