No end result to compare them against so I opted for a side by side comparison.
As you can see it’s practically exact the same performance as far as I can tell which is great, it’s also worth noting that Windows 10 loaded each different benchmark scene a lot faster which is very welcome!
Windows 8.1 – Driver Revision 353.38
Windows 10 (Build 10162 x64) – 353.30
Recorded with Nvidia Shadowplay
Intel i7 4770k@4GHz
MSI GTX970x2 (SLi disabled for single GPU Benchmarks)