Thursday, May 14th 2015

Intel Core i7-5775C "Broadwell" Scrapes 5 GHz OC on Air

Intel's parting gifts to the LGA1150 platform, the Core i5-5675C and the Core i7-5775C, are shaping up to be a pleasant surprise to overclockers. Built on the 14 nm "Broadwell" silicon, the two quad-core chips come with extremely low rated TDP of 65W, for products of its segment. We weren't sure of those energy savings somehow translated into a massive overclocking headroom. It turns out, there's hope. Toying with a Core i7-5775C chip on an ASRock Z97 OC Formula, Hong Kong-based HKEPC found that the chip was able to reach 5.00 GHz clock speeds with ease on air-cooling, and a core voltage of 1.419V. At 4.80 GHz, the i7-5775C crunches 32M wPrime in 4.399 seconds.
Sources: HKEPC, Expreview
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70 Comments on Intel Core i7-5775C "Broadwell" Scrapes 5 GHz OC on Air

#1
DeNeDe
that sounds great..
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#2
Jetster
Was that on all four cores?
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#3
Folterknecht
14nm chip and 1.42V that doesn't sound like a 24/7 setting to me that s still healthy for the chip.
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#4
qubit
Overclocked quantum bit
However, good Broadwell is, it's a short-lived transition architecture until Skylake which will be even better, so I'll continue to wait for that to come out.
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#5
buggalugs
Folterknecht, post: 3281566, member: 36292"
14nm chip and 1.42V that doesn't sound like a 24/7 setting to me that s still healthy for the chip.
Completely agree. Even at 4.8 its using over 1,4 volts.
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#6
Caring1
Jetster, post: 3281553, member: 80410"
Was that on all four cores?
The CPU selection on CPU-Z is greyed out showing CPU1, so i'd say single core only, but can't be certain just from that screenshot.
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#7
GreiverBlade
qubit, post: 3281573, member: 46003"
However, good Broadwell is, it's a short-lived transition architecture until Skylake which will be even better, so I'll continue to wait for that to come out.
well even Skylake will be a meager update over a Haswell setup (std or DC) they talk about what percentage increase? 10%? well the 14nm node and TDP reduced (IF 95w minus IGP is lower than 88w minus IGP, if not ... then i would be disappointed :roll: but it will not be the case.)

(tho for you it's a upgrade :ohwell:)
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#8
ZeDestructor
Jetster, post: 3281553, member: 80410"
Was that on all four cores?
Ahh, asking all the important questions.. looks like it.

Caring1, post: 3281576, member: 153156"
The CPU selection on CPU-Z is greyed out showing CPU1, so i'd say single core only, but can't be certain just from that screenshot.
CPU-Z CPU selection got updated a while back when the first multi-core CPUs came around to seperate clearly between cores, threads and sockets. Sockets go CPU1, CPU2, etc, with cores and threads shown on the right of that.

Folterknecht, post: 3281566, member: 36292"
14nm chip and 1.42V that doesn't sound like a 24/7 setting to me that s still healthy for the chip.
True, but you're shortening from 10 years to maybe 5 years... like we really care on a gaming machine...

qubit, post: 3281573, member: 46003"
However, good Broadwell is, it's a short-lived transition architecture until Skylake which will be even better, so I'll continue to wait for that to come out.
Indeed...
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#9
TheDeeGee
ZeDestructor, post: 3281582, member: 151464"
Ahh, asking all the important questions.. looks like it.


CPU-Z CPU selection got updated a while back when the first multi-core CPUs came around to seperate clearly between cores, threads and sockets. Sockets go CPU1, CPU2, etc, with cores and threads shown on the right of that.



True, but you're shortening from 10 years to maybe 5 years... like we really care on a gaming machine...



Indeed...
My 4770K currently does 4,5 GHz @ 1.175 volts.
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#10
erixx
TheDeeGee, post: 3281593, member: 108032"
My 4770K currently does 4,5 GHz @ 1.175 volts.
My 4970K does 4,4 Ghz at 1.175v (adaptive, during stresstest).
And then performance increase: will there be going to 5K GHZ?
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#11
BorisDG
buggalugs, post: 3281575, member: 56431"
Completely agree. Even at 4.8 its using over 1,4 volts.
At 4.8 you can't see the voltage. 1.4V is for 5GHz.
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#12
BigMack70
ZeDestructor, post: 3281582, member: 151464"
True, but you're shortening from 10 years to maybe 5 years... like we really care on a gaming machine...
This is how I feel also. I got a 2600k back at the start of 2012 and it's a little bit of a dud clocker... needs 1.52V for 5 GHz and it's been running a that setting for over 3 years now with no issues.

Anyways, I just can't get excited about Broadwell with Skylake so close around the corner. Hopefully Skylake will be able to do 5 GHz also... it's likely to be faster at stock than my 2600k @ 5 GHz and that's always been my criteria for an upgrade!
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#13
Captain_Tom
BigMack70, post: 3281668, member: 104111"
This is how I feel also. I got a 2600k back at the start of 2012 and it's a little bit of a dud clocker... needs 1.52V for 5 GHz and it's been running a that setting for over 3 years now with no issues.

Anyways, I just can't get excited about Broadwell with Skylake so close around the corner. Hopefully Skylake will be able to do 5 GHz also... it's likely to be faster at stock than my 2600k @ 5 GHz and that's always been my criteria for an upgrade!
No offense but that is the silliest rule for an upgrade lol. At best you will get a 20% performance boost for what? $500?!

I won't be upgrading my i7-4770K until I can get a cpu that is AT LEAST 2-3 times stronger.
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#15
BigMack70
Captain_Tom, post: 3281676, member: 155434"
I won't be upgrading my i7-4770K until I can get a cpu that is AT LEAST 2-3 times stronger.
Have fun waiting 10+ years for that... current pace of CPU performance increases is to take 10 years+ o get 100-200% performance improvement per core.

I'd prefer not to wait a decade for my next CPU upgrade, so I just wait until I can get something noticeably better than what I have.
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#16
Moofachuka
I'm still rocking my i7 980 @ 4.2GHZ and I'm not thinking of upgrading it anytime soon. Not even Skylake.
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#17
pikunsia
Captain_Tom, post: 3281676, member: 155434"
No offense but that is the silliest rule for an upgrade lol. At best you will get a 20% performance boost for what? $500?!

I won't be upgrading my i7-4770K until I can get a cpu that is AT LEAST 2-3 times stronger.
A wise decision IMO; Skylake (14nm or 10nm) should be the way to go, we need to buy a new mobo (LGA 1151) though.
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#18
pikunsia
Hey pals, did you realize that these CPUs come with a 6MB L3 cache and not 8MB? It is also strange that with this Tic (22nm to 14nm) one needs a VCORE>1,4v. My i7-4790k running @ 4.85GHz just needs 1.35v (ASUS Z97 Pro and a Corsair Hydro H105). In general an i7-4790k @ 4.9-5.2 GHZ needs a custom watercooling.
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#19
GhostRyder
Pretty impressive, though some of the high end air coolers I believe could handle levels beyond that already so it depends on what air cooler he is referencing and seeing it its a pretty massive one.

I am interested in seeing these chips on the market, they are going to be great chips at those levels (Referencing TDP and overclocking)!!!

1.4 volts+ does seem though a bit high for me personally on a chip like that.
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#20
BigMack70
pikunsia, post: 3281716, member: 152298"
Hey pals, did you realize that these CPUs come with a 6MB L3 cache and not 8MB? It is also strange that with this Tic (22nm to 14nm) one needs a VCORE>1,4v. My i7-4790k running @ 4.85GHz just needs 1.35v (ASUS Z97 Pro and a Corsair Hydro H105). In general an i7-4790k @ 4.9-5.2 GHZ needs a custom watercooling.
How much vcore you need for a given clock speed is more dependent on silicon lottery than manufacturing process node.
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#21
buildzoid
So this looks like intels manufacturing consistency has dropped even further. Which isn't all that surprising since 14nm is absolutely tiny. Also 1.4V will most likely cause significant degradation so that OC will be stable for a year or maybe a couple months and then need a bump in voltage.
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#22
cadaveca
My name is Dave
buildzoid, post: 3281737, member: 111437"
So this looks like intels manufacturing consistency has dropped even further. Which isn't all that surprising since 14nm is absolutely tiny. Also 1.4V will most likely cause significant degradation so that OC will be stable for a year or maybe a couple months and then need a bump in voltage.
CPU vCore is not the main voltage supplied to the chip, and without vInput, the amount of vCore used is rather irrelevant. Just sayin'.

Also, isn't this chip just an optical shrink of Haswell? So then just lower power consumption for CPU cores, while iGP gets a smaller performance boost... OC not affected, and remains the same as the past generations, since it is the same compute pipeline.
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#23
jabbadap
pikunsia, post: 3281716, member: 152298"
Hey pals, did you realize that these CPUs come with a 6MB L3 cache and not 8MB? It is also strange that with this Tic (22nm to 14nm) one needs a VCORE>1,4v. My i7-4790k running @ 4.85GHz just needs 1.35v (ASUS Z97 Pro and a Corsair Hydro H105). In general an i7-4790k @ 4.9-5.2 GHZ needs a custom watercooling.
It has iris pro and embedded SRAM though. If I remember correctly it can be used as cache if you don't use igp.

ZeDestructor, post: 3281582, member: 151464"
...
CPU-Z CPU selection got updated a while back when the first multi-core CPUs came around to seperate clearly between cores, threads and sockets. Sockets go CPU1, CPU2, etc, with cores and threads shown on the right of that.
...
Yeah that's very true.
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#24
buildzoid
cadaveca, post: 3281740, member: 25138"
CPU vCore is not the main voltage supplied to the chip, and without vInput, the amount of vCore used is rather irrelevant. Just sayin'.
It's going to be within say 50mv of the voltage they set and that's still really high.
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#25
newtekie1
Semi-Retired Folder
Meh, its an ES. They made the same claims about Haswell, and Devil's Canyon and we all saw how that worked out...
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