DDR3 vs DDR4
DDR3 vs DDR4
They need various processors and motherboards. What options do you have available?
5th gen Intel i5 7400 series ASUS H110M-K with 8GB DDR4 RAM, no integrated graphics.
During the Skylake period (2015-16) there were only a handful of unusual motherboards that could handle either DDR3 or DDR4 RAM (each with two slots). Since DDR4 was still emerging, many assumed people would stick with their existing memory. On these systems you couldn't combine the two types. The compatibility depended on both your motherboard and CPU. If you need 8GB of DDR4, consider adding another 8GB module of that type.
It seems unlikely you can use both types unless you have a special motherboard. You should stick to either DDR3 or DDR4, while DDR5 is newer. DDR4 works well and is common in most desktops today, with prices that tend to stay steady. For laptops, DDR3 has been more typical. Choose the highest rated speed with the lowest CL, but review them first. It might not be worth it if your needs aren’t met, and more GB can be useful for certain tasks.
The motherboard is limited to DDR4 support only. DDR3 cannot be installed.