The OnePlus 3 was recently spotted online on Antutu benchmark with model number A3000. Now OnePlus 3 has been spotted again on GeekBench and GFXBench benchmarking websites.
While the OnePlus 3 with model name RAIN A3000 shows 4GB of RAM on GFXBench, on GeekBench it is listed with 6GB of RAM. So it is expected that OnePlus 3 could be launched in multiple variants. 
As per the listing on Geekbench, the OnePlus 3 will run on Android 6.0.1 Marshmallow and a Qualcomm Snapdragon 820 processor. As per the listing on GFXBench, OnePlus 3 has a 5-inch display that has full HD (1920×1080 pixels) resolution and 5 finger gesture support. Besides as per the listing, it has Qualcomm Snapdragon 820 2.1 GHz quad-core processor, 4GB RAM, 64GB of internal storage out of which 54GB is reserved for the users, Adreno 530 GPU and Android 6.0.1 Marshmallow operating system. In the listing there is no information about its battery or expandable memory.
As per the benchmark listing, the OnePlus 3 has a 16-megapixel Autofocus camera and an LED flash in its rear panel while a 8-megapixel camera is in its front for selfies. The GFX listing shows that the device has connectivity features like Bluetooth, GPS, NFC and WiFi. As per the listing, the device has accelerometer, gyroscope, light, proximity and pedometer Sensors as well.
Note – The above pic is for representational purpose only.