SM 2 is a benchmarking tool I only recently found out about. What’s great about it, is that it can spit out the usual MB/s results in addition to an overall ‘Sciencemark’. The Sciencemark bases it’s result on various criteria including the speed and latencies of the modules
Even though mathematical calculations like this are extremely CPU intensive, they are also ram intensive. The faster your ram, the faster the overall calculations will be also. How SuperPi works is that you can specify how many digits you want to calculate past the decimal point. If you choose 1 Million, it will begin with the 3. and continue with 14359 all the way until it hits the 1 Millionth digit mark.
MemTest is not really a benchmark, but rather a memory error checker. I use it to grab the bandwidth value though, because as you overclock it, it will go higher. It gives you a quick and general idea of whether your overclock did any good or not.