[Linux] [BOUNTY] How to lower core voltage (undervolting) of a MSI R9 280x?

[Hoshimaru]

4x MSI R9 280x SB38

Without Afterburner, without modded BIOS: 960 W at wall
With Afterburner, without modded BIOS: 820 W at wall (35 W less at each card)
Without Afterburner, with modded BIOS: 880 W at wall (20 W less at each card)
With Afterburner, with modded BIOS: Not possible to go under 880 W at wall because AB is already at its limit with the modded BIOS.

So... your BIOS may work but the watts have to be lower as 880 W when it is at 0.956 V. It should be about 40 watt lower for each card. Not only 20 W.


I will test the modded BIOS from kqpahv the next days.

Thanks for the feedback punkrock. I've got some feedback as well on litecointalk and will go back to the hexeditor, as no or little difference was measured, just like you're confirming. Hopefully somewhere this week when I find some spare time. I'll get back asap as I get something that effectively works

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[karkkis]

Hi, I have to clarify this thing to all.

I have 8x msi r9 280 x SB38, and I am planning to buy all that I can get my hands on.

YOU CAN UNDERVOLT IT VERY EASILY.

Use the techpowerup rom, http://www.techpowerup.com/vgabios/149729/msi-r9280x-3072-131011.html

undervolt to 0.943 V with VEB method. Only this volt works.

-Flash to legacy slot (the one closer to the hdmi ports-etc) using atiflash

- intensity 13, tc 8192, gpu speed 925 memspeed 1500, 100% reliable 24/7 for weeks.

You will get 650 khash and unbeliavably low 150w consumption. ( I have 3x rig which uses 560 WATTS altogether)

- You can easily put 4x in a 750w PSU (or 3 with 650 w PSU) , provided that you can have enough pci-e 6+2 connectors (a bit tricky with cheap PSU's, most gold 850w psus have enough connections)

- mine away....