What do you mean by attacked? When China is finally united will get even cheaper video cards. It cannot happen fast enough.
China is already unified.
However, China adding more occupied territories to its cruel and evil empire is unlikely to result in cheaper video cards:
1. The US is required by law to defend Taiwan.
2. It is very likely China will cease exports to people shooting at it.
3. Since the majority of computer board final assembly is done in China, this would result in a massive supply shortage resulting in skyrocketing prices.
War would not result in cheaper computer components in our lifetime.