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post #8341 of 9343
I performed an unsophisticated test of the affect of C-states on SSD performance within time constraints I have, My goal was to 1. Demonstrate that this isn't just and AS-SSD effect and 2. Crudely show its dependence on load. The effect isn't big in these test and that is not surprising as they are mixed read/write. FWIW biggrin.gif

I really didn't do C-states off because I didn't want to keep going back and forth to the BIOS to change settings. Instead I ran P95 blend in one thread - that effectively removes idle states and is equivalent to turning them off. The P95 run is the base and labeled P95 (Base).

I ran Anvil with a 4k read./write mix with 2 threads (I also did a 6 thread run). I took 5 runs each and calculated the mean and standard deviation. Here are the loads I ran concurrent with Anvil:

P95 (base)
no P95
no P95 with Amazon prime video playing
no P95 with IE fish running in Chrome and Firefox. I have included a screenshot of what that load looks like)



I give the average MB/s and the sigma and what percent less the result is than with P95 load

P95 base (no C idle states, i.e. C0)
51.6 0.17
Idle load
47.0 1.09 (9.8% less)
Streaming Movie load
46.68 0 .65 (10.2 % less)
IE fish load
48.9 0.43 (5% less)

QD=6, P95 load
74.98 0.36
QD=6, idle load
78.52 0.19 (5.2% less)

Conclusion is that there is an effect even at moderately light loads. A movie playing had the same results as idle, but running something more compute intensive lessened the effect. The idle load shows a lot more variation than the P95 load (sigma of 1.09 vs 0.17), which is to be expected from the random-like occurrences of the idle-states kicking in.

Nothing to get your knickers in a knot I guess. If I ever get time I will try and find something more real-world.
post #8342 of 9343
Thank you all who have been discussing the c states these past couple of days. have helped alot.


I have another question.....


How can you accurately tell what your vrm temp is on a p8p67 pro rev 3.1 motherboard?

Is the "motherboard" temp in ai suite the vrm temp or some random point on the motherboard?


I am trying to get the airflow right in my case and want to see if it makes a difference in vrm temps. thumb.gif
   
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post #8343 of 9343
I believe the Motherboard temperature is measured on one of the MB controller chips, like the Nuvoton. It could be off chip - the CPU temperature measured by the Nuvoton must be off chip. So I guess random may be accurate.

I don't think there is any measure of the VRM temp on these boards - I wish.
post #8344 of 9343
So im going to have to get all touchy feely with my heatsinks then. lol biggrin.gif


If I had one of those infrared thermometers it would probaly help. Might be a little to expensive just to try and get my airflow right though. redface.gif
   
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post #8345 of 9343
I've had the lights for a while and I don't think I have any system restore points. I tried other USB ports ans they're all the same. It's just the LED strip that has a problem.
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post #8346 of 9343
hi, i have a P8Z68-V pro/gen3. wanted to ask if it also shows the post screen 2 times for you? it's a little annoying, because the pc would boot up faster, if it would be shown only once smile.gif thanks
post #8347 of 9343
you have to go into the bios and select "keep current" I believe in one of the post options on the second to last tab.
   
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post #8348 of 9343
Quote:
Originally Posted by BLAMM0 View Post

hi, i have a P8Z68-V pro/gen3. wanted to ask if it also shows the post screen 2 times for you? it's a little annoying, because the pc would boot up faster, if it would be shown only once smile.gif thanks
Quote:
Originally Posted by Mason@ASUS;4712067
Some of you may have been experiencing a double POST on your P8P67 series motherboard whereupon after powering on the system from a cold boot, the board will power on and then immediately reset itself before it actually POSTs and shows any display on the screen. I’ll explain the fix below and give some information about why this happens.

First, I would like to stress the importance of flashing the BIOS to the latest BIOS revision as listed on our support website, http://support.asus.com/download. You can access the ASUS EZ Flash tool from within the UEFI (advanced options, tools) to flash the BIOS from any removable device such as a USB flash drive.
From time to time we needed to implement full resets in order to maintain stability due to the architecture of the Sandy Bridge platform. For instance, the system may require one full reset when the PCH power has been cut during S5 power state. To fix the most common additional reset (double POST when powering on from off state), enter UEFI BIOS -> go to ‘Advanced’ tab -> go down to ‘APM’, press Enter -> enable the “Power on by PCIe.” function. Then press F10 to save & exit. After save & exit, let the system boot into Windows or other OS, then perform a proper shutdown: Start button -> Shut down. You will no longer have the double POST. We will fix this in an upcoming BIOS release.

Also there's a false double post because of the Marvell (Which controls the two Navy Blue SATA connectors topmost on the board) controller which detects no harddrive and loops you back to the main screen, and then back to the Marvell screen yet again? If you don't use it you can disable it in bios. Same goes for the JMicron controller which handles the E-Sata at the back of the board. Under "Advanced" tab in UEFI.
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post #8349 of 9343
Quote:
Originally Posted by BLAMM0 View Post

hi, i have a P8Z68-V pro/gen3. wanted to ask if it also shows the post screen 2 times for you? it's a little annoying, because the pc would boot up faster, if it would be shown only once smile.gif thanks

 

Here's how to fix this (it's actually nothing to "fix", really)

 

  1. Go into the advanced part of the UEFI as opposed to the EZ Mode.
  2. Switch to the Advanced tab.
  3. Select "Onboard Devices Configuration"
  4. Disable "Marvell Storage Controller"
  5. Disable "JMB Storage Controller"
  6. Press F10 to save and exit.

 

Note:  disabling the Marvell Storage Controller turns off the dark blue SATA ports.  Disabling the JMB Storage Controller turns off the eSATA functionality.  So, be careful.

 

I also recommend disabling the logo screen:

 

  1. In the UEFI again, switch to the Boot tab
  2. Disable "Full Screen Logo"
  3. Press F10

 

Note:  You'll need to practice holding down the Delete key in order to get back into the BIOS because the POST will be faster and it won't be as obvious regarding when to begin pressing Del.  So, experiment and you'll find a spot where you really only need to hold it down for maybe 3-4 seconds.


Edited by TwoCables - 2/8/13 at 6:13am
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post #8350 of 9343
Well I'm running out of options. I just flashed to the latest BIOS and nothing's changed. The only thing I haven't tried is clearing the CMOS.

Edit: Not sure what I did but it's solved
Edited by geoxile - 2/8/13 at 11:34am
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