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About Vdroop with the EVGA X58 SLI E758

post #1 of 15
Thread Starter 
Before I start, yes I am well aware of the many guides and forums pertaining to my specific question, it has been asked before, but I am finding many of the explanations about it somewhat confusing, and people offering contradicting information about it. So hence my question here.

I was first brought to this issue when I began to OC my sig rig today and yesterday. I have my voltages set in the BIOS at their stock pretty much, except that I raised the VDIMM to 1.65 (yes, not 1.66 or 1.64). I'm currently seeing how far I can get on pretty much stock voltages.

My Vcore is set in my BIOS to 1.25625V, but CPU-Z shows the core voltage whilst currently running a prime blend test to be 1.305V - what gives?! What is with the difference? I did some Googling around, and it appears to have something to do with the Vdroop settings (as far as I can see, if you know it's something else, let me know). In the BIOS, the line looks like this:

EVGA VDroop Control [With VDroop] OR [Without VDroop]

I currently have my setting at [With VDroop]. Some people say that leaving VDroop on is fine, others say that it will do bad things for your CPU/OC. And vice versa.

Obligatory CPU-Z screenshot:



I've noticed that my temps are a tad higher in Coretemp to by about 3 degrees than what they were at complete stock (ie, all BIOS default settings).

Can someone explain this to me clearly, and if you can give me some recommendations about what you think I should put the settings at?

-Scott
Edited by ArchLinuxFTW - 10/23/11 at 11:10pm
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Gear mentioned in this thread:

post #2 of 15
You embedded the picture wrong- quote my post to see how to do it:



Anyway, there is almost always an offset from what you set in the bios to what you see in Windows. I hope you mean 3v as a typo, I'm assuming you meant 1.305v. Don't go by your bios vcore, go by CPU-Z as it is the next closest thing to accuracy besides a multimeter. With Vdroop causes CPU voltage to drop under load, requiring you to actually set the voltage higher than you need to. Without vdroop keeps the vcore constant, under idle and load conditions. In my opinion this is optimal for overclocking because let's say for example, you need 1.3v to be stable. Without vdroop you can just have it at 1.3v constant, with vdroop you would need to set it higher to around 1.35v or something so it reaches that voltage when the CPU is stressed. If you set it to 1.3v it would droop down below causing instability.

If you want to know how to set settings, this guide is excellent.
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post #3 of 15
Thread Starter 
Quote:
Originally Posted by Dopamin3 View Post
You embedded the picture wrong- quote my post to see how to do it:



Anyway, there is almost always an offset from what you set in the bios to what you see in Windows. I hope you mean 3v as a typo, I'm assuming you meant 1.305v. Don't go by your bios vcore, go by CPU-Z as it is the next closest thing to accuracy besides a multimeter. With Vdroop causes CPU voltage to drop under load, requiring you to actually set the voltage higher than you need to. Without vdroop keeps the vcore constant, under idle and load conditions. In my opinion this is optimal for overclocking because let's say for example, you need 1.3v to be stable. Without vdroop you can just have it at 1.3v constant, with vdroop you would need to set it higher to around 1.35v or something so it reaches that voltage when the CPU is stressed. If you set it to 1.3v it would droop down below causing instability.

If you want to know how to set settings, this guide is excellent.
Thanks very much - now it makes sense

Typo corrected and embedding fixed. And yes, I am going by that guide in combination with one on the EVGA forums.

I don't have a multimeter, so I guess I will go by what CPU-Z indicates, and disable VDroop.
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post #4 of 15
Thread Starter 
Okay, with vdroop put as "without vdroop" and bumping the BCLK to 160, and NOT TOUCHING ANY VOLTAGES FROM THE LAST TEST, whilst running prime blend, CPU-Z shows my core voltage to be 1.352 V(!). Isn't that like the intel recommended hard limit on Vcore? Why did it jump like that? And why is it so much higher than what the vcore is set in in the BIOS (1.25625V). Yes, you said they can and will be different, but THAT different? Should I turn down my vcore in the BIOS?

-Scott

Edit: I should also note that my Vcore with prime stopped is 1.329V as reported by CPU-Z. That's still a very high discrepancy between the BIOS and CPU-Z too.
Edited by ArchLinuxFTW - 10/20/11 at 8:43pm
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post #5 of 15
1.35v is max "safe" for CPU VTT voltage, but many run higher (~1.45v) for high RAM clocks (2000mhz+). Vcore I'm not sure if Intel ever delivered a "safe" value for OCing, but with acceptable temps IMHO you are fine for 24/7 1.45v.
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post #6 of 15
An easy way to think of it is this:
With VDroop means you are setting the max voltage your CPU will receive.
Without VDroop means you are setting the minimum voltage your CPU will receive.
I personally leave mine With VDroop and just bump my voltage up a little bit. For instance, I have my voltage set in my BIOS to 1.4v, but under load CPU-Z reads roughly 1.375v, but sitting at idle I have 1.399v going to my CPU according to CPU-Z. It just boils down to whether you want a lower idle voltage and a higher load voltage, or a higher idle voltage and a lower load voltage (when compared to what you have set in BIOS). It doesn't really matter which setting you use, just pick one and start from scratch following that guide.
Another handy resource to have on hand is this one: http://www.overclock.net/intel-gener...l#post11600817
That will help with figuring out which voltages to increase.
Hope this helped.
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post #7 of 15
Thread Starter 
Quote:
Originally Posted by Dopamin3 View Post
1.35v is max "safe" for CPU VTT voltage, but many run higher (~1.45v) for high RAM clocks (2000mhz+). Vcore I'm not sure if Intel ever delivered a "safe" value for OCing, but with acceptable temps IMHO you are fine for 24/7 1.45v.
Will 1.45V burn the proc up quicker? I'm not afraid of temps, a full loop like mine can handle it no problem. My worry is processor lifetime. I like my stuff to last me a long time (and going into university next year I'm not sure when my next upgrade will come anyways lol).

Rep to both of you for the quick help and good explanation!

Edit: Just noticed the core voltage is going up to 1.364V, likely due to temps going up the temperature/voltage curve. Edit #2 - yep, it's the increase in temperature - I watched some youtube videos, and the extra heat dumped into the system caused the voltage to stay at 1.364.
Edited by ArchLinuxFTW - 10/20/11 at 9:11pm
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post #8 of 15
As far as I know, CPU degradation from Vcore doesn't really happen unless you are pumping a lot of volts through your CPU for significant amounts of time. Like 1.5+ for a few months with bad cooling. I would consider 1.45v perfectly safe as long as your load temps are less than like 75c.
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post #9 of 15
Thread Starter 
Quote:
Originally Posted by CarFreak302 View Post
As far as I know, CPU degradation from Vcore doesn't really happen unless you are pumping a lot of volts through your CPU for significant amounts of time. Like 1.5+ for a few months with bad cooling. I would consider 1.45v perfectly safe as long as your load temps are less than like 75c.
Sweet. I am still curious as to why so much volts are going through there, and why it is increasing like it is due to temperature - it's like there's a setting playing around with it.

Edit: (I like editing posts instead of obnoxiously posting lots of single line posts) - Upped the bclck to 170, after 160 was prime blend stable for 1.5h. The voltage didn't increase or anything, and it's stable right off the bat. Didn't adjust any other settings than the bclck this time around again.
Edited by ArchLinuxFTW - 10/20/11 at 9:22pm
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post #10 of 15
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Alright, I've reached 3.95 GHz, still haven't changed anything from last time around. Except that I've noticed that now that speedfan is fired up, the VRMs are getting real hot under load whilst stress testing - they reach 74 C. They stay at about 57 at idle. Now, I know these things should be designed to take a lot of heat, and on the EVGA X58 SLI boards they aren't very well cooled, especially with liquid-cooled rigs that don't have any fans near the cpu area.

Should I use a small 80mm fan I have and set that to blow onto that area, or are those temps ok?

I'm starting to do longer stress tests as my overclock climbs. I don't want a VRM to go up in smoke like this guy overnight.
Edited by ArchLinuxFTW - 10/20/11 at 11:43pm
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Blackout
(26 items)
 
  
CPUMotherboardGraphicsGraphics
Intel Core i7 930 EVGA 132-BL-E758 EVGA GeForce GTX 295 Co-op Edition BFG GeForce GTX 275 
RAMHard DriveHard DriveHard Drive
Super Talent Chrome (Eplida Hypers) WD Caviar Black 1TB Caviar Blue Kingston SSDnow V-Series  
Optical DriveCoolingCoolingCooling
Sony Optiarc DVD w/ Lightscribe EK Supreme HF Full Gold CPU Waterblock Hardware Labs Black Ice GTX 360 Radiator  Gentle Typhonn AP-15 
CoolingCoolingCoolingCooling
Black Primochill 1/2" ID 3/4" OD tubing Swiftech MCP35X Pump/HS/Resevoir combo  Swiftech Epsilon Full Cover GTX 295 Block Swiftech Komodo Full Cover GTX 275 Block 
OSOSMonitorMonitor
Arch Linux 64-bit Windows 7 64-bit Professional Dell U2311 A01 Dell 1905FP 
KeyboardPowerCaseMouse
IBM Model M Corsair TX850 V2 ABS Canyon 595 Logitech G500 
Mouse PadAudio
Razer Destructor Dell 2.1 Speakers  
  hide details  
Reply
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Overclock.net › Forums › Intel › Intel Motherboards › About Vdroop with the EVGA X58 SLI E758