adobe premiere playback lag Having some trouble with video playback. Was wondering if anyone has settings suggestions to help solve the problem. Just trying to play the project in premiere lags even with the resolution downgraded. Any suggestions would be great.

Computer specs:


Intel Core i7-5820K running @ 4,124 MHz, logical processors 12
2x GeForce GTX 980 cards 4,096 MB in SLI   
Memory 32,768 MB @ 2,332 MHz
64-bit Windows 10 
M.2 512GB


Video files: 60 fps @ 4096x2048 uncompressed 

Nothing spikes, memory runs low and has about 28.9 gigs allocated, processors run low, video cards run low in mem and processors, using mercury. I'm guessing it's some settings that are causing it. I know I'm not using a quarto card which has better drivers for this type if thing ( video drivers are updated ).

Any advice is appreciated,
Thanks!
Uncompressed 4K video at 60fps requires your playback system to deliver approximately 2GB/sec (or more than 15 Gbps).  You can use Blackmagic Design's Disk Speed Test (part of the Desktop Video bundle you can find here) to see whether your system meets this criteria.  If it does not, then you'll need to compress your video until you have a bitrate that your IO system can actually support.