HP Compaq Pro 6300 Hardware Reference Manual page 28

The DDR3-SDRAM SODIMMs must also:
support CAS latency 11 DDR3 1600 MHz (11-11-11 timing)
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contain the mandatory Joint Electronic Device Engineering Council (JEDEC) specification
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In addition, the computer supports:
1-Gbit, 2-Gbit, and 4-Gbit non-ECC memory technologies
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single-sided and double-sided SODIMMS
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SODIMMs constructed with x8 and x16 SDRAMs; SODIMMs constructed with x4 SDRAMs are not
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supported
NOTE: The system will not operate properly if you install unsupported SODIMM memory.
HP offers upgrade memory for this computer and advises that the consumer purchase it to avoid
compatibility issues with unsupported third-party memory.
22 Chapter 2 Hardware Repair and Upgrade