Hi @Thanh,
The Tobii EyeX is designed to operate with applications designed using the Tobii SDK only.
That being said, the software in question Optikey does indeed specify that it will work with the EyeX Tracker.
The high system requirements we demand are not a reflection on running games, but rather the processing that is required within Windows for the eye tracker to operate effectively.
My suspicion is that it should work fine with the Surface Pro i5 for your needs so long as the RAM is suitable upgraded to 8GB.