When you return to china, and all the Augs start experiencing the weird side effects, what is the result of going to the limb clinic and upgrading your chip vs. not going and upgrading? or does it not matter?
It does matter. Spoiler:
Just before you fight the third boss, Zhao uses something on you. If you have the upgraded biochip, you essentially have a permanent EMP. Your HUD is messed up, so you don't have a radar, health/battery meter, ammo, etc. I found I was able to use augmentations though (such as looking through walls). I just didn't know how much battery power I had left.
When you didnt get the LIMB upgrade:
Zhao uses the device on you to disable your augmentations and fails, she can hardly believe it. Then the boss comes to kill you but will have a difficult time.