Sylvia,
Most folks that buy top-end boards and processors are enthusiasts (e.g., "K" or Extreme series). This typically means that we'll try over-clocking at some point. I understand your warning regarding the warranty, but there is not much point in us paying up to buy this gear if we're not interested in over-clocking. Therefore, the Intel gear should consistently hit the tested/rated specs provided by Intel, itself, for RAM XMP (OC) profiles:
http://www.intel.com/support/motherboards/desktop/dh77eb/sb/CS-033193.htm?wapkw=dh77eb
Let's keep in mind that desktop sales have been decreasing for several quarters/years for both Intel and Apple due to the shift towards mobile computing. So, in a sense, enthusiasts are your most dedicated customers and are often willing to pay up for the latest hardware. This should be kept in mind.
P.S. - Claudio the tested memory configs in the links above do not mean you cannot get other configs to work, but it takes a lot of testing and can be tricky (e.g., you might be able to get rated memory to run higher than its specs)...