Do these states only matter if I ever put my computer to sleep? If I don't put my computer to sleep then do I not have to bother to go into the BIOS and tun it off? Because I have a Rosewill 630 Watt PSU 80+ bronze and I don't think it's haswell certified, but I want to build a haswell system soon.
C6/C7 Haswell sleep states.
- Thread starter RyanTH98
- Start date
lonewolf7
Splendid
- May 6, 2013
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Haswell's sleep power draw is substantially lower than that of previous generations, and it can trigger some PSUs' under-voltage protection and force a system reset.
According to Intel's presentation at IDF, the new Haswell processors enter a sleep state called C7 that can drop processor power usage as low as 0.05A. Even if the sleeping CPU is the only load on the +12V rail, most power supplies can handle a load this low. The potential problem comes up when there is still a substantial load on the power supply's non-primary rails (the +3.3V and +5V). If the load on these non-primary rails are above a certain threshold (which varies by PSU), the +12V can go out of spec (voltages greater than +12.6V). If the +12V is out of spec when the motherboard comes out of the sleep state, the PSU's protection may prevent the PSU from running and will cause the power supply to "latch off". This will require the user to cycle the power on their power supply using the power switch on the back of the unit.
So by disabling those states would serve you temporarily. And whenever the CPU is in idle state C6/C7 will kick in.
According to Intel's presentation at IDF, the new Haswell processors enter a sleep state called C7 that can drop processor power usage as low as 0.05A. Even if the sleeping CPU is the only load on the +12V rail, most power supplies can handle a load this low. The potential problem comes up when there is still a substantial load on the power supply's non-primary rails (the +3.3V and +5V). If the load on these non-primary rails are above a certain threshold (which varies by PSU), the +12V can go out of spec (voltages greater than +12.6V). If the +12V is out of spec when the motherboard comes out of the sleep state, the PSU's protection may prevent the PSU from running and will cause the power supply to "latch off". This will require the user to cycle the power on their power supply using the power switch on the back of the unit.
So by disabling those states would serve you temporarily. And whenever the CPU is in idle state C6/C7 will kick in.
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