Gigabyte B450M DS3H with Ryzen 2700
I checked the QVL of the motherboard and there are not many memory options available. These are the 32GB memory kits that I see on that list:
Tested for DDR4-3000
- HyperX 16GB 2Rx8 HX430C15PB3K2/32
- CORSAIR 16GB 2Rx8 CMU32GX4M2C3000C15R
- CORSAIR 16GB 2Rx8 CMU32GX4M2C3000C15
- CORSAIR 16GB 2Rx8 CMR32GX4M2C3000C15 ver4.31
Unfortunately the Gigabyte B450M DS3H does not have great memory compatibility, so you can expect memory speeds of DDR4-3000 and below. It also depends on how good the quality of your processor's IMC and silicon lottery applies.
Since nothing is guaranteed, go for an affordable DDR4-3200 32GB kit with CL16 timings. Then try to make it run as fast as possible (while remaining stable) by tweaking the voltages and timings. You can use the Ryzen DRAM Calculator tool to input the recommended timings and voltages.
Ryzen DRAM Calculator
AMD Ryzen Memory Tweaking & Overclocking Guide
-- edited by sleepygeepy on Feb 12 2020, 02:35 AM