Yes — compatible: 16GB DDR4 (1x16GB) with Z690. Z690 boards ship in DDR4 and DDR5 variants — make sure your specific board is a DDR4 model. Live eBay prices.
✓ Memory compatible
How they line up
Spec
Z690
16GB DDR4 (1x16GB)
Socket
LGA1700
—
Memory
DDR4 or DDR5 (board variant)
DDR4
✓
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16GB DDR4 (1x16GB)
Z690
Common questions
Z690 boards ship in DDR4 and DDR5 variants — make sure your specific board is a DDR4 model.
Z690 boards exist in both DDR4 and DDR5 versions — the chipset supports either, so check the specific board model before buying memory.