Could you notice a 40fps game?

I think it only really matters in 2D, where the trouble with 30 hz is things have to jump two pixels to keep up with a 60 hz sprite moving every pixel. 40hz would look really bad in 2D as it would move 1pixel every frame and 2 every other.

Graphics 640,480,32

While Not KeyHit(KEY_ESCAPE)
	x=x+1
	If x>500 x=0
	
	Cls
	DrawRect x,0,100,100
	DrawRect x&510,200,100,100
	Flip
Wend