Try 15.12 drivers on those cards, or 16.10.1 if you have to have newer for some reason. I've not tested 16.12.2 specifically but 16.12.1 was 5-10% slower on ALL of my testing vs the other 2 versions (16.9.2 was same speed as 16.10.1 but I prefer WQHL qualified versions when possible).

The U3 is an old, quite outdated design that hasn't been sold new for getting close to 2 years now (perhaps 3, I've lost track).

 The ONLY ones you will find are used from various sources, and they WILL use more electric than they will make in coin unless you treat them as a "lottery" type solo mining device and get VERY VERY lucky.

 They might be profitable if you find one VERY cheap and have free electric, but even that is iffy - depends on if they're likely to survive while mining for a decade or some such timeframe.

If you want to even break even on mining Bitcoin under current conditions, you need a recent design ASIC device - it hasn't been mineable for a profit with CPUs or GPUs for YEARS.

 Antminer S9, Avalon 721 are the current best options with a few more that are "in the works" or in early days of sales.

 If your electric is cheap enough, you might be able to get by with the Anminer S7 or Avalon 6 and still be able to make enough to pay them off before they become unprofitable.


 There are also quite a few "altcoins", some of which are quite profitable (for now at least) to mine with GPU-based rigs and a very few of which might be mineable with CPUs.


 Forget mining on a smartphone. Too much electric usage for almost NO coins mined, and they're not DESIGNED to be pushing the CPU that hard for any significant length of time.

Are you sure the second card is running at full clock?

 That looks more like the common "dummy plug needed on the second card to get it to not stay in idle mode 'cause Windows/Win Drivers are dumb that way" issue than any issue with Genoil's miner.

 (1) let it run for a while to get stable and full count for stats.
 (2) 215-220 ballpark is reasonable for a R9 280x from what I've seen.
 

 Humidifier(s) or an evaporative cooler (which is basically a large-scale humidifier designed to take advantage of the cooling effect of water vaporising)

 It IS a bit annoying having to manually fix that 50 to 25 every time I use the bitcoinwisdom calc - but it's still overall a good calc and VERY flexable.


 BTW - try that cal on 5c / KWH electric - there are a LOT of miners that don't pay 10c / kwh or even close specifically including most LARGE farms that are closer to 3 than 5.

 But most programs pay attention to the settings.

 One of my pair of R9 280x (both are the SAME model of Gigabyte Windforce card) gets very wierd unstable and unhappy at anything over -i 4 but runs reliably at that intensity.
 The other one will run at anything up to -i 8 but seems to give the highest reliable hashrate results at -i 6.


 My RX 470s were happy at -i 8 on v9.1 but got very crashy on v9.2 at same settings, dropped them to -i 7 and they're a lot happier - then moved them to v10 and they're still happiest at -i 7.
 (definitely not an inadaquate PS - that machine is running on a Seasonic X-1250)

I wish Blago's miner did NOT go automatically to upper-left-corner - why doesn't it go where the profile layout configuration TELLS it to go like almost any other Windows program?

 Upper left corner is THE VERY WORST PLACE you can put any console.

 Both the R9 280x and RX 470 cards I have are Hynix ram

 IMO go with sgminer by a wide margin over the Nicehash one, it has a lot better pool support built in already (the Nicehash one has to be modded to work with anything BUT Nicehash) and I personally prefer the interface quite a bit.

 I hope you're not counting any of the "merged mineable" coins like Doge in your 6.

 What did each of you use for difficulty increase?

 That makes a HUGE difference in ROI calculations.

 I believe you are required to install 3'd party miners to support some of the other algorythms.
 I've always done that on my NH installations, so not sure.

 NH also supports the Genoil ETH miner, if you don't like the double-whammy fees involved in running Claymore on ETH.

 IMO most folks are better off not running Nicehash at this point on anything but NVidia.

 What reason is there for a big price jump on ZEC?

 Have *ANY* major retailers started accepting it?

 I personally am shocked it's holding at double-digit dollars at all....


 Right now the only reason ZEC price ever "jumps" is whales doing pump-and-dump moves.

 Do keep in mind that the 1070 is ballpark $400 card, while the RX 470 are sub-$200 and many RX 480 are also sub-$200 though the average for the 480 seems to be closer to $220.

 Why is it a shock that a high-end high cost card can outperform a "mainstream" much lower cost card?

 The REAL comparison should be to the NVidia card in the same price range, the GTX 1060.

Pair of Sapphire ref-style RX 470, no bios mod

1250/1750/-75mv

 -i 7

Went from a little under 200 sol/s each on v9.1 to 233ish each on v10

Nice improvement from 9.2 on my dual R9 280x too - 380ish total to 417 (unhappy card at -i4 happy card at -i6)

 1100/1500 no bios mod


 211-221 sol/s for a single R9 280x is in the range I'm seeing on my pair.

 No version 16 drivers AFAIK support pre-GCN cards at all.
 15.12 should work with the HD 6450 - it works with my AMD A10-5700 APUs that are same-generation GPU units.

 ANY RX series card requires 16.x series drivers (I am not sure on the specific version, I *believe* somewhere around 16.4 is when support for the RX series was first added), as the 15.12 drivers predate the release of the RX series by a few months.