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post #1 of 21 (permalink) Old 05-22-2019, 03:06 PM - Thread Starter
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Xeon E5 1680 V2

Hello again,

Now the 3770K & 3930K have been overclocked to 4.4 Ghz & 4.2 Ghz respectively - maybe with a little room to go higher on the 3770K I'm about to have a go at a Xeon E5 1680 V2 8C16T Ivy Bridge processor that was available at a lot cheaper price.

A little worrying it had a tiny burn mark on the CPU land pads (the gold contacts) which got me really worried.

I've got the system booted with Asus X79 Deluxe a nice motherboard!

C-states is switched on and one or two other things like turbo but it's not time to overclock just yet.

I've got P95 29.4 running the CPU at stock with turbo at 3.9 Ghz on all cores and it's churning away.

Looking at CPU-Z the v-core looks very low - it is at around 0.500v-0.560v - I don't know what load line calibration is set to but I did update the BIOS so it may be on auto.

It seems to me that the voltage is very low compared to other CPU's and that Xeon are better binned etc.....(please comment)

After 30 minutes hottest core was 60 C maybe on 2-3 cores with Phanteks air cooler.

I don't want to go over 70C if I can help it - TJMAX is 95C according to CORE TEMP.

What v-core will be needed to get to 4.2 Ghz & 4.4 Ghz on all cores? (I'll find out anyway)

But considering the v-core is currently under 0.600v @ tubo 3.9 Ghz it shouldn't take to much more v-core to sustain 4.2 Ghz?

Any comments (I'm not expert yet)---thanks
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post #2 of 21 (permalink) Old 05-22-2019, 03:10 PM
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It will take about 1.3v ish to get to 4.2 also you want to avoid burning pins and pads???? stop with the P95 stuff. It is known that just because it can run P95 doesn't mean it wont crash on certain work loads. If you have good airflow on the VRM and a good cooler I would try 4.2 at 1.265v and see what happens. Awesome chip by the way.
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post #3 of 21 (permalink) Old 05-22-2019, 04:14 PM
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P95 is not representative of real-world use, but people still use it for some reason. Use something more realistic like RealBench stress test. For the 1680 V2, I had to use version 2.4 since the newer versions would crash. When starting the stress test, tick off the box in the blender run so you're not running your graphics card.

These are the settings I use on my 1680 V2, though I'm using a R4BE so you might have to translate some stuff for your board.

LLC Very High (second to last)
Offset vcore to whatever gives you around 1.344-1.360v peak voltage
1.65v dram
1.1v vtt
1.1v vccsa
Disable current capabilities limit
x45 multi
Enable PLL overvoltage

I would stay under 80C on these chips as I've had some bluescreens when going beyond that. Thermal Grizzly Kryonaut also likes to dry up when beyond 80C or so as well.

For your low vcore reading, every once in a while I'll get that as well. Just double it.

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Last edited by airisom2; 05-22-2019 at 04:21 PM.
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post #4 of 21 (permalink) Old 05-22-2019, 08:02 PM - Thread Starter
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Right OK in the BIOS the stock v_ core is 0.940 (or close)_which seems quite close to the 0.970v of the 3770K.

I did keep notes of the previous overclocks (3770k&3930k)_info obtained from the forum here and elsewhere.

I did try Real bench but it did cause crashes due to nVidia or AMD GPU (not sure which is the offender)_could be nvidia as I has GT710 in at the time.

I've used P95 because lots of others do but I don't want to argue about this (I'm no expert)_

I'll do the 4.2 OC and see where the temps go and I'll be carful with the settings.

I really did take my time on the 1st two OC's and got good results > increase clock speed over stock and temps in a good place

3930K @ 4.2 Ghz - 68C hottest core (+- 1or2C)
3770K @ 4.4 Ghz - 66C hottest core - with more room to go to 4.6 Ghz (105 TJMAX)

E5 1680 V2 has +4C TJMAX over 3930K @ 95 degrees C - I'll post a pic or two when I'm done
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post #5 of 21 (permalink) Old 05-22-2019, 08:07 PM - Thread Starter
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Quote: Originally Posted by Moparman View Post
It will take about 1.3v ish to get to 4.2 also you want to avoid burning pins and pads???? stop with the P95 stuff. It is known that just because it can run P95 doesn't mean it wont crash on certain work loads. If you have good airflow on the VRM and a good cooler I would try 4.2 at 1.265v and see what happens. Awesome chip by the way.
1.3v_core seems quite a bit more than 0.940v for the stock voltage with 3.9 Ghz turbo - and 4.2 Ghz is only 300 Mhz more (I'll see how it goes)_and post_thanks
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post #6 of 21 (permalink) Old 05-23-2019, 06:28 PM - Thread Starter
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OK so it's now approaching 4 hours of P95 29.4 - V-Core_in_BIOS____=1.130_v

As you'll see the temps are very good on air - Phanteks TCPH14 big air cooler - I will mention more later on about what is in BIOS but this is 8 cores / 16 threads which is doing better than the i7 IVY 3930K 6C/12T @ 4.2 Ghz of which can be proven here !!!

RAM is 1600 Mhz HYPER X small heat spreaders (Kingston)_doesn't say on box!- On Asus P9X79_Pro_2133_Mhz_was the best I could get from either 2400_Mhz sticks or 2133 Mhz sticks. The RAM inside ASUS X79 DELUXE right now is 1600 Mhz - It didn't seem to want to go above 1600 Mhz or I got the ERROR code 53 on boot-up (or should I say NOT boot up_!!!)_ XMP was not attempted - Brief comments about this helpful.

I'll post another thread / reply later with some more BIOS specific detail.

This is OC #3 and is going quite well -Recap is manual V-Core= 1.130_v

What did occur in P95 @ 1.100_V_CORE_____all the way___up_to__1.120_v-core___was___Some cores maybe 1, 2 or 3 cores would show 60% loading in CORE TEMP.

A quick PASSMARK test was done before BIOS tweaking @ 4.2 Ghz which shows 18,000 points - compared to 16,9xx on 3.9 Ghz turbo - And temps are better on the manual overclock --- I think CPU PLL was reduced from 1.800_v down to 1.650_v which may be why the TEMPS are better on the manual OC vs STOCK 3.9 TURBO yesterday.

Enough for now - but there is room for 200 Mhz more eg-- 4.4 Ghz and keeping temps under 70 C - which is a must --- How much more v_core is needed I'm not sure but we'll find out...………….
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post #7 of 21 (permalink) Old 05-24-2019, 09:33 AM - Thread Starter
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Hello again,

OK, at the mo. I'm using P95 29.4 - I've read others here may use X264 and OCCT which I'll take a look at later on. To start off with I did use Asus Real Bench but found out it was the causing a problem because of a nVidia GPU - The problem I've got with Asus Real Bench is when I first used it it was my first OC and I thought there was a problem with my settings in the BIOS making the OC not work properly which was not the case as it was Asus Real Bench causing the problem but having said all that I did like how it looked so if all the problems are fixed I'd use it again.

P95 was the next obvious choice which is being used right now....(then later on X264 & OCCT)_OK a question if you don't mind!

In P95 when the v core isn't sufficient the load in the cores drops below 100% - I've seen this several times now so the v core is increased slightly, OK, but.....on the current OC for this Xeon E5 1680 V2 the v core was @ 1.230_v with some cores dropping below 100% but only briefly then returning to 100% so I've gone to BIOS to up v core to 1.235_v & 1.240_v respectively so at 1.240_v I've seen a momentary dip on core 0 below 100% then straight back up to 100%.

Because all of us are trying to run with minimum voltages this is bound to occur but the question I have is when I was @ 1.230_v there were maybe 2 or 3 cores dropping below 100% briefly but at 1.240_v it was only one of the cores so as the v core is increased this issue decreases - But with increased v core there is more heat to deal with...…..

None of this has made P95 fail a test and flag an error so is any core loading under 100% that is acceptable? / allowed (is it safe to go with it?)_or is it best to increase v_core? - A final nuance in an OC -

Max. temp. @ 4.4 Ghz E5_1680_V2 is 65 C - (not current temp_but_max)_Any comments? -Thanks
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post #8 of 21 (permalink) Old 05-24-2019, 11:32 AM - Thread Starter
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Quote: Originally Posted by Moparman View Post
It will take about 1.3v ish to get to 4.2 also you want to avoid burning pins and pads???? stop with the P95 stuff. It is known that just because it can run P95 doesn't mean it wont crash on certain work loads. If you have good airflow on the VRM and a good cooler I would try 4.2 at 1.265v and see what happens. Awesome chip by the way.
Currently at 1.240_v_core with load on one or two of the cores temporally dropping to 99% (blink of an eye EZ to miss) _____Would increasing current capability settings in BIOS assist in this nearly 100% OC?

*that is assuming P95 doesn't and or Core Temp doesn't have a little bug! - (remember Asus Real Bench_crash_nVidia_GPU !!!)
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post #9 of 21 (permalink) Old 05-24-2019, 01:30 PM
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Nice OC you should have much more headroom. Might have a 4.6-4.8 chip never know.
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post #10 of 21 (permalink) Old 05-24-2019, 03:06 PM - Thread Starter
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Quote: Originally Posted by Moparman View Post
Nice OC you should have much more headroom. Might have a 4.6-4.8 chip never know.
Yes thank you very much - This is my #3 OC - I need all the help I can get for answers please help!!! - Regarding P95 29.4 and very brief core loading in Core Temp going under 100% load (99%) very briefly -Is this just a peculiarity in Core Temp? - or P95? - Or is this the efficiency of the CPU "being lost" at 4.4 Ghz in relation to 4.2 Ghz?

I'm reviewing my notes @ 4.2 Ghz - v_core_1.130_v_with droop_in_CPU-Z_0.536_v___0.544_v__0.560_v__max temp__56_C___P95__6_hours_17_mins
OK at 4.4 Ghz__I've used__1.250_v_core___with_droop_in_CPU-Z__0.608_v__0.616_v___max temp @ 1hr__=67 C

So basically the 200 Mhz extra has cost 11 C which may not be worth it?

I'll run PASSMARK later to see how much over 18195 it will go for CPU score

Please comment on CPU load loss in Core Temp from 100% >>>99% briefly - This may be nothing and no errors are present in P95.

At lower v-core @ 4.4 Ghz @ 1.175_v_core__there were 4 cores simultaneously dropping below 100% maybe to 50-60-% which indicated not enough V-CORE (obvious)__but little tiny fluctuations above are subtle and may not matter.

And yes this is my 1st Xeon chip due to cost I'm an i7 man! - It will be interesting how the 5960X compares to this when its time to OC -! - Thanks
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