Undervolting R9 cards, which versions work best?

[PeaMine]

I ended up buying a mixture of 390 cards a while back, only to realize it seems none of them support undervolting (Tried MSI Afterburner and Trixx)
I have an old R9 290X Reference card back when Litecoin mining was hot on them.  It can undervolt -100 and works amazing, in this heat it's as good as my 390.
What cards do you use that you can undervolt?  Is there a custom bios for the 390s that allow this?  I'm also interested in the 400 series, seems they all can be undervolted?

[Mzie]

I ended up buying a mixture of 390 cards a while back, only to realize it seems none of them support undervolting (Tried MSI Afterburner and Trixx)
I have an old R9 290X Reference card back when Litecoin mining was hot on them.  It can undervolt -100 and works amazing, in this heat it's as good as my 390.
What cards do you use that you can undervolt?  Is there a custom bios for the 390s that allow this?  I'm also interested in the 400 series, seems they all can be undervolted?

i undervolted my R 9 380 its efficient,low power consumption

[PeaMine]

Is there a list or a way to tell if an AMD card can be undervolted before buying it?

[philipma1957]

Is there a list or a way to tell if an AMD card can be undervolted before buying it?

no but  you could buy mine


https://bitcointalk.org/index.php?topic=1579698.0


all are the same and they all under volt.


and you  could get then new from best buy


http://www.bestbuy.com/site/xfx-amd-radeon-r9-390-8gb-gddr5-pci-express-3-0-graphics-card-black-gray/8278117.p?id=1219690434699&skuId=8278117


if you use  amd 16.7.2  and claymore miner they  will do 27-30 mh with undervolt.

the amd settings have overdrive  for r9's and wattman for rx 480s