Select fixed number of records/rows from growing table from SQL Server?
There's probably a more elegant way to achieve this but it can be done by using the NTILE function inside a CTE.

WITH cte AS (

  SELECT NTILE(5) OVER (ORDER BY id asc) AS dist,
  memory
  FROM TABLE)

  SELECT TOP 1 id, memory FROM cte WHERE dist = 1

  UNION

   SELECT TOP 1 id, memory FROM cte WHERE dist = 2

  UNION

   SELECT TOP 1 id, memory FROM cte WHERE dist = 3

  UNION

   SELECT TOP 1 id, memory FROM cte WHERE dist = 4

  UNION

   SELECT TOP 1 id, memory FROM cte WHERE dist = 5;