Step 3: Scroll down to "Graphics card (GPU)" section and look next to "GPU Units." If you are missing ROPs, it will give you a warning message, and show you the real number of ROPs that your card has.
So you can find out your Aadhaar card number through biometric details. However, you may have to pay some fee for this. Apart from this, you can also find out by calling the UIDAI helpline.