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About Vdroop with the EVGA X58 SLI E758 - Page 2

post #11 of 15
If you have a fan handy, go for it. It won't hurt. I'll run a stress test and see what temp mine get to.
EDIT: The max temp I see on my VRMs is 64c. I also have a lot of fans in that general area of my mobo, so that is helping a lot.
Edited by CarFreak302 - 10/21/11 at 9:18am
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post #12 of 15
Thread Starter 
Hmm that's odd I just thought to load my stock profile, change the EVGA vdroop control to [without Vdroop], and see what happens. CPU-Z reads 1.282V - much closer to what I have set in the BIOS. The voltages are turned off [auto] in the BIOS, but still set to what they are at stock. Also of note is the fact that at stock my VRMs still go to 62 degrees C under P95.

So my question still remains, why is my voltage going up when I up the frequency, even though I am only changing the BCLK in the BIOS and nothing else really? I don't like the thought of not being able to control my voltages like that, it feels too imprecise, or that it's adding too much volts for some reason.

I have taken her to 4.121 GHz, at that rate the voltage goes up to 1.364V, even though it is set to the same thing as stock in the BIOS, and the vdroop control to [without vdroop].

Edit: So now I have seen that setting my Vcore at less 1.25625V (with vdroop set at [without vdroop]) will give a voltage of around 1.28-1.3 in CPU-Z under load (and a subsequent BSOD a few seconds later telling me to up the vcore). But as soon as I put the Vcore up to 1.25625, CPU-Z will report the voltage under load as before, 1.352, and the system is stable (for 4hrs prime blend, that is, haven't done a full stability test)
Edited by ArchLinuxFTW - 10/21/11 at 10:24pm
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post #13 of 15
You're over-analyzing this too much. Don't worry about it. Set the voltage based on what you need to be stable, and if that changes slightly based on BCLK/multiplier used then so be it. I used many X58 boards (Rampage III Extreme, Bloodrage, UT X58-T3eH8, Classified, E758) and the E758 was by far the most quirky, although I guess the other boards would be considered "premium" and sort of out of the league of the E758.
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post #14 of 15
Thread Starter 
It's quirky alright - even with my my current attempt to get my volts down, [without Vdroop] seems to just want to pump the volts in, and even with a fan blowing on my VRMs, they are at 83 C after a whole night of prime blend. And CPU-Z reports 1.376 volts vcore, and when the test started CPU-Z reported 1.352. From what I understand, the [without Vdroop] option is like enabling LLC.

When I put vdroop on, my voltage drops a whole ton (like 1.37 ish vcore in the BIOS, and CPU-Z saying 1.29) with my VRMs still in the high 70's - sounds to me like there is a ton of voltage leakage, due to the temps in the VRMs.

With my current settings, LLC is enabled (ie. Vdroop control off), Vcore set in the BIOS to 1.34375 V, CPU-Z reading it as 1.376 under load and 1.42 idle, my VRMs shoot up to 83 like I mentioned earlier. My CPU is at 4.1 GHz and Bus speed it 186. This passed 50 runs of IBT, about an hour of memtest, and prime is running on it right now.

I'll set my voltage to what is needed for my overclock, but it feels like I am having to add so much just to get to 4, and my VRM's are getting awful hot to boot. I am just afraid of making my chip unstable in the future due to the high volts.
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post #15 of 15
EVGA VDroop Control = Load Line Calibration (LLC)

When set to "Without Vdroop" will keep the voltages from dropping from idle to load, "With Vdroop" will allow it to fluctuate based on the setup.

The things I have noticed with the evga X58 line is that each setup will react differently.

Mine will actually load at a higher voltage with "Without" enabled, so I set 1.39v in bios and I actually have a cpuz load voltage of 1.41v and idle around 1.3875, its all perfectly stable

Also something I noticed with my old PSU (750W Ultra) is that once I went beyond 1.41v bios, my cpuz voltage began to be lower than bios. THis I thought was a wierd glitch from the board, however when I upgraded to my current Antec 750W that issue went away. So what was actually happening is once I went beyond 1.40v in bios, the PSU was struggling to provide the voltage to the cpu.


I have found no issue with LLC or VDroop Control being enabled. My system specs are 100% accurate for 24/7 use, and have been for a while now with no issues.
Prior to this I ran a Q9550 & EP45 with LLC enabled for well over a year with no issues.

The i7-900 series cpu is rated at 1.50v absolute maximum from the intel data sheets, so any core voltage below that should be perfectly safe.

Degredation takes a while to develop unless your pumping extreme voltage to it, up past 1.50v for bench runs. But even that takes time if its just a quick run.

I have pushed my voltage all the way to 1.60v to try and see how high I could post. Nothing blew up, and the system is still running fine...
Edited by 10acjed - 10/24/11 at 6:31am
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