8 pin or 12 pin options available.
8 pin or 12 pin options available.
Which power supply unit? I wouldn't run that CPU without the necessary power.
Assuming everything else is set, you only require the 8-pin EPS for the CPU. The additional 4-pin part is meant for heavy overclocking—something you can't achieve with ambient cooling. The 8-pin can deliver up to 384W of power, which a 9900K won’t reach unless pushed very hard. You’ll also need RAM. Updated July 23, 2020 by TofuHaroto
Avoid the extra 4-pin during overclocking a 9900K with ambient cooling. You'll hit thermal limits well before you approach the max of an 8-pin setup. Consider a fresh PSU for the ultimate configuration—CX600 is outdated.
The CX green models are known for their poor performance and general lack of reliability. Choose something with a higher chance of working.