What is the difference between these three video cards? I can see that one is overclocked, however I don't see the difference between the other two. Thanks.
MSI Radeon HD 7870 GHz Edition R7870-2GD5T/OC Video Card
MSI Radeon HD 7870 GHz Edition R7870 HAWK Video Card
MSI Radeon HD 7870 GHz Edition R7870 Twin Frozr 2GD5/OC Video Card
MSI Radeon HD 7870 GHz Edition R7870-2GD5T/OC Video Card
MSI Radeon HD 7870 GHz Edition R7870 HAWK Video Card
MSI Radeon HD 7870 GHz Edition R7870 Twin Frozr 2GD5/OC Video Card