You will not gain fps from this. Setting the agp latency lower will sometimes help fix stuttering in games & movies. I found movies always had a jerkyness for me & setting agp latency lower solved it for me. Setting agp latency low can actually cause display & graphical problems as thats why ATI overrides it to 244/255. PCI clk settings are not universal for everyone so depending on your hardware/rig, certain settings work better/worse for others. Default is 32 clks & is what most people use, but some users perfer 64 & have solved problems with using 64 clks.