5775C - stepping / revision ?

[honey2015]

I'm looking for 5775C and plan is to overclock it around edge of safe voltage

thats why I would like to get newer, improved, better (hope so) 5775C which can withstand little more clock.

but there is little info I can find elsewhere on Broadwell steppings, revisions, etc.

as it was launched Q2 2015 there should be newer steppings? or it is smart to wait little longer?

maybe somebody have expirience with there cpu
any advices and info are welcome, tnx

 

[DonkeyOatie]

Why? Broadwell is not especially cost/effective in a desktop (although I love my laptop i3 5015u)

 

[honey2015]

I already have all other parts, cpu and cooler remains to get

but I'm not in big hurry to finish it at this moment

 

[DonkeyOatie]

So my question was really why the 5775c Broadwell and not a Haswell CPU?

 

[honey2015]

I suppose it would be better for gaming because of L4 cache, especially overclocked. also looks like it have less problems with heat compared to Haswell. but I could be wrong.

 

[DonkeyOatie]

No, you are right, it is better, but it is also a significantly more expensive.

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i7-5775C 3.3GHz Quad-Core Processor ($403.99 @ B&H)
CPU Cooler: CRYORIG H7 49.0 CFM CPU Cooler ($34.50 @ Newegg)
Total: $438.49
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-10-08 11:44 EDT-0400

VS

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i7-4790K 4.0GHz Quad-Core Processor ($326.95 @ SuperBiiz)
CPU Cooler: CRYORIG H5 Universal 65.0 CFM CPU Cooler ($46.99 @ Newegg)
Total: $373.94
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-10-08 11:45 EDT-0400

Games are much more GPU dependent than CPU dependent. I'd want to spend the saved money on a better GPU. If you have the parts and want to spend the money, it's your choice.

For gaming an i5 4690K is very stout and even cheaper.

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-4690K 3.5GHz Quad-Core Processor ($219.99 @ SuperBiiz)
CPU Cooler: CRYORIG H5 Universal 65.0 CFM CPU Cooler ($46.99 @ Newegg)
Total: $266.98
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-10-08 11:49 EDT-0400

 

[honey2015]

that price difference isn't problem.

so, if it is better for gaming as you confirm, than lets see about original question about stepping & revision

 

[DonkeyOatie]

I don't think so. Who knows what Intel MIGHT do?

The high-end Broadwells got delayed and have run into Skylake. I just don't see any market for them. Why would Intel put money into the high-end Broadwells? Where would their return be?

Lower-end low voltage Broadwells are great for laptops. I expect the upper-end Broadwells to 'fade away'. They did have to exist in case the wheels fell of the Skylake plans.

 

[honey2015]

Understand. You mean newer steppings/revisions won't be any better?

But is there any users who has expirience with broadwell? There should be few steppings/revision until now so maybe I could be directed to overall better version

 

[honey2015]

I recived 5775C processor today.

on the processor I can see :


INTEL ® COREtm i7

i7 - 5775C

SR2AG 3.3GHZ

L511D367 (e4)


on the package I can see :

Product Code : BX80658I75775C

S/N : M5774VT21500

Batch# : L511D367

Made in Malaysia


I can't assemble PC right now because I'm waiting for one more part. So, what you think, can we "see" anything from this codes about this CPU ?

tnx

 

[DonkeyOatie]

Don't know enough yet.

 

[honey2015]

Don't know enough yet.

do I have to check any other numbers ??

 

[DonkeyOatie]

No. I need to know more about the coding.

 

[honey2015]

No. I need to know more about the coding.

any way to know about it now?

 

[DonkeyOatie]

I would need to do a lot of research that I am not going to do.

 

[honey2015]

Stepping - 1

Revision E0/G0

looking at CPU Z, it uses 1.153V at 3600Mhz, and 1.196V at 3700Mhz. it is all stock, I did not take any changes in clock and voltage.

 

[DonkeyOatie]

Thanks for the information. I just don't think they will have a future. Skylake has overtaken events and they are too expensive to be a viable APU. If they killed two cores and made an i3 APU out of them and priced it properly, they could make AMD APUs limp very badly.

 

[honey2015]

tnx you too.

after I solve problems with BIOS, we will see how much it can overclock (on Noctua NH-D15).

 

[honey2015]

testing at this moment

at stock voltage (on Turbo 3.7Ghz) of slightly less than 1.2V, it overclocked up to 4.1 and passed stress test (short). temps was around 50C

4.2Ghz proven unstable at stock voltage. it boot to Windows, but crushes after few minutes of normal usage.

I jumped to 4.3Ghz and 1.25V and it passed short stress test without problem, at maximum of 55C.

at 4.4Ghz it looks like becamed very voltage hungry, as it crushed on stress test after two minutes on 1.33V.

now I will try 1.35V

 

[honey2015]

it needs core voltage 1.38V and input voltage of 2V to run stress test without crushing. temperatures are around 65-70C, and Noctua is working with only one central fan.

 

[DonkeyOatie]

That voltage is higher than I would want to run for an extended period. When the voltage jumps a lot to get a single step, that's a sign you've hit or reached the 'voltage wall'. Thanks for the information. There aren't to many of those top end Broadwells out there.

 

[honey2015]

we can conclude for sure that 4.3Ghz is sweet spot for this (my) cpu. much lower temperatures and voltage requirement than 4.4

however, if I'm not wrongly informed, voltage less than 1.4V is not problem for Broadwell.

my RAM and PSU still didn't arrived so I tested this at poor 2Gb of DDR3 1600mhz C11 , and some shit PSU with 4pin cpu connector. with proper RAM and PSU with of course 8 pin cpu connector (both are really high quality bought) maybe it will be even more stable at little lower voltage than 1.38V


this is not golden chip but also not bad chip at all


when parts arrive I will test more, and decide for clock speed and test it 24/7

 

[DonkeyOatie]

The early Chinese 5.0Ghz on air was achieved at over 1.4V. However it is too early to assume that this is desirable or safe for the long run. This is a 14nm chip and the driving forces for accelerated degradation are Voltage, which provides the 'force' and Temperature, which facilitates the process.

I would be happy if my fears were groundless. I would not run at those voltages until there was a large body of evidence showing it was 'safe'.

 

[honey2015]

For now, it will stay on stock speed as more is not really needed. These tests are done just to check how good chip I get, because one day in future it will be overclocked due do higher demands.

I will be just checking one more time when Ram and PSU arrives to see is there any changes.

In next period, it would be good to collect more info on safe voltage limit for longer period use.

I heard that 1.45v is maximum safe limit for Skylake, claim from Intel.

They should give us safe voltage limit for Broadwell too

 

[HowNowBrownCow]

So this thread is super old, and I know many consider it bad taste to post in such old threads, but I have bought an i7-5775c and am currently putting it through the paces to find its limits.

I'm posting here because there is a serious lack of information about these chips. I know they are / were unpopular, but it's frustrating just how barren the internet is on broadwell-c information.

Currently running prime95 at 1.2v vCore and 3800 mhz. If I don't get yelled at by an admin first, I'll post more info probably tomorrow for future googlers that come across the post as I did.

honey2015, I'd be interested in seeing what you ended up getting. Oh and about your initial question, my stepping is 1, revision is E0/G0. I can't find my box right now for the batch#, it's been a few weeks since I stuck it in the PC and I may have tossed it.