|As I said in my other response, "FSB speed is where you'll gain performance".|
8 x 400 will perform better than 11 x 300 because the FSB is running 33% faster. And for optimal performance, it's important to maintain a 1:1 frequency ratio. In other words, if the CPU freq is 400MHz, the RAM freq should be 400MHz.
You should be taking full advantage of your hardware capabilities. The board can handle 400MHz (1600MHz FSB), the CPU can handle 400MHz (1600MHz), & the RAM can 400MHz (800MHz DDR). So why are you running everything at 300MHz?