This is me killin it on Ubuntu 16.04 w/ 6x MSI rx470 4GB
[14:31:16] Thread 3, GPU ID 3, GPU Type: Ellesmere: 635.87H/s
[14:31:16] Thread 2, GPU ID 2, GPU Type: Ellesmere: 634.97H/s
[14:31:17] Thread 5, GPU ID 5, GPU Type: Ellesmere: 641.74H/s
[14:31:18] Thread 1, GPU ID 1, GPU Type: Ellesmere: 644.15H/s
[14:31:18] Thread 4, GPU ID 4, GPU Type: Ellesmere: 641.23H/s
[14:31:18] Thread 0, GPU ID 0, GPU Type: Ellesmere: 641.01H/s
[14:31:18] Share accepted: 72/72 (100.00%)
[14:31:18] Total Hashrate: 3838.97H/s
BONUS --> Only 640w total draw at the wall... (custom bios 1160core/1900mem/1500straps)
How are you modifying your bios? You just going into UEFI boot and changing the options? I'm new to this obviously.
Core 1160 = gpu core clock rate?
Mem = memclock rate?
What is straps?
Also, have you tried undervolting the gpu's or is it possible on ubuntu?
I have 2 unmodded sapphire rx480's running at 577H/s
"threads": 1,
"rawintensity": 1024,
"worksize": 8
Bios Mod.
- dump stock rom with gpu-z
- open in polaris, change core clocks, mem clocks, and set all straps above 1500 to the 1500 strap.
- save and write new rom to card with atiflash.
You can learn alot about it over on Zcash forms. Search Anoraks VBIOS.
I have no done any undervolting (yet). You cant do that directly in ubuntu against the amdgpu-pro drivers. You can only change core and mem clocks on the fly using the /sys/class/drm/* stuff.
I'm thinking @ 650w TDP, do I really risk stability to save a few more watts?
For MSI RX470 4G, I'm using..
{
"index": 1,
"threads": 1,
"rawintensity": 960,
"worksize": 8
}