Haswell Owners overclocks thread

hakank68

hakank68

hakank68

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Hello, i was curious how much people can overclock their haswell chips, i have recently built a pc and will be watercooling it today then a bit of overclocking. I would appreciate if anyone can post their overclocks and voltaages as this is the first time i will be overclocking

Post your Overclocks, Voltages and the Coolers you use ! :D

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My 4670k does 4.8Ghz but needs silly volts (1.45v) so day to day runs at 4.5Ghz with 1.285v vcore, cpu cache also at 4.5Ghz with cache voltage at 1.3v. Cpu input voltage is set at 1.9v. Cooling is custom water with dual 360mm rads mounted in a box on a windowsill. Current water temp is 8.5 degrees!! :D
 
Bench settings:

4770k, 5.1ghz @ 1.4v, 4.7ghz uncore, ddr2400 c8. Load temps around 70-75c

24/7:

4770k, 4.8ghz @ 1.31v, 4.3ghz uncore, ddr2400 c10. Load temps around 60-65c

All custom water.
 
4670k at 4.6GHZ @ 1.295V. DDR3 1600 C9. Cooled with a corsair H100i.

4670k at 4.4ghz @ 1.2V. Same memory, Cooled with an Akasa Nero V3.

I can't remember Vring but I can check and edit if you care.

Same CPU, different coolers. Uncore 3.7ghz on both, as it provides no measurable benefit in any real world use.
 
Make said:
4670k at 4.6GHZ @ 1.295V. DDR3 1600 C9. Cooled with a corsair H100i.

4670k at 4.4ghz @ 1.2V. Same memory, Cooled with an Akasa Nero V3.

I can't remember Vring but I can check and edit if you care.

Same CPU, different coolers. Uncore 3.7ghz on both, as it provides no measurable benefit in any real world use.
Click to expand...

What's your temps on the h100i? They're some impressive overclocks on a AIO
 
hakank68 said:
What's your temps on the h100i? They're some impressive overclocks on a AIO
Click to expand...

I'll do a bit of stress-testing when I get home, but from memory I get low 80's in prime, and low 60's in heavy-CPU games like Star citizen alpha.. Normal gaming, like mechwarrior online I get temps in the 50's.

But anyway i'll test it for you when I get home. Watch this space.
 
4770K: 4.5ghz takes 1.245v, 4.6 takes 1.295v. Both on h100i.

Temps are high 60s in Intel XTU stress test, iirc.

I might try putting some more volts though it later today; see what I can get.
 
pgi947 said:
Bench settings:

4770k, 5.1ghz @ 1.4v, 4.7ghz uncore, ddr2400 c8. Load temps around 70-75c

24/7:

4770k, 4.8ghz @ 1.31v, 4.3ghz uncore, ddr2400 c10. Load temps around 60-65c

All custom water.
Click to expand...

I've been trying to work out what to do with uncore for a while, and this is the first I've seen it mentioned. I've got Overclock sitting mild at 4.2ghz, 1.16v, 3.6ghz uncore. Cooling is H100i and temps are mild, under 60 degrees full load usually. It's stable, but when I try to go higher than 4.2ghz I seem to run into trouble. It's a 4670k by the way.

What's your advice re: uncore, if any?
 
Afaik uncore improves efficiency especially with memory, not a deal breaker by any means but useful in benching (I'm sure 8 pack can give a far better explanation of it though!).

General rule of thumb is as close to your cpu clock speed as possible, usually within 3-400mhz. Though I think uncore runs from ring vcore, which can drive temps up so find a nice balance.
 
String said:
I've been trying to work out what to do with uncore for a while, and this is the first I've seen it mentioned. I've got Overclock sitting mild at 4.2ghz, 1.16v, 3.6ghz uncore. Cooling is H100i and temps are mild, under 60 degrees full load usually. It's stable, but when I try to go higher than 4.2ghz I seem to run into trouble. It's a 4670k by the way.

What's your advice re: uncore, if any?
Click to expand...

Someone did a test in another forum where an uncore between 3.6ghz and 4.4ghz made no difference in games. I recall there was no difference in heaven score either. Perhaps a little in Cinebench. Though my 4670k in the cinebench thread scores the same as those @ same frequency but higher uncore. Sadly I cannot find the link right now.

Core clock is the king, uncore unstabilizes OC :)

Haswell uncore runs double the speed than sandy/ivy, therefore no overclock on it is needed as it's "way too fast" even at stock.

Meanwhile, doing some temp tests now.
 
hakank68 said:
What's your temps on the h100i? They're some impressive overclocks on a AIO
Click to expand...

Right, I did some testing now. Quick runs, but case airflow is great so unless my flat heats up a lot, which is unlikely in the winter, the temps will be the same. here you go:

- 36c max idle / browsing the internet. I don't care about "true" idle as you don't use the PC then..
- 3dmark 11 goes up to 52C on "package", cores vary between 47c and 52c.
- Prime95 blend test, package goes up to 65c, cores vary between 59x and 65c.
- Prime95 small FFT's torture test goes up to 84c, cores vary a bit less on this. I ran this for 20 minutes.

Gaming temps are usually lower than prime Blend, so less than 60.

Vcore voltage 1.295
Vring voltage 1.114

That's with my H100i on silent, case fans on lowest possible setting (fan controller turned down). That's 2 case sidefans blowing into the case, one at the bottom, one at the front, and exhausting out the back and top through h100i. GFX card is a blower-style, so it does not affect CPU temps at all.

Can thoroughly recommend the H100i. If you tune in your overclock with the other voltages, you don't need to vcore your CPU to death.
 
Tweaking the uncore/cpu cache is what got me the top i5 score in the cinebench thread. Not too far off the overall highest single core score either.
 
i7 4770k @4.5ghz, 1.262500 vcore, load temps in p95 max at 94c.

Ram, 8gb team group vulcan red, 2400mhz, 10, 11, 11, 31, 2T

Havent touched the uncore yet though. Cooler is an alpenfohn k2 with x2 akasa piranha 120mm pwm fans. Chip is an extremely hot runner when stressed with p95 small fft. Temps in games though are good at 65c in a case with extremely poor airflow. Ive reseated the cooler using liquid ultra paste a few times now but no change in temps. Thought about delidding it and pushing higher. But for my uses it'll do in the meantime.
 
My first day of haswell overclocking

Gigabyte Z87X-OC

Using default voltage on mobo (which seems to be somehwat high at 1.428V), get a 4.5 clock speed, but temps on prime 95 did hit 100C once (usually running in the 65C-80C range), which worries me as I'm using a OcUK 480 rad kit.

Had a blue screen at 4.6 running prime.

Not changed anything in bios except multiplier so far so maybe I have more headroom to play with.
 
frontfoot said:
I think my mobo (gigabyte z87x-OC) auto overvolts it. Without touching any bios settings the first time I booted up it had vcore at 1.428 and CPU clocked at 4.2
Click to expand...

Maximum recommended vcore for Haswell is 1.35 and I wouldn't have mine anywhere near there on air. If you look at advanced voltage settings in BIOS, vcore will be set at auto but you will see what the BIOS has it set at (number next to auto).

Also, your CPU shouldn't be at 4.2ghz stock frequency.
 
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