Haswell Overclocking Guides / Results

[ehume]

Re: Haswell Overclocking Guides / Results

So I upped the cpu to 4.4GHz, but it still got too hot and I had to cut Linpack short. So I dropped the cpu speed to 4.2GHz and reduced some Voltages. Linpack still got too hot, but I was able to grab one rep before I killed it:

Intel(R) Optimized LINPACK Benchmark data

Current date/time: Sun Jul 07 16:08:45 2013

CPU frequency: 4.198 GHz
Number of CPUs: 1
Number of cores: 4
Number of threads: 4

Parameters are set to:

Number of tests: 1
Number of equations to solve (problem size) : 25000
Leading dimension of array : 25000
Number of trials to run : 20
Data alignment value (in Kbytes) : 4

Maximum memory requested that can be used=705536800, at the size=25000

=================== Timing linear equation system solver ===================

Size LDA Align. Time(s) GFlops Residual Residual(norm) Check
25000 25000 4 50.371 206.8246 5.194889e-010 2.954147e-002 pass

206 Gflops from AVX2.

[Acebmxer]

Re: Haswell Overclocking Guides / Results

soo Linpack 11.0.5 works but when run from cmd window? not through gui?

[ehume]

Re: Haswell Overclocking Guides / Results

soo Linpack 11.0.5 works but when run from cmd window? not through gui?

Linpack does not have a GUI. LinX and IBT and OCCT provide GUI's for Linpack.

I cannot get my LinX to work with Linpack 11 more than one rep, even at default speed. Hence my using the script.

[Acebmxer]

Re: Haswell Overclocking Guides / Results

Sorry thats what I ment Linx's gui.

So running linpack 11 from script works Ill to try. was it from the little snippit I posted or can you post your script

[ehume]

Re: Haswell Overclocking Guides / Results

Sorry thats what I ment Linx's gui.

So running linpack 11 from script works Ill to try. was it from the little snippit I posted or can you post your script

I modified the data input file to this:

Sample Intel(R) Optimized LINPACK Benchmark data file (lininput_xeon64)
Intel(R) Optimized LINPACK Benchmark data
1                         # number of tests
25000 # problem sizes
25000 # leading dimensions
20    # times to run a test
4     # alignment values (in KBytes)

Note that the name of the file is lininput_xeon64. You may wish to copy and rename the original as lininput_xeon64_old or some such. Also, I had to disable HT. Finally, do nursemaid the initial runs with something like Real Temp. It doesn't take long (50 seconds per rep at 4.2GHz) but the system gets really hot really quickly -- hotter than with Linpack 10.

[Acebmxer]

Re: Haswell Overclocking Guides / Results

What am I doing wrong???? When fully loaded Realtemp show 50% load and only core 0 and core 1 are heated up.

Intel(R) Optimized LINPACK Benchmark data

Current date/time: Mon Jul 08 01:37:41 2013

CPU frequency:    3.898 GHz
Number of CPUs: 1
Number of cores: 4
Number of threads: 8

Parameters are set to:

Number of tests: 1
Number of equations to solve (problem size) : 25000
Leading dimension of array                  : 25000
Number of trials to run                     : 20   
Data alignment value (in Kbytes)            : 4    

Maximum memory requested that can be used=705536800, at the size=25000

=================== Timing linear equation system solver ===================

Size   LDA    Align. Time(s)    GFlops   Residual     Residual(norm) Check
25000  25000  4      105.408    98.8342  5.194889e-010 2.954147e-002   pass
25000  25000  4      105.412    98.8303  5.194889e-010 2.954147e-002   pass

Sample Intel(R) Optimized LINPACK Benchmark data file (lininput_xeon64)
Intel(R) Optimized LINPACK Benchmark data
1                        # number of tests
25000 # problem sizes
25000 # leading dimensions
20   # times to run a test
4   # alignment values (in KBytes)

[Acebmxer]

Re: Haswell Overclocking Guides / Results

Not sure for a 4700k didn't know they made such a beast. As for disabling HT and what temp, Vcore drop you get not sure. I think I tried to disable HT and saw 0 improvement but I was still learning (not that I have finished learning) how to overclock haswell. I could try again since I need to retest settings for new bios came out. A lot has changed since the first "i" series cpus (socket 1366).

After more testing, seems disabling HT still helps but not until higher clocks. When I first tested I tested at 4.5ghz, at 4.8ghz with HT on cpu is unstable at 1.4v with linx. Disable HT and CPU is stable might be able to drop volts. Gonna see how far I can push with HT disabled. I think my cpu at 4.9ghz and HT enabled I need around 1.49v.

[boondocks]

Re: Haswell Overclocking Guides / Results

After more testing, seems disabling HT still helps but not until higher clocks. When I first tested I tested at 4.5ghz, at 4.8ghz with HT on cpu is unstable at 1.4v with linx. Disable HT and CPU is stable might be able to drop volts. Gonna see how far I can push with HT disabled. I think my cpu at 4.9ghz and HT enabled I need around 1.49v.

Have you delidded Ace?

[Acebmxer]

Re: Haswell Overclocking Guides / Results

Have you delidded Ace?

ummm yes cpu has been delidded long time now.


Seems my cpus like 4.7ghz with HT. anything higher takes to much voltage for my liking. Cpu will not boot to windows at 50x with ht disabled at 1.525v when it needs 1.330v for 4.7ghz w/HT linx stable.

So yes Disabling HT will help some but these cpus all act differently. Mine disabling ht does not help until higher clocks, but voltage does not scale well with cpu speed after 4.7ghz.

[boondocks]

Re: Haswell Overclocking Guides / Results

ummm yes cpu has been delidded long time now.


Seems my cpus like 4.7ghz with HT. anything higher takes to much voltage for my liking. Cpu will not boot to windows at 50x with ht disabled at 1.525v when it needs 1.330v for 4.7ghz w/HT linx stable.

So yes Disabling HT will help some but these cpus all act differently. Mine disabling ht does not help until higher clocks, but voltage does not scale well with cpu speed after 4.7ghz.

Long time, huh? lol. I got a delidded 3770K I'll sell you, I guarantee it'll go higher than 4.7.
I didn't get a chance to try 4.7 on my 4770K, have to wait until the next one I guess.

[stasio]

Re: Haswell Overclocking Guides / Results

So far DDR3-2933 booting with my samsung @ 1.70V (not fine tune yet).

[boondocks]

Re: Haswell Overclocking Guides / Results

So far DDR3-2933 booting with my samsung @ 1.70V (not fine tune yet).

Wow. How high can you go while the cpu is overclocked?

[stasio]

Re: Haswell Overclocking Guides / Results

Wow. How high can you go while the cpu is overclocked?

This will be my next step,as my memory 2933 coming next week.
Just testing CPU IMC atm.....

[boondocks]

Re: Haswell Overclocking Guides / Results

I'm getting ready to buy some new RAM and I'm wondering if 2400 is OK with a 4.5 overclock. If not I'll just stick with the 1866 Predator, I had zero problems with it.
Actually I forgot I still got two sticks of 2400 TridentX I haven't tried yet...

[stasio]

Re: Haswell Overclocking Guides / Results

I think all new RAM's (for Haswell) is OK.
I saw so many posting with 3th generation (IB) no problem 2800-2933 and older 2400-2666+.

Btw,
I have new Intel MicroCode Rev.09 ID: 0x326C309 Date: 04/04/2013.......will post soon.
GB still using 07.