This is what the new Sempron 3100+ with the E core stepping looks like:
The last two letters of the marking, “BO”, indicate that this is a new core, from the same family as the just reviewed Venice. As you remember, the same processors based on the D core revision were marked with “BA” letters at the end. The rest of the marking abbreviation states that this CPU features 256KB L2 cache, 1.4V Vcore and bears the maximum processor case temperature of 69oC. In other words, everything remained the same as by the older Sempron processors based on CG and D core revisions.