Do not mix memory kits. Memory kits are sold in matched kits that are designed to run together as a set. Mixing memory kits will result in stability issues or system failure.
Memory kits will boot at default BIOS settings with compatible hardware.
Usage in any manner inconsistent with manufacturer specifications, warnings, designs, or recommendations will result in lower speeds, system instability, or damage to the system or its components.
Memory module height can be found in the FAQ, under the question "How tall are the memory modules".
For product support and related questions, please contact the G.SKILL technical support team via email.