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Document ID Number: 328209 003EN Intel

Xeon Phi™ Coprocessor Datasheet

Coprocessor C1 state gates clocks on a core-by-core basis, reducing core power. On the

active SKU, the fan slows to an appropriate speed, reducing fan power. If all cores enter

C1, the coprocessor automatically enters Auto-pC3 state.

If clock-enable input to memory is pulled high, then memory enters M1 state which

reduces memory power.

Figure 5-2. Some cores are in C0-state and other cores in C1-state; Memory in M0-state

C1 - Halt

(clocks

gated)

(Full on)

Full bandwidth enabled

M0 M0 M0 M0 M0 M0

Fan

<100%

Figure 5-3. All Cores In C1 state; Memory In M1 state

Full bandwidth enabled

M1 M1 M1 M1 M1 M1

C1 - Halt

(clocks

gated)

Fan

<100%

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