The CPU while dated isn't the bottleneck here.
""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. "
So while I wonder why the 4GB video card over say a 290, you can easily find benchmarks for games on the 270.
Be sure to keep it clean (canned air) and replace that heat sink compound. Why? Example at:
Hello everyone. i have a question. is my computer good for gaming?
My specs are
intel i7 870 processor
Radeon dual-x r9 270x 4gb gddr5 graphics card
750 watt corsair power supply
Precision T1500 motherboard (i think)
let me know if i forgot to mention anything.