Howdy fellow steemians, Nex here!
How's it going everyone?
First of all, any miners are rushing for GPUS still? It seems cryptocurrency is bound to stay with us - Full Steem Ahead!.
We at PlainBroadcast are always reading and further researching cryptocurrency and mining info - as well as some other matters!
And in the last two days something has come to my attention - the RX Vega FE hashrate for ethereum
As of 30/06/2017 the Vega FE is doing only 30 to 35 mh/s at about 300W !
Hey Nex, but that's utter failure, my rx 580/1080ti/FlyingDinousaur is pulling of ~32mh/s for 140w !
While that is certainly true my attentive readers, I would like you to take the following arguments into consideration:
Core overclocking would probably make a big difference with Vegas, not memory.
While 33-35 mh/s looks like nothing today compared to other cards in the market in 6 months a lot of you would be very happy to get 33-35 mh/s - and the reason why is simple:
Currently overclocking memory on RX 480/580 makes a big difference because they don't have much memory bandwidth!
Although the DAG is currently small enough to fit in 4 GB of Vram, the memory bandwidth of these cards bottleneck what the GPU is capable of as of today.
As a result memory must be overclocked to prevent that bottle neck as much as possible - which puts a lot of stress on your gpu if you overdo it;
Therefore, the core can hash at a higher rate when memory is overclocked.
The memory bandwith is such a bottle neck that the core never reaches it's full potential and as such - unless you're dual mining) can be underclocked without impact to your Ether hashrate.
Since the DAG is growing and as a result needing more bandwidth, in 6 months from now (approximately epoch #199) RX 480/580 cards that are currently getting 29-30 mh/s will only get about 17 mh/s - you can panic later guys, still 5 months to go!
By contrast currently R9 290s don't see any benefit from overclocking memory -at least this is the case with factory overclocked cards.
But overclocking core does increase hashrate -from about 27-28 mh/s to 30-34 mh/s.
This is because the DAG isn't bottlenecked by the memory so overclocking core does make a difference.
Now get this. On epoch 199 a R9 290 will see its hashrate drop to about 20-22 mh/s.
However if you overclock the memory on them it'll go back to being about 29-30mh/s.
This is because the future DAGs will have enough impact on memory on these cards that overclocking it suddenly prevents the bottle neck and they hash faster - problem solved, eh?
Now Vegas have HBM2 memory which is very high bandwidth compared to GDDR5.
As a result overclocking it probably won't do anything notable - not today, and quite likely not in 6 months form now either.
This means that:
A) Since memory isn't acting as a bottle neck overclocking core will make a difference and give you a higher hashrate:
And also:
B) the DAG increase won't have much of an impact on Vegas hashrate despite significantly dropping most miners hashrate.
In a year from now even 290s hashrate will drop off a rock but Vegas may still be doing great.
So point is overclock core probably increases Vega hashrate substantially and it will likely withstand future DAGs far better than any card in the market.
Meanwhile what today sounds like a rip off for the price may in the future be an amazing bang for the buck.
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