Lowering FSB Increases WPA2 Speed

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My APIC is disabled in bios or whaterver its called

I think you are confusing ACPI for APIC. Same letters, different things.

I can achive speeds of 160 kh/s on my R9280X OC (Overclock edition) default clock is 1100 mhz. It does 160 kh/s right out the box.

Well yes, of course if you are overclocking you will get higher speeds. That's why in the math I said I assumed a 1Ghz clock. For 1.1 Ghz,

2048 * 1100000000 / 14000000 = 160.9 KH/s max theoretical performance

So that aligns perfectly what what you are getting.