Generate large number of random card decks - NumPy

Question

I need to generate a large number of random poker card decks. Speed is important so everything has to be in numpy matrix form.

I understand I can generate two cards

Answer 1

A another simple approach, slightly slower than @Holt best solution.

def vectorized_app(N):
    u=np.random.randint(0,12*4,(2*N*103//100)).reshape(-1,2) # 3% more tries. 
    w=np.not_equal(*u.T) #selecting valid output, Two differents cards.
    return u[w][:N]