Please google "GPU price hike bitcoin".
The bitcoin block chain is totally connected to the servers that are used for mining and for validating the transactions. A hike in the bitcoin "value" means that more mining is going to occur and thus more servers are going to be used and thus high spec server price is going to rise.
One bitcoin transaction requires as much energy as required by a house in one week.
GPUs are not used for Bitcoin mining FFS! ASICs are used for that. Specialized mining equipment. Not usable for anything else.
Bitcoin transaction does not have any energy requirements. There is a required energy (based on current difficulty) to mine a Bitcoin block.
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