|CPU-Z is listing what they are running at, you also need to read what the memory says on the stickers to see if they will run at that setting, possibly experimenting to get it to run, or purchase a matched pair of memory sticks that will definitely run on your board.|
Run Memtest86 from a bootable CD and see:
If the memory is properly detected there.
If there are any memory errors at that setting.
Errors are not acceptable in memory. Manually resetting the timings 'looser' and possibly the voltage a tiny bit higher may resolve this, but a retest through more than one cycle would be required to verify it is stable and 'solid' to use.
Going back, I always use matched memory sets on DDR2 and DDR3 memory for best results.
You have to be a little bit crazy to keep you from going insane.
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