Memory about 4 Gbytes is tested using a DOS diagnostics program that remaps memory to a 32-bit addresses. In some embodiments, memory above 3 Gbytes is tested in 1 Gbyte blocks until the end of memory is reached using a physical address extension that extends addresses from 32 bits to 36 bits. Testing...http://www.google.de/patents/US6738882?utm_source=gb-gplus-sharePatent US6738882 - Concurrent multi-processor memory testing beyond 32-bit addresses
