The motherboard comes with on-board support for three PSU's. One for each group of PCI-E slots.

You mean this graphic?



That's just claiming a higher TOTAL hash rate from being able to use 19 cards on the same rig. The 407 MH/s is also actually pretty low, since it's only about 21 MH/s for each card.

More trouble than it's worth to create and maintain. GPU's manufacturer's change memory brand depending on what's available. From my experience, the higher tier models have a better chance than the entry level cards in having better quality VRAM.

With a RX 580 you should be getting 900-960 MH/s dual mining DCR. Try increasing the DCR intensity to 32.

Expanse is an Ethash coin, so it's the same hash you get for ETH. It's also at a lower epoch than ETH, so there is no Dag file hash drop and I believe it can also be mined with 2GB cards.

The profitablly is based on if you were to sell coins you already have at that very moment. Altcoin markets change quickly. Just because a coin is at the top when you start mining it, doesn't mean it will be when you have enough coins to cash out. Unless you run a farm where you can accumulate lots of coins to where you can cash out quickly to sell and buy other coins, all of which also involves fees, then in most cases you would be better off mining the coins you what to accumulate directly. Even if it's slighlty less profitable ATM, which also means the difficulty will be lower since there are less people mining it.

The best chance to maximize your profits from mining is to accumulate coins with good future potential based on the development roadmap and what they bring to the table. Mining the coins that everyone is mining because they are on the top of profitability for that day or hour is a shortsighted strategy, IMO.

For the most part, the motherboard makes no difference in a cards hash rate except where a GEN 3 PCI-E slot *may* make a negligible difference from a higher bandwidth over a GEN 1 or 2 slot. Which manufacturer claims a better hash rate from using their motherboard? AFAIK, what the mining motherboards claim is a higher TOTAL hash rate from being able put more cards on the same rig and a quicker ROI from not having to buy more motherboards, CPU's, RAM, hard drives and cases to have more cards.

You can expect the difficulty bomb to get ~30% worse on August 24th along with increasing block times and another difficulty ramp up on September 24th until the Metropolis release is pushed out, where the block times will go back to 15 seconds along with a reduction in the block reward to ~3 ETH.

Or use a Linux based OS. Lot's of videos on Youtube with 13+ AMD or Nvidia GPU's running under smOS or ethOS.

If your cards has two sets of memory timings you need to copy the 1500 MHz timing from both sets. Use 1:1500 strap to replace all the higher frequency 1: straps and the 2:1500 to all the 2: higher frequency straps.

You can mine just about any POW algorithms with GPU's. The problem with Scrypt coins is they haven't been profitable to mine with GPU's since ASIC's were developed years ago. Even with free power, you are still competing in an area where the difficulty is predicated by ASIC's and you won't be able to accumulate enough coins to make anything other than a few cents worth. With the cards in your budget, you can look at Ethash coins with a Dag size less than 2GB's, Equihash coins and maybe Monero as profitable coins to mine. You can also look at whattomine.com to get an idea what would be profitable with diffrent types of GPU's.

http://whattomine.com/coins

Best you could do with that budget is to see if you can get some used HD 7850 or similar 2 GB cards for ~$60 and a used motherboard to mine UBIQ or Musicoin. The HD 7850 gets ~19.5 MH/s on Ethash. Only problem with 2 GB cards is you can't dual mine.

The 1750 MHz timing strap mod is only for cards with Samsung memory. I have a Nitro+ RX 570 4GB card with Hynix memory. I copied the 1500 MHz strap to the higher timings and get ~29 MH/s UBQ and 760 MH/s DCR dual mining. I use an overclock of 1150 MHz core clock 2075 MHz memory clock with a -96 mv undervolt and -10% power limit in Afterburner.

That's right and and on Aug 24th the difficululty bomb is going to get ~30% worse, in addition to increasing block times.

https://www.youtube.com/watch?v=R_943As7WMg&feature=youtu.be&t=341

That was the info BBT gathered from the last Ethereum dev metting on 08-11.

https://www.youtube.com/watch?v=i8tSXTqJVxQ&feature=youtu.be&t=2712

Just wait until the ~30% ice age difficulty ramp up on 08-24. An average 6 card rig will make less than 0.5 ETH a MONTH!

As expected, the 17.8.1 driver DOES NOT incorporate the Dag epoch hash drop issue fix from the beta blockchain compute drivers. So at least for now, if you care about mining ETH, stick with the beta blockchain compute drivers. Mining UBIQ which is not affect by the epoch hash drop issue had no difference in speed between the two drivers.

https://bitcointalk.org/index.php?topic=2092279.msg20905036#msg20905036

The Dag size is not an issue for 4GB cards. Even 3GB cards will be OK until November 2018 and the Dag size won't reach 4GB until something like 2020. ETH will move to POS long before that.

A 30 sec search provided this link.

https://bitmakler.net/Nexus___mining