Haswell Overclocking Guides / Results

[ehume]

Re: Haswell Overclocking Guides / Results

With Haswell, Intel built in over volting when AVX instruction set is being used. So you can dial in offset voltage using a stress test that does not use AVX. Once you use AVX the cpu will over volt over what you set with offset and do what it wants to do.

The only way around this is to enable all power states so vcore and cpu speed drop a idle and use fixed vcore. This way cpu will not over volt while using AVX instruction set.

Thank you thank you thank you. This explains what I have been seeing. Now I have a roadmap for finishing my tweaking.

As an aside, I have learned to leave LLC in Auto when I have Vcore = Normal+0.x. I think if I use a fixed-Voltage Vcore I will set LLC to Extreme. <rubs hands> Soon to the basement to try this stuff.

[Acebmxer]

Re: Haswell Overclocking Guides / Results

Thank you thank you thank you. This explains what I have been seeing. Now I have a roadmap for finishing my tweaking.

As an aside, I have learned to leave LLC in Auto when I have Vcore = Normal+0.x. I think if I use a fixed-Voltage Vcore I will set LLC to Extreme. <rubs hands> Soon to the basement to try this stuff.

See my comments on using fixed vcore and llc extreme. Not a bad thing just something to keep an eye for. Now I just did a push at 4.8ghz with 1.5v set and cpuz showed 1.525v this was with linx 10.3.10.017

Some things I have noticed with my board may cross over to there boards but here are some voltage read outs I have seen while overclocking. These settings were done with LLC set to Extreme

                      Bios                    Dmm full load

Vcore                1.2v-1.35v          0.01v-0.15v Higher
                      1.35v+              0.02v+ Higher
                      1.330v                    1.344v
                       1.5v                      1.525v

vRing                 1.170v                   1.189v

This is what I have tested/seen so far. But look at vcore the closer you get to 1.4v the more the board over volts. Cpuz 1.64.0 and higher seem to show correct vcore at full load compared to a dmm but only 1.64.0 for me show correct idle voltage.

Also noticed when setting fixed voltage for vring with all power saving options enabled in bios vring will also drop low along with uncore speed at idle.

[ehume]

Re: Haswell Overclocking Guides / Results

What does Gigabyte call QPI/VTT in their Haswell mb?
I'm wondering if the 0x124 error code can call for anything other than Vcore.

[Acebmxer]

Re: Haswell Overclocking Guides / Results

in my experience its best to overclock one component at a time. Set uncore to 34x and ram to 1600 or underclock it and just over clock cpu cores. You will still get 0x101 and 0x124 for vcore and for vring and I think system agent.

Over each component separately you at least know which voltage to adjust.

vcore - cpu speed
vring - uncore
system agent - memory controller
vrin can help reduce vcore and stablize high overclocks. vcore should be no closer then 0.400 from vrin. so if using 1.8v vrin vcore should not be higher then 1.4v

[ehume]

Provisional final overclock



Taking advice from more experienced overclockers, I have returned to fixed Voltages. Thanks for your help. Here are my OC settings:

Feature.....Set...........Observed

BCLK........100MHz.....100MHz+/-
CPU..........4.5GHz......4500+MHz
RAM.........1600MHz....~1600MHz
Uncore......4.5GHz

Vcore........1.250V.....1.260V
Vccin........2.000V......2.004V
Vrin..........1.200V
Vrin LLC....Extreme
CPU LLC....Auto
VAXG........Auto.........0.12V
Vdram.......Auto.........1.499V
PCH..........1.090V

Sys Agent. Auto
I/O Analog Auto
I/O Digital Auto

Air cooling: Prolimatech Armageddon heatsink, Gelid GC Extreme TIM.

These are the settings that work best for me. A CPU at 4.6 GHz overheats my chip, throttles it and results in lower GFlops. I tried dropping my PCH to 1.0v and 1.05v and the rig would not POST. I dropped the Uncore to 3.5GHz and saw a little slowing -- down to 129.5 GFlops.

The Observed column above is what the GA-Z87X-UD4H reports in BIOS. I may dig a bit more to see if it reports more numbers somewhere.

So I am running a reasonably stable (fingers crossed) OC of slightly more than 20% (45/37). I have taken a screenshot of a trophy run at 5GHz -- 35% OC (50/37). My i7 860 on a GA-P55A-UD3P got up to 4664 MHz on a trophy run -- a 59% OC (4664/2933). The stable speed on that is 4004 MHz, a 33% OC (4004/2933). I think that I am seeing a reduced OC percent because the baseline factory speed has risen from 2.93GHz on Turbo Boost to 3.7GHz on Turbo Boost. I am waiting for people to come forward with the Ivy Bridge E's. If those OC well I may get one for my daughter -- she does image-editing.

Hmm. It's only July 3rd. I got my chip and MB on June 15. It's only been 2 and a half weeks of fun. Now what will I do?

[profJim]

Re: Haswell Overclocking Guides / Results

Hmm. It's only July 3rd. I got my chip and MB on June 15. It's only been 2 and a half weeks of fun. Now what will I do?

LN 2 overclocking to 7.0⁺GHz.

[ehume]

Re: Haswell Overclocking Guides / Results

LN 2 overclocking to 7.0⁺GHz.

Hmm. I s'pose I should delid first, right? That LN2 might shatter the Intel TIM under the IHS.

[Acebmxer]

Re: Provisional final overclock

[ATTACH]5962[/ATTACH]

Taking advice from more experienced overclockers, I have returned to fixed Voltages. Thanks for your help. Here are my OC settings:

Feature.....Set...........Observed

BCLK........100MHz.....100MHz+/-
CPU..........4.5GHz......4500+MHz
RAM.........1600MHz....~1600MHz
Uncore......4.5GHz

Vcore........1.250V.....1.260V
Vccin........2.000V......2.004V
Vrin..........1.200V
Vrin LLC....Extreme
CPU LLC....Auto
VAXG........Auto.........0.12V
Vdram.......Auto.........1.499V
PCH..........1.090V

Sys Agent. Auto
I/O Analog Auto
I/O Digital Auto

Air cooling: Prolimatech Armageddon heatsink, Gelid GC Extreme TIM.

These are the settings that work best for me. A CPU at 4.6 GHz overheats my chip, throttles it and results in lower GFlops. I tried dropping my PCH to 1.0v and 1.05v and the rig would not POST. I dropped the Uncore to 3.5GHz and saw a little slowing -- down to 129.5 GFlops.

The Observed column above is what the GA-Z87X-UD4H reports in BIOS. I may dig a bit more to see if it reports more numbers somewhere.

So I am running a reasonably stable (fingers crossed) OC of slightly more than 20% (45/37). I have taken a screenshot of a trophy run at 5GHz -- 35% OC (50/37). My i7 860 on a GA-P55A-UD3P got up to 4664 MHz on a trophy run -- a 59% OC (4664/2933). The stable speed on that is 4004 MHz, a 33% OC (4004/2933). I think that I am seeing a reduced OC percent because the baseline factory speed has risen from 2.93GHz on Turbo Boost to 3.7GHz on Turbo Boost. I am waiting for people to come forward with the Ivy Bridge E's. If those OC well I may get one for my daughter -- she does image-editing.

Hmm. It's only July 3rd. I got my chip and MB on June 15. It's only been 2 and a half weeks of fun. Now what will I do?

Glad to see your getting somewhere with your overclock. Yeah my cpu topped at around 4.5-4.6ghz before delidding. If and when you go to delid, I suggest you get some liquid pro and use that on the cores.

Does your cpu need the 2.0v vrin(vccin)? I am only at 1.85-1.9 at a 4.7ghz overclock Some people say leave at auto or default 1.8. At 2.0v you should be just fine just seams little more then should be needed.

4.5ghz uncore @ 1.2v vring???? thats really good. My cpu needs 1.25v for 4.3ghz uncore.

Yeah I am in the same boat as you got OC finalized and now what to do???? Wish I had some LN2 to play with.

[ehume]

Re: Provisional final overclock

Glad to see your getting somewhere with your overclock. Yeah my cpu topped at around 4.5-4.6ghz before delidding. If and when you go to delid, I suggest you get some liquid pro and use that on the cores.

Does your cpu need the 2.0v vrin(vccin)? I am only at 1.85-1.9 at a 4.7ghz overclock Some people say leave at auto or default 1.8. At 2.0v you should be just fine just seams little more then should be needed.

4.5ghz uncore @ 1.2v vring???? thats really good. My cpu needs 1.25v for 4.3ghz uncore.

Yeah I am in the same boat as you got OC finalized and now what to do???? Wish I had some LN2 to play with.

I'm not sure about Vccin of 1.9v. Seems it wasn't enough when I was doing cpu = 4.6. I may have tried it; can't remember. I could try dropping it, but I know 1.8v isn't enough. And when the BIOS readout shoows Vccin pulling 2.004v, I suspect I have the right Voltage. But I will try to lower it. Thanks. Good suggestion.

BTW -- Vccin is the Vring Override. When I figured that out, I nudged up the Vrin to where I could drop Vcore and raise the Uncore speed. I like having cpu=uncore. I'm not sure if it will make much of a difference, but it is satisfying and there is no heat penalty . . . which is why I'm not overclocking my RAM. I have no margin for extra heat.

BTW2 -- We are playing with one one-hundredth of a Volt when we go from 1.24v to 1.25v. And to go frpom 1.85v to 1.9v is still one twentieth of a Volt. These are mind-bogglingly small differences.

[ehume]

Re: Haswell Overclocking Guides / Results



I dropped Vccin to 1.9v. As usual, dropping Voltage dropped performance. In this case, the processing speed dropped more than 1GFlops. While the hottest core temp is the same at 97c, it did not reach that until almost the end, where in the results of Vccin=2.000v the core temp reached 97c mid-way.

Note here there is a consistency: the difference between the hottest and the least hot core was 12c.

[ehume]

Re: Haswell Overclocking Guides / Results

Vccin = 1.7 Volts (!)



Dropped Vccin to 1.800v. It was fine. Dropped it to 1.750v. It was fine. Dropped Vccin to 1.700v: the LinX AVX performance actually increased to 130Gflops. The max temp on Vccin 1.75v was 94c. The rise in temp to 95c on Vccin=1.7v represented a rise in the ambient temp.

Dropped Vccin to 1.600V. LinX AVX crashed Windows some time in the middle of the run (I had gone out and missed it).

Sorry. I forgot how to upload more than one image. Continued next post.

Edit: actually, I'll just tell you: LinX AVX ran fine with Vccin=1.65v, making 129 Gflops and max core temp of 94c.

I'll put the specs in my sig. I'll be raising Vccin to 1.67v, just because I like it.

But in BIOS, with Vccin=1.65v, Vrin was 1.644v. With Vccin=1.67v, Vrin is 1.68v. Tiny difference.

[Acebmxer]

Re: Haswell Overclocking Guides / Results

When posting pics upload them to another site like imageshack or photobucket and post links to the pics here.

[boondocks]

Re: Haswell Overclocking Guides / Results

Have you guys tried running the latest Prime 95? I could get Aida stable for hours but small fft's in P95 killed me after a while. I was using v27.7 though, didn't realize there was a v27.9 out.

Right now I'm waiting to get a new board/cpu since I'm selling the current rig. Already bought new gpu's & SSD's but I'm waiting to get paid for "old" rig before I buy mobo and cpu. The 16GB RAM kit already went up $50........

[Acebmxer]

Re: Haswell Overclocking Guides / Results

This was taking from a post over at XS forum. Have not tried this my self yet.

You can still run Linpack from the command line if you wanna heat your Haswell :p:

Download Linpack from Intel:


Unpack and go to folder (this is for version 11.0.5.009):
w_lpk_p_11.0.5.009\linpack_11.0.5\benchmarks\linpa ck

Edit lininput_xeon64 file, for example, for 4GB RAM the problem size is 23118 (you can check Linx which problem size you wish to run):

Sample Intel(R) Optimized LINPACK Benchmark data file (lininput_xeon64)
Intel(R) Optimized LINPACK Benchmark data
1                        # number of tests
23118 # problem sizes
23118 # leading dimensions
30  # times to run a test
4  # alignment values (in KBytes)

Run runme_xeon64.bat

Results will be in win_xeon64.txt file

That's it :)

[stasio]

Re: Haswell Overclocking Guides / Results

I started..........so easy DDR3-2800......
CR1 @ 1.65V (2nd & 3th timing auto,CPU @3.6)