The One X comes equipped with the Tegra 3 quad-core 1.5GHz processor  backed up by 1GB of RAM, this is quite a statement by HTC as this phone  is 'best in class' in almost every department.
The specifications for the One X read: 
- Running on Android 4.0 Ice Cream Sandwich with HTC Sense
 - Quad-core 1.5GHz Tegra 3 processor
 - 1GB of RAM
 - 4.7" 720p Super LCD2
 - 8MP f2.0 camera with its own image processor
 - 1.3MP front-facing camera (capable of HD video chat)
 - 32GB internal storage - but no SD card slot and a non-removable battery
 - 25GB of free Dropbox storage
 - NFC capabilities
 - 1800mAh battery
 - 4G compatible 
 
sources: 
HTC One X - Full phone specifications
HTC One X – 4.7″ quad-core Android 4.0 monster | Eurodroid
HTC ONE X: Quad-core monster phone - Inspect-a-Gadget
MWC 2012: HTC overview - GSMArena.com