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CPU VCCIO Voltage & System Agent Voltage - Stabilty of XMP??? - Page 3

post #21 of 30


Its under dram timings the first heading at the top, I have it highlighted in the pic.

Quote:
Originally Posted by Advil000 View Post

Strife,

I'm trying to figure out if the Ranger has the same "Mode 1" option as your Hero. Can you describe again exactly, from the BIOS main menu what you click on in what order to see that option? I'm pretty sure it's not there for us Ranger owners, but I'd like to be absolutely certain.

From various forums I've been reading ASUS kind of acts like all the ROG VIII series boards have this option, but I can't find it in my Maximus VIII Ranger BIOS (0801 beta) anywhere.

Thanks!
    
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post #22 of 30
Thank you!!! That's what I was looking for.

Alright then this is odd/unfortunate. The Maximus Ranger VIII, in spite of being a Maximus board, does NOT have that option.

Which might help explain why Ranger users are having a heck of a time getting some timings that work at 3000+.
post #23 of 30
why is my cpu systemagent voltage red on aisuite 3?

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post #24 of 30
Quote:
Originally Posted by patriotaki View Post

why is my cpu systemagent voltage red on aisuite 3?


Did you change any settings in Bios?
post #25 of 30
I just found this thread after a lot of Google searching.

I have a 2400MHz DDR3 CAS 10 G.Skill RAM double 8GB Modules with a 4790K Overclocked with a mild 4.4GHz (Down from 4.7GHz because I can't seem to make it 24 hours prime95 stable, always fails around the 14 hour mark) and I just can't get it 100% stable, I've come to the conclusion that the RAM is to blame.

I noticed my System Agent voltage was low at 0.85v with Digital and analog I/O voltage on 1.0v, all these settings were surprisingly good even though it was the literal minimum possible value for these settings and I'm running XMP for my G.Skill Trident X with Tweak Mode set to 2 in DRAM timings on my ASUS Maximus Impact VII, it allowed me 10 passes on Memtest86+ and 14 hours of prime95.

Since I have no patience I just raised the System Agent voltage to 1.15, A-I/O voltage to 1.10v and D-I/O to 1.1625v all at once because I don't want to micro manage these settings that seem to have no significant effect on temperatures anyway.

My question is, is there any disadvantage to doing this? I'm in the middle of a 8 to 4096K custom test on prime95 that I will leave on for 21 hours, how do you guys have these settings? Any insight will be greatly ppreciates!
Edited by Dargonplay - 7/8/16 at 8:03pm
post #26 of 30
Quote:
Originally Posted by Dargonplay View Post

I just found this thread after a lot of Google searching.

I have a 2400MHz DDR3 CAS 10 G.Skill RAM double 8GB Modules with a 4790K Overclocked with a mild 4.4GHz (Down from 4.7GHz because I can't seem to make it 24 hours prime95 stable, always fails around the 14 hour mark) and I just can't get it 100% stable, I've come to the conclution that the RAM is to blame.

I noticed my System Agent voltage was low at 0.85v with Digital and analog I/O voltage on 1.0v, all these settings were surprisingly good even though it was the literal minimum possible value for these settings and I'm running XMP for my G.Skill Trident X with Tweak Mode set to 2 in DRAM timings on my ASUS Maximus Impact VII, it allowed me 10 passes on Memtest86+ and 14 hours of prime95.

Since I have no patience I just raised the System Agent voltage to 1.15, A-I/O voltage to 1.10v and D-I/O to 1.625v all at once because I don't want to micro manage these settings that seem to have no significant effect on temperatures anyway.

My question is, is there any disadvantage to doing this? I'm in the middle of a 8 to 4096K custom test on prime95 that I will leave on for 21 hours, how do you guys have these settings? Any insight will be greatly ppreciates!

I have Vccio original 0.960v changed to 1.165v and Vccsa (System Agent) original 1.060v changed to 1.275v that will help with memory stability, that is the only thing you should change besides running XMP.

When you run prime95 do you use the option of round off checking? it will save you time so you can try changes quicker.

What is your vcore?

On thing to test the stability of the memory is run the memory in XMP have the CPU run stock then run prime95. To test the stability of the CPU run the memory stock overclock the CPU.
post #27 of 30
Quote:
Originally Posted by wingman99 View Post

I have Vccio original 0.960v changed to 1.165v and Vccsa (System Agent) original 1.060v changed to 1.275v that will help with memory stability, that is the only thing you should change besides running XMP.

When you run prime95 do you use the option of round off checking? it will save you time so you can try changes quicker.

What is your vcore?

On thing to test the stability of the memory is run the memory in XMP have the CPU run stock then run prime95. To test the stability of the CPU run the memory stock overclock the CPU.

Since I had System Agent originally at 0.85v and I could still manage 14 hours of Prime95 I kind of made an educated guess of how 1.15v from 0.85v would actually be WAY more than enough, I in fact just lowered it just now to 1.25v and restarted Prime95 for the entire 8K to 4096K 100% stability 21 hour test.

I also read that CPU Digital I/O Voltage is just as critical if not more than System Agent in regards to RAM stability at high speeds and/or tighter timings, so I also increased the voltage from the original value of 1.0v to 1.16v

I have my 4790K currently at 4.4GHz with Cache still on stock 4.0GHz for testing purposes with 1.17v on the cores and 1.9v Input Voltage, it's looking good so far, I will know for sure by tomorrow if the System Agent, Analog and Digital I/O Voltage changes made this overclock 100% stable because I could use 1.25v on this 4.4GHz overclock and it would still fail around the 8-14 hour mark because of my G.Skill 2400MHz C10 RAM (I think), once I can make sure it is stable with these new SA and I/O Voltage values I will move on to increase my Overclock from 4.4GHz to 4.8GHz maybe? Followed by Cache later on knowing that the RAM is no longer the bottleneck.

And no, I don't use round off checking, I didn't even knew that setting existed doh.gif
Edited by Dargonplay - 7/8/16 at 8:26pm
post #28 of 30
Quote:
Originally Posted by Dargonplay View Post

Since I had System Agent originally at 0.85v and I could still manage 14 hours of Prime95 I kind of made an educated guess of how 1.15v from 0.85v would actually be WAY more than enough, I in fact just lowered it just now to 1.25v and restarted Prime95 for the entire 8K to 4096K 100% stability 21 hour test.

I also read that CPU Digital I/O Voltage is just as critical if not more than System Agent in regards to RAM stability at high speeds and/or tighter timings, so I also increased the voltage from the original value of 1.0v to 1.16v

I have my 4790K currently at 4.4GHz with Cache still on stock 4.0GHz for testing purposes with 1.17v on the cores and 1.9v Input Voltage, it's looking good so far, I will know for sure by tomorrow if the System Agent, Analog and Digital I/O Voltage changes made this overclock 100% stable because I could use 1.25v on this 4.4GHz overclock and it would still fail around the 8-14 hour mark because of my G.Skill 2400MHz C10 RAM (I think), once I can make sure it is stable with these new SA and I/O Voltage values I will move on to increase my Overclock from 4.4GHz to 4.8GHz maybe? Followed by Cache later on knowing that the RAM is no longer the bottleneck.

And no, I don't use round off checking, I didn't even knew that setting existed doh.gif
You can save your self a lot of time just enable round off checking check back in a hour while running prime95 and look at all the worker threads, page up look for round off error.

For my skylake prime95 for 15 hour pass I needed vcore 1.332v for 4.5GHz. Yes Vccio is the most important to overclock memory, it supplies the voltage to the memory controller in the CPU.

Does prime 95 end it's test in 21 hours I never have run it that long? Do you set custom settings for prime95, I just use prime blend?
post #29 of 30
Quote:
Originally Posted by wingman99 View Post

You can save your self a lot of time just enable round off checking check back in a hour while running prime95 and look at all the worker threads, page up look for round off error.

For my skylake prime95 for 15 hour pass I needed vcore 1.332v for 4.5GHz. Yes Vccio is the most important to overclock memory, it supplies the voltage to the memory controller in the CPU.

Does prime 95 end it's test in 21 hours I never have run it that long? Do you set custom settings for prime95, I just use prime blend?

Never heard of Round off checking before, what does it do exactly?

1.33v sounds quite a lot for Skylake which I thought needed even less voltage compared to Devil's Canyon! And btw what is VCCIO? The CPU Digital or Analog I/O Voltage? I'm not familiar with the nomenclature.

And no, technically Prime95 doesn't end but I'm using Custom Settings where I force Prime95 to run every single instruction from 8K to 4096K which runs the instructions in the following order:

448k, 8k, 512k, 12k, 576k, 18k, 672k, 21k, 768k, 25k, 864k, 32k, 960k, 36k, 1120k, 48k, 1200k, 60k, 1344k, 72k, 1536k, 84k, 1728k, 100k, 1920k, 120k, 2240k, 140k, 2400k, 160k, 2688k, 192k, 2880k, 224k, 3200k, 256k, 3456k, 288k, 3840k, 336k, 400k, 480k, 10k, 560k, 16k, 640k, 20k, 720k, 24k, 800k, 28k, 896k, 35k, 1024k, 40k, 1152k, 50k, 1280k, 64k, 1440k, 80k, 1600k, 96k, 1792k, 112k, 2048k, 128k, 2304k, 144k, 2560k, 168k, 2800k, 200k, 3072k, 240k, 3360k, 280k, 3584k, 320k, 4000k, 384k, 4096k

Then in "Time to run each FFT Size" I select 20 minutes so Prime95 runs every FFT size thoroughly, in the end it takes around 24 hours for Prime95 to run every single FFT instruction for 20 minutes with "Run FFTs in place" checked, it is the best way I know to test for CPU stability.
post #30 of 30
Quote:
Originally Posted by Dargonplay View Post

Never heard of Round off checking before, what does it do exactly?

1.33v sounds quite a lot for Skylake which I thought needed even less voltage compared to Devil's Canyon! And btw what is VCCIO? The CPU Digital or Analog I/O Voltage? I'm not familiar with the nomenclature.

And no, technically Prime95 doesn't end but I'm using Custom Settings where I force Prime95 to run every single instruction from 8K to 4096K which runs the instructions in the following order:

448k, 8k, 512k, 12k, 576k, 18k, 672k, 21k, 768k, 25k, 864k, 32k, 960k, 36k, 1120k, 48k, 1200k, 60k, 1344k, 72k, 1536k, 84k, 1728k, 100k, 1920k, 120k, 2240k, 140k, 2400k, 160k, 2688k, 192k, 2880k, 224k, 3200k, 256k, 3456k, 288k, 3840k, 336k, 400k, 480k, 10k, 560k, 16k, 640k, 20k, 720k, 24k, 800k, 28k, 896k, 35k, 1024k, 40k, 1152k, 50k, 1280k, 64k, 1440k, 80k, 1600k, 96k, 1792k, 112k, 2048k, 128k, 2304k, 144k, 2560k, 168k, 2800k, 200k, 3072k, 240k, 3360k, 280k, 3584k, 320k, 4000k, 384k, 4096k

Then in "Time to run each FFT Size" I select 20 minutes so Prime95 runs every FFT size thoroughly, in the end it takes around 24 hours for Prime95 to run every single FFT instruction for 20 minutes with "Run FFTs in place" checked, it is the best way I know to test for CPU stability.

Round off checking is for checking the floating-point unit (FPU, colloquially a math coprocessor) is a part of a computer system specially designed to carry out operations on floating point numbers. Typical operations are addition, subtraction, multiplication, division, square root, and bitshifting.
https://en.wikipedia.org/wiki/Floating-point_unit

My skylake failed Round off checking 4.5GHz at 1.31v, it does not sit at 1.33v I have spread spectrum enabled.

Data sheet for 4790K go to page 117 http://www.intel.com/content/www/us/en/processors/core/desktop-6th-gen-core-family-datasheet-vol-1.html

What does FFT mean and when you say each size how does that relate to transistors in the CPU?
Edited by wingman99 - 7/8/16 at 10:42pm
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