Yes, you can use 2x4GB and 2x8GB RAM sticks together in a computer as long as they are compatible with your motherboard. However, it is important to note that the system will only utilize the amount of RAM specified by the smaller sticks (in this case, 4GB). Mixing different sizes of RAM can sometimes cause compatibility issues, so it is recommended to use RAM sticks of the same size and speed for optimal performance. **

Yes, using RAM sticks with different speeds and timings together can have an impact on performance. The system will run all the RAM sticks at the speed and timings of the slowest stick, in this case, the 3200MHz C16. This means that the 3600MHz C18 RAM will be underclocked to match the slower speed and timings, potentially reducing overall system performance. It's generally recommended to use RAM sticks with the same speed and timings for optimal performance. **

You can combine DDR3 2x4GB with 2x8GB by installing the 2x4GB modules in one channel and the 2x8GB modules in the other channel of your motherboard. This will allow the memory to operate in dual-channel mode, which can improve overall system performance. However, keep in mind that the memory will only operate at the speed and timings of the slowest modules, so it's important to ensure that all modules are compatible and have the same specifications for optimal performance. **

It is generally better to have 2x8GB RAM compared to 1x4GB and 1x16GB RAM configuration. This is because having two identical RAM sticks allows for dual-channel memory, which can provide a slight performance boost compared to a single-channel setup. Additionally, having 16GB total memory is more beneficial for multitasking and demanding applications compared to having only 12GB. **

Yes, 2x8GB 3200MHz RAM is suitable for the i5 12400F. The i5 12400F supports DDR4 RAM, and 3200MHz is a compatible speed for this processor. 16GB of RAM is also a good amount for gaming and general multitasking, so this configuration should work well for most users. Just make sure to check the motherboard's compatibility with the RAM speed and capacity as well. **

It depends on the specific requirements of your computer and motherboard. If your motherboard only supports DDR3 RAM, then you should use 4x4GB DDR3 RAM. However, if your motherboard supports DDR4 RAM, then using 2x8GB DDR4 RAM would be a better option as it allows for potential future upgrades and generally offers better performance. Additionally, DDR4 RAM is more energy efficient compared to DDR3 RAM. **

The main difference between 2x8GB RAM and 4x4GB RAM is the total amount of memory. 2x8GB RAM configuration will give you a total of 16GB of memory, while 4x4GB RAM configuration will provide a total of 16GB as well. However, the number of physical memory modules is different, with 2x8GB using two 8GB sticks and 4x4GB using four 4GB sticks. The 2x8GB configuration may be more cost-effective and leave room for future upgrades, while the 4x4GB configuration may offer better performance due to the additional memory modules. **

The main difference between 2x8GB RAM and 1x16GB RAM is the number of physical memory modules used. 2x8GB RAM means two separate 8GB memory modules are used, while 1x16GB RAM means a single 16GB memory module is used. In terms of performance, using two memory modules (2x8GB) allows for dual-channel memory operation, which can provide a slight performance boost compared to a single module (1x16GB) in certain applications. Additionally, having two modules allows for easier expansion in the future by adding more memory modules. **