Impact modifiers in polyamide 6 could lead to an improvement of (un)notched impact properties in some cases. The effect of particle size or the interparticle distance on this improvement is not yet totally clear. There are also questions about the influence of the phase connection. For daily use, low testing speeds are very interesting, but in most of the investigations only impact tests at high testing speeds are examined. In this work, it can be shown that the criterion of the critical interparticle distance for notched impact tests cannot be considered to be universal. It can also be proven that the criterion of the optimum particle size is only valid for notched impact tests if an adequate phase connection is given. Based on the findings of this work, the two most to important factors for a toughness optimization at low testing speeds in PA/EOR blends are a phase connection as strong as possible and particle sizes as small as possible.