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Haswell C6/C7 states and OC Voltages

Joe223
Level 7
Hey guys!

Before I bother you all I should mention that I'm a bit of a newbie when it comes to this kind of stuff, so I hope you can bear with me for a bit 🙂

That said, I have a few questions:

1. I noticed that some of my motherboard's (Maximus VI Hero) bright-red LEDs stay lit even with the computer off. Should I turn the PSU off overnight or is it alright for longevity this way? I've been leaving it on.

2. My CPU is at a rock-solid overclock with XMP enabled. Basically, I just turned up the multiplier to where I wanted it and then cranked up VCore slowly in manual mode until it was stable, then switched over to adaptive and XMP. I'm pretty sure my VCore is safe at well below 1.3, but should I tweak other voltage settings (VCCSA, VCCIO, Input, Cache, etc) or is it alright to leave them at auto if temps/stability is acceptable? I am looking primarily to maximize CPU/hardware life with this OC and had to wonder if auto rules would increase certain voltages to higher-than-nominal levels after having learned about how synthetic tests can draw a lot of VCore while on adaptive.

3. Should I enable C6/C7 states for my Haswell given that I'm running a significant overclock? Are there any known performance/stability drawbacks? I have a Haswell-ready PSU and the UEFI C states setting is on 'Auto'. As it is now, my CPU drops to as low as 800 MHz at around 0.965VCore with adaptive.

Many thanks for any help! 🙂
29,461 Views
4 REPLIES 4

HiVizMan
Level 40
The leds on is just fine.

You have no need to change any voltages as your system is happy just as is.

Nope leave things as they are for now with regard to C states.

Enjoy
To help us help you - please provide as much information about your system and the problem as possible.

Chino
Level 15
Joe223 wrote:

1. I noticed that some of my motherboard's (Maximus VI Hero) bright-red LEDs stay lit even with the computer off. Should I turn the PSU off overnight or is it alright for longevity this way? I've been leaving it on.

If you decide to disable them or if they bother you, you can find the option in the ROG Effects section under the Advanced tab within the BIOS.

pennyboy
Level 9
Hey Joe, enjoy your board mate!! the HERO is very nice!!

31852

Here is what i have been using as a reference for c states. I ended up just leaving it at auto.
4770k | Asus Hero | G.Skill Trident 2400 32gb | Samsung 840 pro 256gb
NZXT Kraken x60 | Asus GTX780 Direct CU ii OC | Razer tiamat 7.1
Razer Imperator | Razer Nostromo | Antec High current pro 850
Thermaltake Xaser Vi | Windows 8.1 64bit