Hey y'all,

So I've been suggesting to many people a power setup which includes a HP 1200w PSU for the PCI-e connectors and EVGA 650w GQ for the risers/mobo. Well it turns out the lower wattage GQ models uses inferior components to the 1000w+, as well as the G2 and G3 PSUs.

To get some more efficiency out of my setup, I installed a 30A 240V 60hz NEMA L6-30R outlet, and got a PDU for it it as well. The output voltage is in fact 240V according to multimeter, at the high end of what the PSU is rated for. Of all my PSUs, two 650 GQ's just died instantly, and one 650 GQ had some capacitors explode in fiery glory after 24hours (all died while not under load, and all worked fine previously at 120v). Luckily I could get the PSUs refunded. I also have a 1300w G2 running on this setup happily, as well as the HP Server PSUs. Because of price difference, shipping speed, and availability, I replaced the units with EVGA 850w G3's. These are running very happily.

Moral of the story, you can reduce the cost of your mining power by using server PSUs, but still make sure that you're getting a PSU whose quality matches the type of load it'll handle. It probably wont be an issue at 60% load 120v, but higher voltages or higher loads should guide you to better components.

Please thank new user atanas012 for sharing this!

Hello All.
I was able to get 6 x RX-500 series running on windows 10 x64. After two days the stupidest thing I tried worked  .
1. use DDU to clean the PC from any previous drivers.
2. Disable 4G decoding so you can log into windows (only  for Z170,H170, etc.)
3. Extract older driver for RX 400 series in Drive C: (I use 16.9.2 )
4. Extract driver for RX 500 series in Drive C: (I use 17.4.3)
5. Copy and replace all content from "C:\AMD\Non-WHQL-Win10-64Bit-Radeon-Software-Crimson-16.9.2-Sep21\Packages\Drivers\Display\WT6A_INF\B307117"  to "C:\AMD\WHQL-Win7-64Bit-Radeon-Software-Crimson-ReLive-17.4.3-Apr17\Packages\Drivers\Display\W76A_INF\B313057" (Basically you copy the old driver over the new)
6. Install the VGA cards manually from Device manager in Windows pointing path to the new driver 17.4.3 in this case.
7. Reboot and enable 4G Decoding in Bios
8. Enjoy if it works for you.

You can try with different driver versions if they work for you. I`m happy whit the 16.9.2 for the moment but any driver that works whit 6 and more RX 400 series GPUs should work  .

I know  that this solution sound stupid but it`s tested on 8 different rigs whit Asus Prime Z270-P and H270 Motherboards and works like a charm.
I`m pretty sure only handful of files need to be replaced but I don have the time to test more elegant solution.

Sorry for my English and grammar.

Confirmed working on my rig!

As the title implies. I've been working on this and I'm not making any progress.

0.15 ETH Reward: Give me the HEX location of a working voltage offset in my BIOS if it already exists
0.30 ETH Reward: Add a working voltage offset HEX to my stock BIOS if it does not already exist

Thank you guys for your help!

BIOS: https://ufile.io/uz4c6

So my Sapphire Nitro+ RX580 Limited Edition cards came in today, so I ran some benchmarks.

I first tried to find the highest error free memory clock for each memory strap and chose one that performs the best.
I followed this up by downclocking the core until the mining performance was noticeably affected if I'd gone further.
I then proceeded to reduce voltages as much as possible.

The trials and results can be found here:
https://drive.google.com/file/d/0B0CbyDF8Rhg5LS1CdldsUGs5OTQ/view?usp=sharing

I was able to achieve 29.3Mh/s at 77.5W as reported by MSI Afterburner and HWiNFO without any reported memory errors. After 1 hour, the card remained at 42 Celsius in a 72 Fahrenheit ambient room using only 40% fan speed. If power isnt an issue, the 1450 stock clock at 1.125V which can go higher would do great for dual-mining.

http://imgur.com/DnB9WH1

I have 6 more of these to play with, and I'm looking to reproduce these results. If anyone has any custom memory straps they'd like me to test just send me a PM (these use Samsung memory).

UPDATE:

After additional strap tweaking, I've gotten to 30.5Mh/s Eth. The card can dual mine 1450 Mh/s Dcr with no power limit, however by balancing power to hashrate, I get 1130 Mh/s Dcr (w/ 30.5 Mh/s Eth) @ 125W

UPDATE2:

The Nitro+ RX580 seems perfectly happy to run on just a single 8-pin power connector. However from my tests, this reduced hashrates by 1% and power consumption by 1% consistently The 1% drop seems to only have been temporary.