From a past post:
"Our tests demonstrate fairly little difference between a $225 LGA 1155 Core i5-2500K and a $1000 LGA 2011 Core i7-3960X, even when three-way graphics card configurations are involved. It turns out that memory bandwidth and PCIe throughput don't hold back the performance of existing Sandy Bridge-based machines. "
You shared the board and we also know there's little difference on PCIe 2 and up but the CPU can matter (NOT A GPU BOTTLENECK ISSUE!!) on some games.
So if your PC has the slot, space and power supply to support this, I would go for it.
So my mother board is a GA-B85M-D2V and im wondering what is the best graphics card i could get without bottlenecking the gpu. Im looking at a MSI GeForce GTX 1060 6GB 6GB GAMING X Video Card but not sure if my motherboard support it