This is my second rig:

TB85 Biostar MB
EVGA 1000 Gold PSU
Typical other settings/parts
Windows 10 Pro

My first rig was Sapphire 8GB cards and I got them up to 28Mh/s and 870 Watts. The problem with these XFX rx480 4gb cards is that they will not OC, will not respond to ATIWinflash or ATIflash from within Windows. I get the following message when I open ATIWinflash, "Cannot find discrete ATI video card."

I tried to force flash using ATIFlash command line. I also unlocked the cards. Both seemed to complete without error. But I can't flash the cards. I have Elipda and Hynix memory between the 6 cards if that matters. I am only getting 22Mh/s per card which obviously isn't very good.

The only thing I didn't try was using a bootable USB and flashing from there. I have a guide that describes it but I have also heard that it doesnt work so I dont want to waste my time and possibly brick them.

How can i flash these buggers?

Figured it out. I used myetherwallet and loaded in the encrypted UTC file and was then able to send back to exodus

I wanted to test out the edgeless.io beta Blackjack so I sent 5.22 ETH into the wallet I generated for the purpose. Sent yesterday, plenty of confirmations, yet the eth balance is still 0. I did a bit of research and I think this has happened before between the ethereum network and the non-real test net. Does anyone know how to remedy this? I have the correct password for the address in edgeless.io but no ether is showing.

Thank you for your replies. What I did was installed this older driver: 16.11.3-nov8. Then I disabled automatic driver updates on windows and through AMD. Followed the BIOS settings posted by z92747392. And then the final trick was this. I tried from the beginning with just my one card plugged into the PCIex16 slot. Booted up and noticed it hung at Windows load as usual but I decided to let it do its thing. After the screen turned on and off like 6 times, it stopped and it was stable and this was the first time I had a card be read from this slot. I then restarted with 2 cards, then 3 and onwards until all six. Then I was getting a BSOD.

I uninstalled the AMD drivers and rebooted. I plugged in the last card just to see, and it was recognized by Windows. I then used the AMD cleaner utility and then installed 16.9.2 from guru3d. Unbelievably it now works. Getting about 24m/hs on ethereum and 4400 on decred.

So I guess it boils down to installation methodology. For this board, that driver works. You should install windows 10 with all 6 cards attached and use that driver. Would have saved me a day, but oh well.

On to overclocking! Please share if anyone has a good writeup. The one I found was for the nitro + which I do not have. I have the nitro 8gb non plus (samsung though).

Just built my first rig.
 
Kingston SSD 120GB
Biostar TB85 1150 mobo
6x RX480 Sapphire Nitro 8GB graphics cards
Deep in the mines frame with usb risers
EVGA 1300W Gold PSU

So here is the deal. I had a legit version of Windows 7, upgraded for free to windows 10. Started from there with installation of drivers. No matter what I have tried, if I plug one of the risers into the big PCIEx16 slot, the system will not load, no POST message, no signal sent to the screen. If I plug in a card to the PCIEx16 slot while windows is on, it crashes.

I have tried switching to gen 1 and gen 2 on the mobo BIOS. Switching a card I know works to this PCIEx16 slot. Just running the PCIEx16 slot and not the smaller ones. Tried a few versions of AMD drivers.

For what its worth, all 5 of the cards will have their fans stop right before windows loads to the desktop, then they kick back on. Almost like the system won't load until the fans stop. Claymore dual is working fine with Decred and Eth, but I don't dare mess with OC'ing these things until the 6th card works.

I am powering the rx480's with cords direct from the power supply unit. The risers are being powered by cables that I also attached to the PSU. The only thing I could think is that I have only 1 AUX power cord plugged into the board, the second doesn't fit next to one of the PCI slots.

Please let me know hat else I can try to use my 6th card.

EDIT: Actually randomly after a reboot, only 4 are found now and the 4th is hashing at a measly 4 m/hs. Ugh

So I decided to experiment and so far I have not gone bankrupt. Investment was 17mBTC and I have not gone above 6 consecutive losses. I am betting a microscopic amount and 17mBTC covers martingale increments up to 7 times. Hesitant to try more money but so far I have done about 30,000 bets. Playing under 82, wagered 6mBTC and profit is .25. The math works out to about $1.00 -$1.50 in profits per day at this rate. I'm not playing with the martingale increment of 8 times like I want but rather 6. 8 Times doesn't ensure that I can cover 7 consecutive losses. However, if this does work, then in theory I could add money and keep playing so that each bet was larger and profits should increase. However, I would imagine that to make 100 times my .25mBTC would take 100 times the bankroll. 1700mBTC. To make 25 per day is a decent amount of money but thats also a lot to risk losing. I will have to see if this bet experiment goes beyond 7 consecutive. I have definitely seen 6.

Like I was saying though, a large enough bankroll seems like a plausible way to insulate from bankruptcy but there is no guarantee you won't get 15 losses in a row I guess.

Been reading on this forum and elsewhere a bunch about how martingale doesn't work, and I get why with a game like craps or roulette. But I was hoping to have a discussion around a particular game.

Say you have a very large bankroll of 1,000,000usd in this example. You bet .000001 mBTC set on autopilot. You say, less than 80 is a win. So you have about a 79% chance of winning each spin. You win about a fifth of your bet on each spin. On each loss you increase your bet by 6, which covers the loss and earns you a small amount. After a win, the bet returns to original.

What I'm trying to wrap my head around is what the odds are of rolling enough losing spins in a row to lose your massive bankroll. Let's take the million in the example, we increase the bet after each consecutive loss by 6:
.000001
.000006
.000036
.000216
.001296
.007776
.046656
.279936
1.679616
10.077
60.46
362.79
2176.78
13k
78k
470k


So what are the odds then of losing 16 times in a row when any singular spin has about a 79% chance of winning? I get that each spin is independent of the next and is referred to as the "gamblers fallacy" but it seems like losing 16 times in a row is a very small probabaility when singular spins are 79% in your favor.

In experiments, I see three losses in a row with some regularity, 4 too. 5 and 6 are very rare.

Someone tell me what I'm missing here. Seems like you could win if your bankroll was large enough to basically work outside of the very unlikely trend of losing so many times in a row. Sure maybe after a long enough time of doing this you would lose but shouldn't this work if you just slam the game with a big bankroll and then stop?

I see this as materially different than playing a hi/lo 50/50 game since you have no odds in your favor but rather a coin flip.