The US version of the device, solely available through AT&T, will instead feature Qualcomm's 1.50GHz dual-core Snapdragon S4 processor, a 28nm SoC featuring Adreno 225 graphics, improved ISP and Qualcomm's new baseband with support for nearly every air interface out there. No need to fear, however, as AnandTech's recent performance benchmark and analysis of the 28nm Qualcomm MSM8960 reveals performance scores that blow away all other current dual-core SoCs on the market (although performance versus new Cortex-A15 SoCs remains to be seen, of course).
Nevertheless, AT&T has opted for a hardware trade-off with its HTC One X. In exchange for a dual-core SoC, it is including an LTE radio for the US version of the device which will allow it to become one of the company's first flagship 4G LTE smartphones.
In other words, we can all expect heavy amounts of somewhat annoying "4G LTE" marketing when the AT&T HTC One X launches in the US within the next 60 days.