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Haswell Overclocking Guide [With Statistics] - Page 247

post #2461 of 19539
Thread Starter 
Quote:
Originally Posted by t0tum View Post


In AVX2 you will. I pull on average 4Watt more from the wall when i comapred 42 uncore against 44, i also got on average 0.6 less gflops when running 42 uncore.

Furthermore, by playing with kill a watt, which is suprisingly close to HWinfo values on a bare cpu system with 1ssd, i found a limit of my chip to be stable at, which is little over 150w. To test this theory i bumped my 4.5 overclock to 1:1 with higher mem just to exceed 150w and bsod in linpack in 20min. This explains why i can do superpi & cinebench @ 4.7 all day long as the wattage doesn't come close to my 4.5 @ full AVX2 draw.
Anyhow, I stopped beating this dead horse. Clearly, i cant keep 4.6 under 150w to be AVX2 stable and yet i cant give more volts due to power limit of my chip.
AVX2 stability was my goal, so dont judge me:D

 

I think I can find a performance difference between 3.9 vs 4.4 uncore with chess, which is non-avx2. Differences won't be night and day of course.

 

Wunderbar, got 101 error this time. So I've basically had each bsod, 101, 125, 9c, lol. Pretty sure not all three are lacking.

 

I've switched to a new chess engine for my chess workload and it might be bsoding me faster than normal. I'll have to run another day or two to rule out pure luck.


Edited by Darkwizzie - 9/12/13 at 4:34pm
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post #2462 of 19539
Aren't all in the statistics list supposed to be stable?
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post #2463 of 19539
Quote:
a lot of early test showed the better the chip the lower the input voltage needed thus less heat.

I was under the impression that lower vcore = lower VRIN works better as a trend, and that going too high or too low was worse for stability - and also that being so close to vcore, like 1.425vcore and 1.65vrin, was bad because vcore starts to droop quite hard if you don't have high enough input voltage to keep it stable, which is why intel and some other sources reccomended staying at least +0.4v over vcore

As for my testing, i can only say that i've seen solidly my 4.6 overclock at 1.25vcore works better with 1.76vrin (extreme llc) than with 1.72 or 1.8. I tuned down to the point where i could make both of the edge values fail but not the middle one, and can also say that my chip seems to work much better if i pull VRIN around, like much less VRIN for low vcore, more for high vcore

Have you got much data for this on a tightly tuned overclock or are you still testing?
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post #2464 of 19539
Thread Starter 
Quote:
Originally Posted by fateswarm View Post

Aren't all in the statistics list supposed to be stable?

 

All statistics in the list are stable for the stress it was listed under.

Having said that I'm thinking of revising my own entry.

 

 

 

I can now confirm, the Stockfish 4 engine for chess is much more stressful than Houdini 3, it's a harder stress test.

 

New version of Hwinfo is now out.

 

I also god a 7E bsod, because of the craptastic Killer NIC drivers with my mobo. Not overclock related. NIC issues have been reported with this mobo before.

http://answers.microsoft.com/en-us/windows/forum/windows_7-system/bluescreen-ndissys-windows-7/05785887-52c1-4a98-b280-24b6413d323e

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post #2465 of 19539
I'd be interested in using that, any quick guide for how to stress test with it?
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post #2466 of 19539
Thread Starter 

http://www.youtube.com/watch?v=tZJLrBAiCN0

I've bad two bsods after 10 minutes, another bsod after 1-2 hours. Typically on Houdini 3 I bsod after like 6-24 hours.

That, or I was just very unlucky today, lol.

 

Oh, and Stockfish 4 is a free engine too. So that's good too.

Looks like I have to run my actually stable setting (4.5ghz) to do chess now lol.

 

I think you'll be pretty hard pressed to find a real-world application that is more hot or more stressful than Stockfish, even compared to encoding with CPU only. Stockfish 4 I think is more stressful than Houdini but just as hot I think.

 

I will do more testing on 4.6ghz for Stockfish. I'm still new to this engine.


Edited by Darkwizzie - 9/12/13 at 5:18pm
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post #2467 of 19539
Quote:
Originally Posted by Clexzor View Post

yes...running 4.9ghz stable right now at 1.425v uncore 39x 1.15v vrin 1.75v thumb.gifthumb.gif
What are you using to stress test and how long do you run it?

I cannot believe you are managing such a low VCCIN. For some reason, if I don't have it as high as 1.9V for just 1.24V/1.175V, I get 0x124 with OCCT. Prime would give one until I raise it to 1.26V!!! Perhaps if I lowered VCCIN, I will have to increase the Vcore.

I wonder if you have to have such a high Vcore because the VCCIN is too low? If I were you, I would increase the VCCIN to see if it allows me to drop the VCore.
post #2468 of 19539
If you don't apply VRIN LLC it will droop really hard when you pull lots of power, so your 1.9 could actually be even 1.75 or less and be unstable under avx prime. I have no data from multimeters and only a bit from software, though
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post #2469 of 19539
Quote:
Originally Posted by ChrisB17 View Post

So reading through this thread. Has anyone got a fully stable overclock yet? headscratch.gif

I have two, 4.6 GHz (4.3 Uncore) @ 1.232V, which is my 24/7 overclock. I also have 4.7 GHz (4.3 Uncore) @1.296V, but it is more for benchmarking. Since switching both to adaptive I have not had a single BSOD or restart, so I consider that pretty stable. In order to test stability I use IBT 20 passes of maximum, and Linpack manual input for initial stressing. If it passes those I switch to OCCT or Prime (depending on my mood) and do a 7-10 hour run, checking it periodically. After that I switch to adaptive and do a 3D Mark 11 loop of only physx and combination tests for about 2 hours, some video conversion, and then a bunch of gaming.

There are plenty of others who also have stable clocks, but they don't post here much anymore and are probably busy gaming. Since I have a two year old running around at home my time for gaming has taken a serious hit. Although I am set with my two profiles, I still have some unanswered questions about the VID and Vcore offset influenced by the new FIVR. I think there is a lot of misconception floating around about Haswell, and many people are only focusing their attention (or arguments in some cases) on a small percent of samples.
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post #2470 of 19539
BTW im saying screw it and running all out in the name of Performance lol 5.0ghz 1.51v \\ 4.5ghz uncore 1.25v VRIN 2.0v Life expactency 6months to a year till degrade occurs and voltage is need for stability....ill let you guys know in couple motnhs if everything is still cranking and all is good lol thumb.gif

wont see me much anymore in thread have a new job and need to focus plus I need to find a girlfriend lol been almost 2 years lol lay off the hookers guys no good ha
GamingRig
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GamingRig
(16 items)
 
H-Server
(12 items)
 
 
CPURAMHard DriveOptical Drive
Intel i7-4770 8gb 2400 Gskill Samsung 840 Pro 120Gb Samsung 840 120gb 
Optical DriveOSMonitorKeyboard
2TB Seagate External Win 8 64-Bit Qnix 2560x1440 120hz Corsair Mech k90 
PowerCaseMouseMouse Pad
Corsair AX860 Plat. Lian Li MATX Razer Deathadder 2013 Razer Ironclad 
CPUMotherboardGraphicsRAM
i5-2550k (Stock) MSI Z77 G55 ATI 5xxx 1Gb Corsair 8gb  
Hard DriveHard DriveHard DriveCooling
Seagate 500Gb Seagate 2Tb Seagate 2Tb Stock 
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Windows Home Server 2011 LG 1920x1080 600w Corsair Green Asus 
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