I heard that when new series comes out in August-september , older ones like rtx 2060-2070 will be cheaperThe best time is when the one you want is at a price you want to pay, and you have that money in hand.
There is no magical 'best'.
Zero guarantee of that happening.I heard that when new series comes out in August-september , older ones like rtx 2060-2070 will be cheaper