[Thundaar2000]

This att version will have 16 gig on board memory. The sprint version will have a microSD slot too, and I think a bigger battery.
Here are specs from htc site for the ATT version:

Operating System
Android™ 4.0 (ICS) + HTC Sense™

Processor
1.5 GHz Dual Core
Qualcomm MSM8960

Memory RAM 1 GB DDR2

Memory Storage
16 GB onboard storage

Display 4.7" HD super LCD 1280 x 720

Network
LTE CAT3 - DL 100 /UL 50
LTE: 700/AWS
WCDMA: 2100/1900/AWS/850
EDGE: 850/900/1800/1900

Wi-Fi®
802.11 a/b/g/n

Battery
1,800 mAh, Embedded

Camera
(Main): 8 MP, f/2.0, BSI,
Single LED-Smart Flash, ImageChip,
1080p HD Video with Stereo Sound
(Front): 1.3 MP with 720p video
Audio
Universal Beats Audio

Dimensions
134.8 x 69.9 x 8.9 mm