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Vdroop or not??(LLC) Poll!! - Page 6

Poll Results: Would you have Vdroop on or off?

 
  • 53% (114)
    Vdroop on
  • 46% (98)
    Vdroop off
212 Total Votes  
post #51 of 84
Thread Starter 
Quote:
Originally Posted by freecableguy View Post
Hi all - without getting too much into the weeds, let me see if I can bump this conversation in a new direction.

If you're going to concern yourself with a voltage, let it be the load voltage and not the idle voltage. This is especially true when working with any Intel CPU that makes use of the new PCU (power control unit) functionality, designed to minimize overall power consumption through the use of advanced power-gate technology.

When a chip is at idle, total CPU power is already so low....we're talking 8-10W, even with a very agressive overlock applied. Making a fuss about 0.1V at this point may be the difference in power consumption of 0.5 to 1W max.

Instead, why not focus on the load voltage, where your efforts can gain you real benefit? To do this you need to first remove any concern in minimizing idle voltage - just put it right out of your mind.

Now, if you find that with LLC enabled you end up with a lower, as measured, full load voltage than you would otherwise, I would be very surprised. What typically happens is during the course of optimization you will find the actual full load voltage required for complete stability is slightly higher with LLC enabled, than with it off per Intel specification.

Although this is not the only reason for working within Intel spec when it comes to Vdrop/Vdroop, it's a nice added bonus to say the least.
interesting point
+rep
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post #52 of 84
Quote:
Originally Posted by freecableguy View Post
If you're going to concern yourself with a voltage, let it be the load voltage and not the idle voltage. .
Yes. Was actually just about to make a post to this effect. +rep
Finally an update
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post #53 of 84
I voted for Vdroop off because I was thinking that you meant Vdroop = LLC. I keep LLC disabled, so it should actually be one less for Vdroop off and one more for Vdroop on.

Does this make any sense?
post #54 of 84
Quote:
Originally Posted by Pillz Here View Post
I voted for Vdroop off because I was thinking that you meant Vdroop = LLC. I keep LLC disabled, so it should actually be one less for Vdroop off and one more for Vdroop on.

Does this make any sense?
Not at all.
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post #55 of 84
I currently run my Q9550 w/ LLC on. Bios voltage is set at 1.34 V, but CPU-z reads it as 1.28 V.

I guess I'm still just confused after reading through the 6 pages of this thread. I was hoping to get a clear answer.

I run LLC on b/c it's a PITA to get a stable OC on this board otherwise. When I was using my E8400 I had it at 1.36 V for 4.0Ghz and it was unstable. Turn LLC on and it was the same voltage but stable. Same thing goes for my current Q9550.

I understand LLC spikes the voltage but without it on my voltage would drop (vdroop) significantly (or at least I thought it was significant). So I'm only at 1.34 V w/ LLC on, so I think that is safe.
    
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post #56 of 84
Quote:
Originally Posted by Meta-Prometheus View Post
I currently run my Q9550 w/ LLC on. Bios voltage is set at 1.34 V, but CPU-z reads it as 1.28 V.

I guess I'm still just confused after reading through the 6 pages of this thread. I was hoping to get a clear answer.

I run LLC on b/c it's a PITA to get a stable OC on this board otherwise. When I was using my E8400 I had it at 1.36 V for 4.0Ghz and it was unstable. Turn LLC on and it was the same voltage but stable. Same thing goes for my current Q9550.

I understand LLC spikes the voltage but without it on my voltage would drop (vdroop) significantly (or at least I thought it was significant). So I'm only at 1.34 V w/ LLC on, so I think that is safe.

LLC is really you just fooling yourself into thinking you're running less voltage. Think of it like this...

With LLC disabled, you set BIOS voltage to what you feel to be safe, 1.36v. You then fire up Prime, voltage drops to, say, 1.32v... and you fail Prime.

You then enable LLC, BIOS voltage is still set to 1.36v. You fire up, Prime and voltage doesn't drop (it stays at 1.36v, on some boards maybe it even goes up to 1.40v)... and you pass Prime.


You incorrectly conclude that LLC stabilized your overclock. But what's really happening here? The reality of the matter is that your overclock needs 1.36v under load to be stable. LLC gives you 1.36v under load with a BIOS set voltage of 1.36v. If you wanted 1.36v under load with LLC disabled, you'd need to up BIOS voltage to maybe 1.39v. So it takes more voltage to stabilize your overclock that way, right? Wrong.

With LLC disabled, the voltage you set in the BIOS is the ABSOLUTE MAXIMUM your CPU will see on that high-load to low-load spike. It is NOT the running voltage of your CPU.

With LLC enabled, the voltage you set in the BIOS is NOT the absolute maximum your CPU will see on that spike - it is the voltage your CPU will see under load. This means that when your CPU encounters the high to low load voltage spike, it's going to overshoot your BIOS set voltage by quite a bit (as can be seen in the graph from Anandtech). This means your CPU ends up seeing HIGHER voltage than it does with LLC disabled... you just don't know about it.

LLC boils down to, out of sight, out of mind. Disabling it and raising your BIOS voltage until you are stable is simply letting you see just how much voltage your CPU is really seeing with LLC on.

Hope that made sense... I suck at explaining stuff...
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post #57 of 84
i vote vdroop off.
    
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post #58 of 84
I would say on if your using a 24/7 stability setting, but off if you are going for a max overclock such as for 3D Mark Vantage. I was able to pump another 75-100mhz with it off when Vantage CPU testing.
    
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post #59 of 84
Thread Starter 
results from poll seem to show that the community is split 50/50.
which i can agree with sorta.. since i seems to see mixed feelings on it
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post #60 of 84
LLC on here. Keeps CPU-Z measuring 1.232v under both idle and load, that's pretty much all my reasoning for using it. Voltage sweeps around w/o it.
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