I just recently switched back to OBS from shadowplay when I found out it has the replay buffer.
OBS using NVENC does create a load on both cards.
For example, I have a 760 and a 750ti.
Using GPU Shark, recording or using the replay buffer the GPU on the 760 rises 10-15% while the 750ti rises 3%.
The 760 has a monitor connected and is used for gaming/recording/etc, the 750ti has nothing connected and is used exclusively for altcoin mining, or if a game has Physx, I have it using the 750Ti.
OBS is doing something with the 750Ti, which normally isn't a problem, but some altcoins max out the 750.
When this happens OBS performance drops,excessively stutters and displays a 'High encoding' warning.
In game frame rate is unaffected by any of this.
Being able to select and force OBS to use just the one card would be great.
Or as mentioned above, if OBS is only supposed to be using the card the game is running on, if it's use of the non-gaming card could be fixed. (So perhaps a bug report rather than a feature suggestion?)
Thank you