D3D12: Async texture creation disabled

I am trying to launch UE with D3D12, and I think it is success because I saw the following message in log file.

[2016.01.22-10.16.01:142][  0]LogD3D12RHI: Found D3D12 adapter 0: NVIDIA GeForce GTX 960 (Feature Level 11_0)
[2016.01.22-10.16.01:142][  0]LogD3D12RHI: Adapter has 3839MB of dedicated video memory, 0MB of dedicated system memory, and 12258MB of shared system memory, 1 output[s]
[2016.01.22-10.16.01:143][  0]LogD3D12RHI: Found D3D12 adapter 1: Microsoft Basic Render Driver (Feature Level 11_0)
[2016.01.22-10.16.01:143][  0]LogD3D12RHI: Adapter has 0MB of dedicated video memory, 0MB of dedicated system memory, and 12258MB of shared system memory, 0 output[s]
[2016.01.22-10.16.01:143][  0]LogD3D12RHI: Chosen D3D12 Adapter Id = 0
[2016.01.22-10.16.02:110][  0]LogD3D12RHI: Async texture creation disabled: no driver support

But in the last line says “Async texture creation disabled: no driver support”,
Does anybody know what is that means? Or there was something I missed to setting up?