In case you’ve forgotten about the Samsung Galaxy S3, Samsung wants to remind you of its existence with the more svelte Galaxy S3 Slim. However, this refreshed version of S3 has lower specs than its predecessor. It runs on Android 4.2 with a 1.2GHz quad-core processor, 1GB of RAM, and 8GB internal storage (expandable up to 32GB via microSD). It has a 4.5-inch TFT qHD display, 5-megapixel rear camera, VGA front camera, and 2100 mAh battery. The only advantage the new S3 has on the original is its slimmer form factor.
Source: The Droid Guy