WangGang :
Hlsgsz :
The manufacturer's website will have that stated. No way to know as there are many models and they differ.
Who manufactures the reference cards? Nvidia's spec page has nothing on it.
Multiple manufacturers do that. The manufacturer shoudl be specified somewhere on it. Or, atleast a code you can google.
EDIT: here it says it's 3 pounds: https://www.amazon.com/EVGA-Superclocked-Dual-Link-Graphics-02G-P4-3771-KR/dp/B00DOPW4DO