your Broadwell-E average clock

[abui1806]

Hi,
I am interested in buying a Broadwell-E for an ITX project atm and was just wondering about its overclocking ability.
What sort of voltage does your cpu require to pass cinebench R15 at 4.3Ghz and 4.5Ghz?
Including 6800K, 6900K, 6950X.
Thanks a lot!

 

[abui1806]

Thanks a lot for your informative comment Panos. I am definitely going to check the thread for more detail.
It seems like later batches of Haswell-E might got the upper hand in overclocking.
Well I'm not sure they are going to make any ITX board for Skylake-X so for now I'm just looking for a good clocker and hoping the performance leap won't be much

 

[abui1806]

My 6850K can do 4.2Ghz at approx 1.22v. I only have the NH-U12S (dual fan config) on it which is not built for heavy overclocking above 140w. I'm sure the chip could go further if it was watercooled but trying 4.3Ghz requires too much voltage (hence heat) for the cooler to handle. I ran AI Suite and it came back with a result of 4.5 Ghz @ 1.47v - No way i'm running that 24/7 even if i had the cooling.

I will be using the EK Predator 240 hopefully it can tame the beast at least up to 1.35v

Currently they dont seem to clock as well as the latter batches of older 2011 cpu's, J batch being the ones of note. Which took a while now tbh. So this will probably happen too as the manufacturing process matures.

Yes, currently there is no L batch Broadwell-E, maybe L batch 6950X is the next big thing?

After writing the above, made the decision and grabbed a second hand 4930K. Had in the OCUK basket a 5820K last night, but nah. Decided to buy a GTX1080 from OCUK with the holiday fund (contract renewed so no holidays), and keep the rest of the money that was going for the Titan X (Pascal) for a good gsync monitor.

I'm still waiting for AMD flagship since I already stuck with the MG279Q with Freesync

 

[abui1806]

My 6800k is 4.4 capable under water just about with a 240 rad and a lot of volts.

It's at stock atm tbh since the gpu is the limiting factor at 4k.

Don't do what I did and buy fast ram thinking the IMC should be almost up to skylake level. 3400 is possible for me but only at lower clock speed than stock. 3200 should be doable without affecting the OC.

cheers for the info. I'm looking at the Avexir Raiden 2x8GB 2666Mhz with the intention to run it at 3000-3200Mhz so that wouldn't be a problem.
I have an 5820K which can do one hour of Asus realbench stress test at 4.5Ghz with 1.195v but so itchy to get Broadwell-E that's all.
BTW, is it worth to get the 5960x for £800 which can do cinbench R15 at 4.7Ghz with 1.192v?

 

[abui1806]

Two sets though I take it? You'd want quad channel.

Only 1, the asrock x99e ITX only has 2 slots.

 

[abui1806]

That's a lot of volts for 4.7.

Woop it should be 1.192v

 

[abui1806]

The thing is the J batch CPUs havent really increased the max headroom for overcocking on Haswell-E they still all seem to have the same hard wall of 4.5-4.6

J batches only do it at much lower voltage compared to the initial early batches

well getting the voltage lower is essentially increase overclocking headroom in this case. Early units can barely stable at 4.4-4.5Ghz and now 4.6Ghz-4.7Ghz is pretty much the goal. I remember reading reviews of Haswell-E SKUs, they benched them at 4.4Ghz with over 1.3v now they are benchable at 4.7Ghz with 1.25-1.35v pretty easily

 

[abui1806]

Any links for these BE 4.7 chips using less than 1.35v please?

1. this 5960x isn't mine (yet) but it is pretty solid at 4.8Ghz 1.282v core, 4.6Ghz cache and 3200 ram.
http://abload.de/image.php?img=2000-01-02_173715jvskz.jpg

2. This 5960x I binned 2 months ago. 4.5Ghz 1.201v, Cinebench R15 at 4.7Ghz 1.25v but it don't have a screenshot.
http://i685.photobucket.com/albums/vv212/vozervanh/4.5Ghz 1.207v llc5.png

3. This is my current chip rocking stable for my need at 4.5Ghz 1.195v. I will try 4.7Ghz and let you know later on.
http://i685.photobucket.com/albums/vv212/vozervanh/4.5Ghz 1.207v llc5.png

 

[abui1806]

Sorry thought you referring to Broadwell

yeah sorry my bad