TDP is an acronym for Thermal Design Power. This is the recommended design target for power used when designing the cooling capacity for a server.
The EPYC processor is able to control this target power consumption within certain limits. This capability is referred to as configurable TDP or "cTDP". cTDP can be used to reduce power consumption for greater efficiency, or in some cases increased above the default value to provide additional performance.
cTDP is controlled using a BIOS option, and manufacturers may impose limits other than the default for the EPYC processor based on the power limitations of each platform.
The available cTDP ranges for each EPYC model are below:
Model - Nominal TDP - Minimum cTDP - Maximum cTDP
EPYC 7601 - 180W - 165W - 200W
EPYC 7551 - 180W - 165W - 200W
EPYC 7501 - 155/170W - 135W - 155/170W*
EPYC 7451 - 180W - 165W - 200W
EPYC 7401 - 155/170W - 135W - 155/170W*
EPYC 7351 - 155/170W - 135W - 155/170W*
EPYC 7301 - 155/170W - 135W - 155/170W*
EPYC 7281 - 155/170W - 135W - 155/170W*
EPYC 7251 - 120W - 105W - 120W
*Max TDP is 170W when DDR4 is operating at 2667 MT/sec, or 155W when DDR4 is operating at lower frequencies.