This paper investigates the perspective of the use of an unfamiliar bitumen modifier - Ethylene-Octene-Copolymer (EOC) - for the production of polymer modified bitumen (PMB). For the study, bitumen 70/100 was modified at a laboratory with EOC and SBS modifiers. From the industrial bitumen manufacturer, SBS modified bitumen 45/80-55 (SBS fact) was obtained. The rheological properties of the laboratory-produced and the industrially-produced bitumen were compared. In addition to the industrial binder, two laboratory-produced PMB compositions with the lowest viscosity on the one hand (70/100+2%EOC) and the highest viscosity on the other hand (70/100+4%SBS) were used to design asphalt mixtures. The following performance tests were used to evaluate physical properties of the obtained asphalt mixtures: wheel tracking test (WTT), thermal strain restricted specimen test (TSRST) and four-point bending test (4PB). In comparison to the laboratory-produced SBS modified bituminous binder containing asphalt mixture the EOC modified counterpart demonstrates a better low-temperature cracking behaviour, approaching the values characteristic of the SBS fact bound asphalt mixture. In its turn, rutting and fatigue resistance of the SBS lab modified bitumen containing asphalt mixtures are higher in comparison to EOC lab modified systems. Even higher fatigue resistance of SBS fact containing systems is evidently connected with a better mixing quality due to technical aspects ensured in bitumen production plant.