here you have better photos 
 View attachment 760482
View attachment 760482
1) top of card is longer than bottom
View attachment 760483
2) just in front the grey protection is shorter
Just for information if that has some use to someone, here is the system information details on GPU (in French, but well you'll get it ^^):
Radeon RX Vega 64 :
  Jeu de composants :    Radeon RX Vega 64
  Type :    Processeur graphique (GPU)
  Bus :    PCIe
  Longueur de la voie PCIe :    x16
  VRAM (dynamique, max.) :    8176 Mo
  Fournisseur :    AMD (0x1002)
  Identifiant du périphérique :    0x687f
  Identifiant de révision :    0x00c1
  Metal :    Pris en charge, modèle de réglages macOS GPUFamily1 version 3
  Moniteurs :
Acer CB281HK - forced RGB mode (EDID override) :
  Résolution :    3840 x 2160 (2160p 4K UHD - Ultra High Definition)
  L’interface graphique ressemble à ceci :    1920 x 1080 @ 60 Hz
  Profondeur de mémoire d’image :    Couleurs 24 bits (ARGB8888)
  Moniteur principal :    Oui
  Miroir :    Désactivé
  Connecté :    Oui
  Rotation :    Géré
  Régler la luminosité automatiquement :    Non
  Type de connexion :    DisplayPort
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Finally just a quick question, on these dual bios GPU which one is which? 
 
when i installed it the button was switched to the front of cMP, i tested it and switched it yesterday to the back side of cMP and i can't really see a difference 
 
which position is the OC? which one is the normal?