CPU Cstates (C1,C3,C6,C7) & SSD performance

[poohbear]

Hey all, is there any truth that the CPU states (C1, C3/6) effect SSD performance?(negatively) Ive read on some SSD guides that they should be disabled to maximize SSD performance. I own a 4790k Haswell, and i figured with the latest generation of CPUs Intel has figured out how to do CPU states without effecting SSD performance. Is that true? I own 3 SSDs and wanna maximize performance for all of them.

Any feedback would be greatly appreciated.

 

[BonzaiDuck]

Hey all, is there any truth that the CPU states (C1, C3/6) effect SSD performance?(negatively) Ive read on some SSD guides that they should be disabled to maximize SSD performance. I own a 4790k Haswell, and i figured with the latest generation of CPUs Intel has figured out how to do CPU states without effecting SSD performance. Is that true? I own 3 SSDs and wanna maximize performance for all of them.

Any feedback would be greatly appreciated.

I can only report what I know with my old ASUS Z68 motherboard (in sig rig). When I ran the Samsung benchmark on my 840-Pro SSD under the conditions of RAPID and without RAPID, I had the C-state features of the board enabled. The benchmarks didn't seem any different than what others reported or what you'd expect from the specs.

 

[ShintaiDK]

Never heard or observed it should affect SSD performance in any way.


Also lots of semi bogus SSD guides out there.

 

[poohbear]

hmmm, yes i tried both and didn't notice a difference in real world performance. guess its just benchmarks.

 

[coffeejunkee]

It might be true for some ssd's, iirc Corsair recommended it in one of their guides. Stuttering was mentioned as a problem that would be solved. But I would blame the ssd instead of C-states.

The problem is if you disable C-states you lose turbo boost. Might not be a problem for an overclocked desktop rig but in a laptop this could severly hamper cpu performance.

Plus you lose out on some nice power saving.

 

[BonzaiDuck]

It might be true for some ssd's, iirc Corsair recommended it in one of their guides. Stuttering was mentioned as a problem that would be solved. But I would blame the ssd instead of C-states.

The problem is if you disable C-states you lose turbo boost. Might not be a problem for an overclocked desktop rig but in a laptop this could severly hamper cpu performance.

Plus you lose out on some nice power saving.

Perhaps it's an "eye-of-the-beholder" thing. Once I was able to get an amazing over-clock configuration with EIST enabled, I variously tried disabling the C-states before finding "true stability." It didn't matter much for stability, and I liked the ability to avoid running my computer at load-voltage plus vdroop continuously.

 

[JoeRambo]

If you have Z87/Z97 you can look @ Dynamic Storage Accelerator option in BIOS and Intel RST drivers. It supposedly can help with power saving options getting in the way of I/O performance.