Here’s a quick comparison video of international HTC One X versus AT&T HTC One XL using Quadrant and Antutu benchmarks.
If you look carefully, in both tests the quad-core HTC One X scores much higher in CPU ratings (30-50%). Also notice that the quad-core One X finishes both tests a bit earlier than the HTC One XL.
Well, now you know what I know, the international quad-core HTC One X is faster of them all, especially when it comes to raw CPU power.