Note that CPU-ONLY can be made botnet resistant by increasing the memory requirement sufficiently, yet I am not aware of any Altcoin which does.
MemoryCoin and ProtoSharesMemoryCoin and ProtoShares can both be mined faster with a GPU and especially an ASIC, although if anyone has bothered to make a GPU miner for PTS then they are apparently keeping it to themselves:
https://bitsharestalk.org/index.php?topic=22.msg23874#msg23874https://bitcointalksearch.org/topic/m.4166700For MMC apparently the 2 - 3x limitation assumption on speedup of AES on GPUs from the above linked thread, is incorrect and 16x is theoretically possible:
https://bitsharestalk.org/index.php?topic=1958.msg22532#msg22532Primecoin and derivativesI am
doubting the entropic security of Primecoin. Also I doubt the security due to lack of botnet resistance.
Since Primecoin is compute bound it is
surely not FPGA and ASIC-resistant.
Also the 48X performance reduction logic on why it should be GPU resistant is incoherent and/or incomplete. The
claim is that modular exponentiation can't be parallelized (i.e. that the
internal and
recursive steps of a
single copy are serial), thus claiming a limit of 2 - 3X speedup. However that author did not respond to the
sound idea of running multiple orthogonal copies in parallel. I've sent that author a PM and hope he will respond in one of the threads. Note he didn't disappear, but
hasn't posted since the time the author of ReaperMine disappeared.
The 10X performance reduction logic relies on CPUs being 64-bit with
GPUs 32-bit. But GPUs have more FLOPs to throw at this and
some GPUs have some FP64 cores confirmed by
wikipedia but if these are
only floating point they may not be useful.
I've read that after
receiving 75 BTC, the developer of
ReaperMine appears to
have disappeared?
From what I've seen prime coin was demonstrated to not be faster than CPU mining with a GPU.
The above logic is that the ReaperMine GPU miner has probably not been properly designed and optimized yet to full potential, or it has and is being kept private. Even
the author stated the sieve portion needed to be improved to process more candidates as his implementation was underutilitizing the GPU.
What are
these people who purportedly donated 75 BTC to the developer of ReaperMine saying? Apparently he was using the
typical saleman trick of a time-deadline to induce more donations. He releases something half-baked then disappears $75,000 in pocket (if true). And
he reported having a private problem that was a
"rough patch in his life". Hmmm.