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My System:
Windows 10 Pro x64.
AMD blockchain Aug11 drivers.
Rig: 6 cards ,three RX480 & three RX580.

I'm sure this has been asked before but can't find any post about it, so here goes..
I've not been messing with the voltages on my GPUs until now, and am trying to use Wattman to adjust the voltages but they don't look like they are changing (or at least not past a certain voltage as I do see a drop in the rig Wattage use).
When monitoring with GPU-Z (or HWinfo) the voltages do not change (I see a dip then it jumps back up) - I have a Windows 7 x64 setup running the 17.7.1 drivers and the volages do change on that setup (as seen in Afterburner & GPU-Z).
Is it not possible to change the GPU voltages with the new AMD blockchain drivers ?

I've changed to mining Monero (with the Claymore XMR miner) so do I really need the new blockchain drivers for Monero and if not can I re-install the 17.7.1 drivers to enable voltage changing - I hate changing the drivers as something always gets screwed up ?
Thanks.

Blockchain drivers don't work with Windows 7 and Claymore.

I've installed the blockchain drivers on Windows 7 and ran Claymore on top of that and it works just fine.
Maybe I did not make it clear, my main rig is running Windows 10 (this is the one I'm having problems with), and I've a small rig running Windows 7 (which now has 17.7.1 on it but used to have the blockchain drivers and Claymore running just fine)

Then you are the only one on here so far who has gotten Windows 7 + Blockchain + claymore to work, the rest of us have claymore crash apon GPU access

I had 6 various rigs running Win 7 with amd and Nvidia.... had to install Win 10 on all of them to use blockchain driver.... reluctantly did this after days of troubleshooting and dozen hours of trial and error.... 6 different mb's and various mix of gpus.... none of the win7 rigs would run blockchain driver with claymore...... miner would open and start and then close. I have not seen anyone on this thread with a successful blockchain driver working on Win 7 with claymore but quite a number of people posting their lack of success.

Previos beta (not official) works fine with Win7.

Thats robinh00d version which is an unofficial patch that works in Win 7. We are waiting for something more concrete on the official front.