What are the correct specs of Tecno W3 smart phone? I would like to by Tecno W3 smart phone (Android 6.0 Marshmallow). 

I googled to know its GPU. Some websites said it's Mali-400 GPU such as:


http://bestmobs.com/tecno-w3/
http://naijaquest.com/tecno-w3-specs-features-reviews-and-price-official/


And other websites said it's Mali-400MP2 GPU such as:


http://www.androidphonesinnigeria.com/tecno-w3-full-specifications-features-price/
http://www.droidafrica.com/tecno-w3-brings-android-60/


The official website of the phone does not give any information about the GPU nor the part number of the CPU IC.

How can I know the real GPU when I test the phone at the shop? Is there an android test code? Thank you very much,
Test it with CPU-Z when you're in store and permitted to access the device.