Quote:
Yeah. I'm not arguing with you, just telling you what I saw. Posting all those quotes isn't going to change what I saw with my board. :shrug:Originally Posted by opt33Â 
SeanPoe did a thorough testing on his, found similar results, actually C states hurt his read speed more than on mine in some cases.
http://www.overclock.net/t/1262255/effect-of-power-saving-features-on-ssd-speed
And another with Gigabyte mobo that apparently contacted Gigabyte about it, complaining of C states affecting SSD
http://forums.anandtech.com/showthread.php?t=2192825
http://www.tomshardware.com/forum/298896-30-asus-p8z68-gigabyte-z68x-ud3h
http://www.xtremesystems.org/forums/showthread.php?273312-What-is-going-on-with-SSD-in-DMA-mode&s=8378edb311d0b02cba86b742aafc1237
speaking of his Crucial M4 SSD in both modes...
http://gskill.us/forum/showthread.php?t=6724
Toms articles first wrote about it back in 2009 and several threads across different forums of people confirming same back then.
toms articles is here: http://www.tomshardware.com/reviews/ssd-hdd-power,2170-4.html
their conclusion:
Test 1) 4.7ghz, C states OFF, Vcore fixed, LLC turbo.
4700_Coff_manualvcore.jpg 389k .jpg file
Test 2) 4.7ghz, C states enabled, dynamic vcore, LLC standard/lowest setting
4700_dynamicOC_C_enabled.jpg 375k .jpg file
Test 3) 4.7ghz, C states AUTO, dynamic vcore, LLC standard/lowest setting.
4700_dynamOC_C_AUT0_gb.jpg 372k .jpg file

SeanPoe did a thorough testing on his, found similar results, actually C states hurt his read speed more than on mine in some cases.
http://www.overclock.net/t/1262255/effect-of-power-saving-features-on-ssd-speed
And another with Gigabyte mobo that apparently contacted Gigabyte about it, complaining of C states affecting SSD
http://forums.anandtech.com/showthread.php?t=2192825
Quote:
Another with Gigabyte mobo posting about itAs it turns out, this can be fixed. All it takes is disabling C3/C6 states on the Intel CPU.After speaking with with Gigabyte personally,they told me this is Intel's fault and tough luck lol? Seriously? All your bios work till the last couple and now its Intel's fault that your new bios cut the write speeds in half? Arghhhh.
So..my question is,would anyone have any guess as to why disabling C3/C6 states is fixing the issue?
So..my question is,would anyone have any guess as to why disabling C3/C6 states is fixing the issue?
http://www.tomshardware.com/forum/298896-30-asus-p8z68-gigabyte-z68x-ud3h
Quote:
Someone on Xtreme posting about it 1 year ago, first post.Also as I mentioned on my gigabyte I disabled Cstates completely to get my solid state benching at correct speeds. I think (I'm pretty sure) I read (According to gigabyte) it was a problem with the sata spec and "not their fault"
http://www.xtremesystems.org/forums/showthread.php?273312-What-is-going-on-with-SSD-in-DMA-mode&s=8378edb311d0b02cba86b742aafc1237
speaking of his Crucial M4 SSD in both modes...
Quote:
And another complaining about it:both are seriously affected by any CPU power-saving C-states (especially C1E, but also C3/6/7)
http://gskill.us/forum/showthread.php?t=6724
Quote:
Another person found same issue with C states on his
I got some interesting result when I tested SSD.
When I set CPU configuration C-State option
Enable
min:157.2MB/S
max:181.5MB/S
Disable:
min:225.3MB/S
max:240.8MB/S
When I set CPU configuration C-State option
Enable
min:157.2MB/S
max:181.5MB/S
Disable:
min:225.3MB/S
max:240.8MB/S
Quote:
http://www.ocztechnologyforum.com/forum/showthread.php?93081-C1-C3-C6-State-Support-Disabled-in-BIOS-Ultra-SSD-PerformanceWhat are these state supports? Why does disabling them enhance SSD drive performance/CPU/Graphics performance?
Toms articles first wrote about it back in 2009 and several threads across different forums of people confirming same back then.
toms articles is here: http://www.tomshardware.com/reviews/ssd-hdd-power,2170-4.html
their conclusion:
Quote:
Had posted these once, but here is mine with a 40% decrease in 4K random write speed, and 10-25% decrease in random read speed. And yes with GB UD5H, ie in my sig.However, our findings are significant, as they can affect users who may not even know they are running an SSD with the brakes on. In short: really fast SSDs that can deliver 200 MB/s or even more of throughput become limited by CPU performance due to power saving mechanisms—or more precisely, they are bottlenecked by a limited availability of CPU time. This became obvious by switching the various power saving options on and off. We found that the sophisticated power saving mechanisms—such as the Active State Power Management for PCI Express, or the deeper C states that switch off entire functional units within the CPU at a transistor level—have a noticeable impact on the performance of our X25-E flash SSD. Obviously, the latency added by utilizing the more complex power saving features is significant enough to have to wait for the system to pick up data.
Test 1) 4.7ghz, C states OFF, Vcore fixed, LLC turbo.
4700_Coff_manualvcore.jpg 389k .jpg file
Test 2) 4.7ghz, C states enabled, dynamic vcore, LLC standard/lowest setting
4700_dynamicOC_C_enabled.jpg 375k .jpg file
Test 3) 4.7ghz, C states AUTO, dynamic vcore, LLC standard/lowest setting.
4700_dynamOC_C_AUT0_gb.jpg 372k .jpg file
























(85~90C)
