[S.Designer] How can I stop the AO map from tiling in one direction?

IngridEngelschion

I have this floor material, and the intention is for it to tile horizontally, but not vertically. The edge (the long rectangles at the top) is the end of the floor, but the AO generated from this edge tiles and continues on the bottom of the texture (you can see it has a darker gradient at the bottom). How can I solve this? 

I have a very simple setup for the AO generation, if thats relevant. 

Benjammin

Look at tiling mode in the parameters. Setting that to H tiling might do what you want - it'll need to be on the blend node for the AO generation to inherit it. 
If that doesn't work, you might need to mask different parts and generate AO separately.

gnoop

Turn off GPU optimization  after  what Benjammin suggested.

Also it's impossible to kill in RT version of AO node.