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  1. #21
    New ROGer Array Skunkfoo PC Specs
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    Quote Originally Posted by Silent Scone View Post
    I've just picked up a 7940X and using heavy custom water, I'll let you know how I get on. It's a fairly disregarded SKU due being in the middle of the pack. I'd be happy with 4.6, anything above this is a bonus. As for self imposed voltage limits, I wouldn't stray over 1.3v for light workloads (non AVX). 1.25v for high current workloads
    Thanks, do keep my updated on your OC adventures. My 7940x gets 4.6 no problem with HWInfo reporting highest voltages at 1.246. I'm sure I could get 4.7 stable around 1.28-1.3... already got it fairly stable at 1.282 using manual mode. I didn't want to go higher before knowing what a safe voltage was. As far as temps I have lots of room in my custom loops. I'm more concerned about ruining what I think is a decent chip.

    Back in the day before I thought all you had to do was worry about temps, I have been running my 4930K at a constant fixed frequency of 4.4 GHz and 1.408 manual voltage since 2014. I'm not about to send 1.4+ or even 1.3+ to my new 7940x anytime soon.

  2. #22
    Administrator Array Silent Scone@ASUS's Avatar
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    Quote Originally Posted by Skunkfoo View Post
    Thanks, do keep my updated on your OC adventures. My 7940x gets 4.6 no problem with HWInfo reporting highest voltages at 1.246. I'm sure I could get 4.7 stable around 1.28-1.3... already got it fairly stable at 1.282 using manual mode. I didn't want to go higher before knowing what a safe voltage was. As far as temps I have lots of room in my custom loops. I'm more concerned about ruining what I think is a decent chip.

    Back in the day before I thought all you had to do was worry about temps, I have been running my 4930K at a constant fixed frequency of 4.4 GHz and 1.408 manual voltage since 2014. I'm not about to send 1.4+ or even 1.3+ to my new 7940x anytime soon.
    This CPU can do 4.7Ghz non AVX with 1.25v and Mesh 3Ghz at around 1.04v. Temps help, though. 4.6 is still very good for 14 cores.

  3. #23
    New ROGer Array Skunkfoo PC Specs
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    MotherboardASUS ROG Rampage VI Extreme
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    I'm jealous

    Quote Originally Posted by Silent Scone View Post
    This CPU can do 4.7Ghz non AVX with 1.25v and Mesh 3Ghz at around 1.04v. Temps help, though. 4.6 is still very good for 14 cores.
    4.7 @ 1.25... I'm jealous. 4.7 seemed so much faster than 4.6. Is your chip delidded? Are you saying that if you ran AVX your OC isn't stable anymore?

    I will attempt 4.7 again once I teardown my loop to clean it out... EK failed me and a brand new loop got all gunked up on day 1 after I added the EK CryoFuel clear concentrate.

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  4. #24
    Administrator Array Silent Scone@ASUS's Avatar
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    AVX offsets are currently 2 for AVX and 3 for AVX 512. 4.7 is non AVX. No, my chip is not delidded yet. If you're aiming for 4.7GHz AVX you might be hunting a while. 4.6 is still good for 14 cores.

    That's unfortunate! I only ever use clear premix personally. EC6 from XSPC.*

  5. #25
    New ROGer Array Skunkfoo PC Specs
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    4.7 non AVX would be fine (4.8 at 1.3 with a blessing even better)

    Quote Originally Posted by Silent Scone View Post
    AVX offsets are currently 2 for AVX and 3 for AVX 512. 4.7 is non AVX. No, my chip is not delidded yet. If you're aiming for 4.7GHz AVX you might be hunting a while. 4.6 is still good for 14 cores.

    That's unfortunate! I only ever use clear premix personally. EC6 from XSPC.*
    Yeah I used clear to avoid dye separation and the gunking up I ended up experienced anyways.

    I will try 4.7 on 2 best cores and see if I can get it stable at 1.26 on those 2. My build is not for 24/7 cpu number crunching, just a game here and there and Microsoft office stuff. But I do run a few Virtual Machines simultaneously and i like to give them lots of cores and ram. The VMs themselves arent usually stressed either. I do a lot of coding and like my builds/compilations to go really fast and I find high CPU frequency is a big plus.

  6. #26
    Major Asshattery Array Protocol PC Specs
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    Figured I would share my experience with the 7940X so far. Granted it's only been about a week since I've built this, after stressing my new build at default settings for a few days it passed no problem. I'm taking it gingerly for now - nothing too extreme. Overall I am very pleased with 4.5 GHz, but the damn thermals are just ridiculous.

    Worked my way up from 4.4 GHz to 4.6 GHz (all-cores), but I am hitting a 90C wall at 4.6 GHz (~1.218v). I've ultimately settled on 4.5 GHz @ ~1.186v for 24/7. AVX is just too toasty. I get thermal throttling at anything above a -5 offset. It's not the loop either - it never breaks 33C. I settled on a -6 for AVX512 and -5 for AVX. I just can't get the heat out of the package quick enough. I'm not delidded, but I'd image my TIM job is rather poor under there. Silicone-wise it looks like a good win based on the voltages.

    I'm using the offset method to get these clocks. -0.064 for 4.5 GHz all-core. Load-Line at Level 3, 140 % current with ASUS Optimized phase control. Using XMP 3200 profile and CPU VCCIN on auto also. Cache all running stock (auto).

    System passes a 2-hour RealBench stress run with no throttling - max core temp of 89C. I haven't tested any longer than that except for a 2-hour AIDA64 stress test (CPU-only).

    Have you guys experienced any significant temperature decreases from "standard", "optimized" and "extreme" phase profiles?
    Last edited by Protocol; 11-13-2017 at 10:40 PM.
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  7. #27
    Administrator Array Silent Scone@ASUS's Avatar
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    Leave phase profiles at defaults, simply increase the current limit. If the CPU has not been delidded, AVX range is limited. You're pulling 300W+ through the die, and you're not able to pull the heat away fast enough. You can set a small offset for cache and keep voltages low. Should be able to reach 3Ghz with 1.05v or less, this can help with temps. Lowering VCCIN whilst checking for stability can help, too.

    Short of that, you'll need to delid the CPU.

  8. #28
    ROG Member Array Kalorn PC Specs
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    Not bothered really pushing mine to see what I can get.

    Settled myself on 4.5 GHz @ 1.2V - system is happy and in general under heavy (not extreme) load maxxes out around 65-70C. Extreme load (i.e benchmarking it can hit up to 95C (as shown on my realbench score).

    May have to at some point delid it - but not fussed myself, I think I will be more than happy to sit at this for the foreseeable future, unless I get around to finally doing a full water cooled system rather than just using an AIO.

  9. #29
    New ROGer Array Skunkfoo PC Specs
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    Need custom water to unlock full potential

    I had a Thermaltake 360 Floe AIO for bench testing. Anything above 4.5 couldn't pass Aida64 CPU System Stability Testing due to 90C+ temps then thermal lockup/shutdown. I even tried seating the CPU 2 times to make sure the TIM was evenly spread and the block made proper contact with the IHS.

    I may get the CPU delidded down the road if I find that I can safely pump more volts into the Chip (like 1.3+). But for now i'm under custom water cooling and I'm now at 46/47/48 GHz. Using Adaptive gave best results and thermals once I figured it out. Doing OC By Specific Core really helped fine turn each core based on its characteristics.

    For example:
    12 cores are set to 4.6 GHz with max voltages between 1.208 and 1.247
    1 core is set to 4.7 GHz with max voltage @ 1.251
    1 core is set to 4.8 GHz with max voltage @ 1.254

    Cache Frequency is currently set to a modest 2800 MHz with .01 + Offset (I have a goal of 3200 MHz and will take baby steps keeping all other OC settings the same)

    DRAM Speed set to 3600 MHz on a 3733 MHz kit using Auto on all settings. Every time I try to set 3733 using all Auto my system cant ever stay stable for long no matter what Cache and CPU frequency I use. I haven't gotten around to playing with and trying to tighten the timings on the DRAM yet.

    Side Note: Anyone been able to get Intel Turbo Boost Max Technology 3.0 to actually have a targeted application use the top performing core(s) yet? No matter how I configure the application I cant get my Test Subject Game (Heros of Newerth) to always run on the 4.8 GHz core.

  10. #30
    Administrator Array Silent Scone@ASUS's Avatar
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    Quote Originally Posted by Skunkfoo View Post
    I had a Thermaltake 360 Floe AIO for bench testing. Anything above 4.5 couldn't pass Aida64 CPU System Stability Testing due to 90C+ temps then thermal lockup/shutdown. I even tried seating the CPU 2 times to make sure the TIM was evenly spread and the block made proper contact with the IHS.

    I may get the CPU delidded down the road if I find that I can safely pump more volts into the Chip (like 1.3+). But for now i'm under custom water cooling and I'm now at 46/47/48 GHz. Using Adaptive gave best results and thermals once I figured it out. Doing OC By Specific Core really helped fine turn each core based on its characteristics.

    For example:
    12 cores are set to 4.6 GHz with max voltages between 1.208 and 1.247
    1 core is set to 4.7 GHz with max voltage @ 1.251
    1 core is set to 4.8 GHz with max voltage @ 1.254

    Cache Frequency is currently set to a modest 2800 MHz with .01 + Offset (I have a goal of 3200 MHz and will take baby steps keeping all other OC settings the same)

    DRAM Speed set to 3600 MHz on a 3733 MHz kit using Auto on all settings. Every time I try to set 3733 using all Auto my system cant ever stay stable for long no matter what Cache and CPU frequency I use. I haven't gotten around to playing with and trying to tighten the timings on the DRAM yet.

    Side Note: Anyone been able to get Intel Turbo Boost Max Technology 3.0 to actually have a targeted application use the top performing core(s) yet? No matter how I configure the application I cant get my Test Subject Game (Heros of Newerth) to always run on the 4.8 GHz core.
    Assuming you've applied the profile, some games don't work well with IBT. You can always try handing it over to native control and see if that helps. Personally, have seen mixed results with that.

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