Well...yes and no. Yes we can still mine with GPUs but on none of the miners I personally like, like ccminer and sgminer. However, no...because the move from ETHash to SHA3, depending on the number of variables, while it may still be profitable to mine, if they continue to have a low network hashrate.... attackers can still rent hashing power or invest their own. ASICs wont be online the moment the change happens, only GPUs and FPGAs. Network security will depend on us miners, and many are... if not already...losing faith in the project.
From ECIP-1049 proposal ([https://ecips.ethereumclassic.org/ECIPs/ecip-1049](https://ecips.ethereumclassic.org/ECIPs/ecip-1049)):
"**Keccak256** (aka **SHA3**) is the product of decades of research and the winner of a multi-year contest held by NIST that has rigorously verified its robustness and quality as a hashing algorithm...
In Solidity, developers have access to the **keccak256()** function, which allows a smart contract to efficiently calculate the hash of a given input. This has been used in a number of interesting projects launched on both Ethereum and Ethereum-Classic. Most Specifcally a project called **0xBitcoin** \[4\] - which the **ERC-918** spec was based on.
**0xBitcoin** is a security-audited \[5\] dapp that allows users to submit a proof of work hash directly to a smart contract running on the Ethereum blockchain. If the sent hash matches the given requirements, a token reward is trustlessly dispensed to the sender, along with the contract reevaluating difficulty parameters. This project has run successfully for over 10 months, and has minted over 3 million tokens \[6\]."
From ECIP-1049 proposal ([https://ecips.ethereumclassic.org/ECIPs/ecip-1049](https://ecips.ethereumclassic.org/ECIPs/ecip-1049)).
It was originally deployed on Ethereum using EIP918 developed by the 0xBitcoin community.
SHA3 is a mining algo, ETC is considering using SHA3. The only thing in common with 0xBitcoin is that they both use the same algo, which means that if ETC is more profitable to mine, 0xBitcoin will likely lose miners (especially when the upcoming halving reduces 0xBTC rewards by half).
Vindictive FUD from a person who doesn't like [this information I gathered](https://np.reddit.com/r/CryptoMoonShots/comments/i27fhk/0xmonero_summary_of_findings/) showing that the project he's associated with is fraudulent.
The ETC devs ASIC resistance is futile (Even though ProgPOW is meant for ASICs, just they're only 1.2x better than GPUs). So they decided on SHA3 with the idea that GPU will mine it at the start and ASICs will come online at a later(unknown?) date and simply push those GPUs miners off
How do they know they were attacked by gpus.
It seems more likely that they were attacked by hidden ETHash Asics as they can be produced for cheap these days. Do we have proof that the attack came from rented hashpower?
And if it is indeed ASICs that attacked them what is the point of adopting another ASIC friendly algo? They will be attacked again...