I just repeated my memtes86 of a sempron 3400+
The reported speed results were identical when using a single stick of 2Gb DDR2 800 cas 5-5-5-18 or 2 sticks of DDR2 667 512Mb 4-4-4-11 !!!!
CPU 2007Mhz (FSB223)
L1 16447 MB/s
The same! Wow it's something with CPU? Maybe the reason faster mem doesnt usually show up is that the faster mem cant be used by most processors?