They are both brutally fast chips
If i were you, I'd go with the I5 and save some money. ( the stp of the I5 > stp of I7 so, the I5 processor is the best for pcsx2 )
I ask the seller if he can change the cpu but I donĀ“t realy sure because it runs perfectly right now, but I ask thank you Nobbs66 and ssakash
Only the single thread performance matters in case of pcsx2.