5400 rpm drives are much slower than 7200rpm drives when it comes to operations/second (IOPS), and can only try to match them in sequential speeds.
The basic advantage of 5400 rpm drives is that they don't overheat. I've tried using Momentus XT in HP 6530b and it frequently went above 60C...
Block-by-block cloning does not preserve TRIM information! That's because TRIM can can only be send to the SSDs, but the invalidated block list cannot be read. Performance of your drive after simple block-by-block cloning can be thus affected.
Simple block cloning has it's advantages though...
Alternative to Momentus: you can have a large, conventional HDD plus a small SSD (eg. 32GB or 40GB) for cache. For caching you have to buy software like eBoostr
http://www.eboostr.com/
http://dotnet.agilekiwi.com/blog/2008/10/how-eboostr-works.html
or Nvelo Dataplex (difficult do get)...
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