dont worry about it, gddr5 on your gpu isn't the same thing as ddr3 on your motherboard. also, its Gddr5. you can run gddr6 on a ddr2 motherboard, problem is the cpu on the motherboard will bottleneck the gpu
I'm about to have the exact same thing, DDR5 Nvidia GTX 1050 on a PCIE 3 DDR3 motherboard. And I'm just curious, what differences are in terms of performance? Will the GPU show less potential then what would be with DDR5 motherboard?