Likely a bottleneck from the CPU. Heck, my 1070 almost bottlenecks my I7-4770. It takes it to over 80% usage in all cores. I'm almost glad I didn't go for the 1080, because I might have been CPU bottlenecked. I also don't think I could run SLI with an I7-4770. If you cannot upgrade that CPU, you wasted your money on the 1070.