IBM System x3850 X5 Implementation Manual page 248

Full Memory Test is if you have an intermittent memory problem that you are trying to
isolate.
Because the server identifies which specific DIMMs are experiencing excessive single-bit
failures, it is far more efficient to swap reported DIMMs with similar DIMMs inside the
server to see if the problem follows the DIMMs, stays with the memory slots, or simply
goes away because the DIMMs were reseated.
Figure 6-4 Start-up panel for the built-in diagnostics
3. The quick diagnostics continue to run, reporting the test that the quick diagnostics are
performing currently and the length of time that it will take to complete that phase. If an
error occurs, the quick diagnostics stop and indicate the memory errors that were
encountered before progressing into more advanced diagnostics, as shown in Figure 6-5.
Figure 6-5 Quick Memory Test progress panel
You can terminate the diagnostics at any point by pressing Esc.
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IBM eX5 Implementation Guide