BlackBerry Bold 9790 comes with a smaller size and lighter weight compared to the Bold 9900. Both have a similar design with support for touch screen and full QWERTY keyboard. BlackBerry Bold 9900 has touchscreen with a larger size than the Bold 9790.
BlackBerry Bold 9900 has a 2.8-inch touchscreen with a resolution of 640 x 480 pixels, while the BlackBerry Bold 9790 has a 2:45-inch touchscreen with a resolution of 480 x 360 pixels.
BlackBerry Bold 9790 and BlackBerry Bold 9900 both use the operating system of the latest BlackBerry OS 7. And both are powered by a 1.2GHz processor and 768MB of RAM. BlackBerry Bold 9790 and BlackBerry Bold 9900 have an internal memory of 8GB, and come equipped with a microSD slot up to 32GB.
BlackBerry Bold 9790 and BlackBerry Bold 9900 are both equipped with a 5 megapixel camera. Both come equipped with features complete connectivity from 3G network with HSDPA support, Wi-Fi, Bluetooth, GPS, and NFC.
BlackBerry Bold 9790 and BlackBerry Bold 9900 both have the same features just different on the dimensions and size of screen only. BlackBerry Bold 9790 priced at $ 450, while the BlackBerry Bold 9900 has a price tag of around $ 550.