Many. That is why the price is rising.

I saw the proposal to change the block reward to 2, from 1.5 previously.

850MHz will be with core clock. The memory clock has to be 1250 MHz to have proper speed with Claymore miner.

You can run at 950 mV and 850 MHz. It depends on the quality of the card. That is more or less ballpark figure.

https://blog.ethereum.org/2016/11/18/hard-fork-no-4-spurious-dragon/

Hard Fork No. 4: Spurious Dragon

Posted by Hudson Jameson on November 18th, 2016.
The Ethereum network will be undergoing a hard fork at block number 2,675,000, which will likely occur between 15:00 and 16:00 UTC on Tuesday, November 22, 2016. A countdown timer can be seen at https://fork.codetract.io/. The Morden test network will be undergoing a hard fork at block number 1,885,000.

As a user, what do I need to do?

Download the latest version of your Ethereum client:

Latest version of Ethereum Wallet/Mist (v0.8.7)
Latest geth client (v1.5.2)
Latest Parity client (v1.4.4)
Latest ruby-ethereum client (v0.11.0)
What happens if I do not update my client?

If you are using an Ethereum client that is not updated for the upcoming hard fork, your client will sync to the pre-fork blockchain once the fork occurs. You will be stuck on an incompatible chain following the old rules and you will be unable to send ether or operate on the post-fork Ethereum network.

Importantly, if your client is not updated, it also means that any transactions you make will still be susceptible to replay attacks.

What if I am using a web or mobile Ethereum wallet like MyEtherWallet or Jaxx?

Ethereum websites and mobile applications that allow you to store ether and/or make transactions are running their own Ethereum client infrastructure to facilitate their services. Generally, you do not need to do anything if you use a third party web based or mobile Ethereum wallet. However, you should still check with your web or mobile Ethereum wallet provider to see what actions they are taking to update for the hard fork and if they are asking their users to take other steps.

In particular, you should ensure that transactions are generated with the new replay-protected EIP 155 scheme.

What do I do if my Ethereum client is having trouble syncing to the blockchain?

Make sure you have downloaded the latest version of your Ethereum client.

If you are using Geth or Mist, refer to this Ethereum StackExchange thread.
If you are using Parity, refer to this section of the Parity wiki.
Why are we proposing to hard fork the network?

“Spurious Dragon” is the second hard fork of the two-round hard fork response to the DoS attacks on the Ethereum network in September and October. The previous hard fork (a.k.a “Tangerine Whistle”) addressed immediate network health issues due to the attacks. The upcoming hard fork addresses important but less pressing matters such as further tuning opcode pricing to prevent future attacks on the network, enabling “debloat” of the blockchain state, and adding replay attack protection.

What changes are a part of this hard fork?

The following Ethereum Improvement Proposals (EIPs) describe the protocol changes implemented in this hard fork.

EIP 155: Replay attack protection – prevents transactions from one Ethereum chain from being rebroadcasted on an alternative chain. For example: If you send 150 test ether to someone from the Morden testnet, that same transaction cannot be replayed on the main Ethereum chain. Important note: EIP 155 is backwards compatible, so transactions generated with the “pre-Spurious-Dragon” format will still be accepted. However, to ensure you are protected against replay attacks, you will still need to use a wallet solution that implements EIP 155.
Be aware that this backwards compatibility also means that transactions created from alternative Ethereum based blockchains that have not implemented EIP 155 (such as Ethereum Classic) can still be replayed on the main Ethereum chain.
EIP 160: EXP cost increase – adjusts the price of `EXP` opcode so it balances the price of `EXP` with the computational complexity of the operation, essentially making it more difficult to slow down the network via computationally expensive contract operations.
EIP 161: State trie clearing – makes it possible to remove a large number of empty accounts that were put in the state at very low cost as a result of earlier DoS attacks. With this EIP, ’empty’ accounts are removed from the state whenever ‘touched’ by another transaction. Removal of the empty accounts greatly reduces blockchain state size, which will provide client optimizations such as faster sync times. The actual removal process will begin after the fork by systematically performing `CALL` to the empty accounts that were created by the attacks.
EIP 170: Contract code size limit – changes the maximum code size that a contract on the blockchain can have. This update prevents an attack scenario where large pieces of account code can be accessed repeatedly at a fixed gas cost. The maximum size has been set to 24576 bytes, which is larger than any currently deployed contract.

Any idea why the price of Ethereum dropped so much recently? Is that due to the second hard fork?

The Ethereum chain is about 45 GB at the moment. You can still put the folder in a SSD disk at present.

Augur will be good.

Stunningly accurate forecasts on any topic

Augur's prediction markets provide powerful predictive data - you can think of the current market price of any share in any market as an estimate of the probability of that outcome actually occurring in the real world. For example, a share priced at 64 cents has a 64% probability of happening.

The accuracy of prediction markets rests in the idea of the "The Wisdom of the Crowd". This states that the average prediction made by a group is superior to that made by any of the individuals in that group. Markets are the perfect way to aggregate this collective wisdom - which is made up of all the information, analysis and opinion held by members of the group. With these individuals buying and selling shares in the outcome of real-world events, based on their personal knowledge and opinion, the market prices reach an equilibrium that reflect the opinion of the entire group.

Prediction markets have proven to be more accurate at forecasting the future than individual experts, surveys or traditional opinion polling. They provide real-time predictive data and are traded using real money - which incentivises market participants to reveal what they think will happen, rather than what they hope will happen. Traders are putting their money where their mouths are.

The Chinese are the largest seller of the bitcoin at present. that is mainly from the Chinese miners as they have bills to pay.

Maybe the low volatility is good for the long term health of the coins. People will use it as a fuel for the smart contract.

It just mean the mining will be concentrated into cheap electricity places like China. It happened to the btc mining.

He was in the first steps of the DAO hack, but not in the later stages. He has no access to the DAO ETC.

I think the bitcoin price will not drop below $500. More and more people are using the bitcoin at the moment.

I like it:

"Same as we have always been doing, obsessing about security at every step of the design and implementation process. We knew very early that security was going to be the most important factor and have been building our entire stack around that maxim from the start."

that is right. The whales can determine the price and can push the price down so that there will be fewer miners.

So far, the halving is quite profitable. The price rose 40% in the last 40 days. But I am not sure if that is sustainable.

You can buy the bitcoin in exchanges, then transfer to your own wallet. Then hold it for the long term.

For the guys holding the bitcoin after the halving in 2012, their coin value increased 100 times then.

The halving could double the price in the medium term. So from now to end of the year, the price could double.

That is good for the adoption of Ethereum. Maybe the Ethereum will be more used than the bitcoin in the future.