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Overclocking Broadwell i5-5675c - Page 2

post #11 of 20
Quote:
Originally Posted by BaK2BaK View Post

Thx everyone, until I find time to look at your posts properly, here comes my HWinfo sensors screenshot:


So it looks like the CPUZ Vcore value is actually the VID value, right?

But how come a VID of 1.414V is under the min idle VID value (1.5V) of the Intel's table?
/me is still confused... eh-smiley.gif

I'm not sure, but there's no way 1.5V is the core's minimum VID. Heck, 1.5V is the is the max safe load voltage of my ancient 45nm Phenom II X4. There's no way a 14nm core could take 1.85V and live.


As others mentioned, VID in the table you found might mean VCCIN... But that doesn't make sense to me either, as I'm pretty sure broadwell got rid of the integrated VRMs.
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post #12 of 20
Quote:
But how come a VID of 1.414V is under the min idle VID value (1.5V) of the Intel's table?

"VID" in that program and some others like it are referring to a completely different thing than "VID" on Intel's table. You should just ignore everything that says "VID" and go by Vcore, VCCIN etc instead.
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post #13 of 20
That VID is the base voltage for cores the cpu is asking, but not what it's been used in reality. In the HWInfo you need to look for VCCIN and Vcore.

VID from intel specs is the VCCIN from HWInfo and most motherboard manufacturers. VID from those sources is the same as the voltage showed in CPU-Z, but it's not the actual VID from intel, neither the true voltages from cores.
post #14 of 20
Don't expect big overclocks on these. They're derived from laptop parts and are meant to be powerful and efficient. The stars of the show are the irisPro and the massive pool of 128 md L4 cache.

I can't wait for mine to arrive today smile.gif
post #15 of 20
Thread Starter 
Quote:
Originally Posted by Weber View Post

The Adaptive Thermal Monitor will kick in at a temperature derived from power, see below. You can tell if the limit is on by opening the XTU graph, enable display of power limit throttle. Use some software to fully engage the cpu cores.

Table 24. Boundary Conditions, Performance Targets, and TCASE Specifications (page 72)

TCASE-MAX @ Platform TDP6: 71.3 °C = 0.41 * (Power, example 65w tdp) + 44.6

5. Maximum TCASE Thermal Profile is the specification that must be complied to. Any Attempt to operate the processor
outside these operating limits may result in permanent damage to the processor and potentially other system
components.
Not sure to understand all that, here is what I get during a 30min OCCT run:

Looking at the curve of the Power Limit Throttle makes me think the Adaptive Thermal limit is ON, right?
And?

Quote:
Btw, you're not the first OCN member with Broadwell, there has been a lot fo discussion in this thread: http://www.overclock.net/t/1558449/various-intel-i7-5775c-i5-5675c-broadwell-reviews
Thanx for the link, search function didn't return this thread when I looked for 'Broadwell'.
Reading it right now, 10 pages left, makes me realize I should update my overclocking method/knowledge. Should I better look at a Haswell overclocking guide for that or a Skylake one?

Quote:
Originally Posted by Ansau View Post

That VID is the base voltage for cores the cpu is asking, but not what it's been used in reality. In the HWInfo you need to look for VCCIN and Vcore.

VID from intel specs is the VCCIN from HWInfo and most motherboard manufacturers. VID from those sources is the same as the voltage showed in CPU-Z, but it's not the actual VID from intel, neither the true voltages from cores.
Thanx for clarifying all this!

Found the VCCIN value, but not the VCORE one. I doubt it's the VCOREREFIN...?


Quote:
Originally Posted by Ansau View Post

There's no relation, as VID voltage from specs is the VCCIN voltage, and there's no indication for the core voltage.
We can predict the max safe voltage for Broadwell comparing with the closest chips from intel, Haswell (same architecture) and Skylake (same process). Both have the maximum at 1.45v, so I'd assume the same for Broadwell, yet I think it can run a bit more voltage, since both Broadwell and Skylake run higher stock voltages than Haswell.

So 1.792V VCCIN (= Intel VID), which means I still have some room left before Intel max VID of 1.86V.
Some room left but to stay safe I shouldn't get higher than 1.45V in the UEFI.
Am I right?
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post #16 of 20
Yeah, VCCIN from HWinfo is the VID from intel. The core voltage should appear like Vcore, but it can be different since it gets the information from the MB, and each brand puts their own name.

For overclocking look for Haswell, as both are base on the same architecture, and I suppose stressing AVX2 in Bradwell is as bad as Haswell.

1.45v is just an orientation, no one really knows the maximum safe voltage (I also think it can vary between different chips, the same as 2 chips have different frequencies at the same voltage). If temps are good and you're not using the computer at max most of the day, I'd say such high voltages are ok.

About the image, your cpu is clearly power limited. Check in the bios or in XTU any setting about power limit and change it to accept high power. Make sure you have the latest bios.
post #17 of 20
Quote:
Originally Posted by Ansau View Post

Yeah, VCCIN from HWinfo is the VID from intel. The core voltage should appear like Vcore, but it can be different since it gets the information from the MB, and each brand puts their own name.

For overclocking look for Haswell, as both are base on the same architecture, and I suppose stressing AVX2 in Bradwell is as bad as Haswell.

1.45v is just an orientation, no one really knows the maximum safe voltage (I also think it can vary between different chips, the same as 2 chips have different frequencies at the same voltage). If temps are good and you're not using the computer at max most of the day, I'd say such high voltages are ok.

About the image, your cpu is clearly power limited. Check in the bios or in XTU any setting about power limit and change it to accept high power. Make sure you have the latest bios.

This ^^. Raise current and power limits wherever you see them in the BIOS, otherwise your CPU will throttle like crazy.
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post #18 of 20
Quote:
Originally Posted by BaK2BaK View Post

Not sure to understand all that, here is what I get during a 30min OCCT run:

Looking at the curve of the Power Limit Throttle makes me think the Adaptive Thermal limit is ON, right?
And?
Thanx for the link, search function didn't return this thread when I looked for 'Broadwell'.
Reading it right now, 10 pages left, makes me realize I should update my overclocking method/knowledge. Should I better look at a Haswell overclocking guide for that or a Skylake one?
Thanx for clarifying all this!

Found the VCCIN value, but not the VCORE one. I doubt it's the VCOREREFIN...?

So 1.792V VCCIN (= Intel VID), which means I still have some room left before Intel max VID of 1.86V.
Some room left but to stay safe I shouldn't get higher than 1.45V in the UEFI.
Am I right?

Yes that is the input voltage to the CPU, the VCore is different and more important.
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post #19 of 20
Probably because the VID intel speaks about in that sheet is the VID of the Input Voltage, not the VID of the Vcore.
(Could very well be since i heard that people have had different input voltage's on same model of cpu, indicating intel probably has a Voltage Identification Table also programmed for the Input Voltage.)

Also its possible for CPU-Z to display the real Vcore instead of the VID, has to be done in either a .cfg or .ini file.
(Should come up in a simple google search)
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post #20 of 20
Thread Starter 
Quote:
Originally Posted by brucethemoose View Post

This ^^. Raise current and power limits wherever you see them in the BIOS, otherwise your CPU will throttle like crazy.
This ^^
Turbo Boost Power Max at 80W and Turbo Boost Short Power Max at 100W did the trick, no more power throttling! biggrin.gif
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