You didn't list the rest of your system, especially CPU...
But according to Wikipedia
The DDR3 standard permits DRAM chip capacities of up to 8gigabits(Gbit), and up to fourranksof 64 bits each for a total maximum of 16 gigabytes(GB) per DDR3 DIMM. Because of a hardware limitation not fixed until Ivy Bridge-E in 2013, most older Intel CPUs only support up to 4-Gbit chips for 8 GB DIMMs
Given the mobo it seems your CPU is older than that so likely won't support 16GB DIMMs.
Not to mention they are rare and expensive, and it wouldn't make much sense spending >3 times what the same amount of DDR4 costs into an obsolete platform, makes more sense to replace the whole thing, you can probably find a newer used mobo/CPU just for the difference in RAM price.