How to overclock Intel i7-5820k
Last year we have upgraded our computers in our workstation offices in North London – Palmers Green.
We have gone for following components:
- CPU: Intel Core i7-5820K, 3300 MHz (4700 MHz OC)
- CPU Cooler: Kraken X61
- Memory: G Skill F4-3000C15-4GRR 16GB
- Motherboard: Asus X99-S (1 PCI-E x4, 5 PCI-E x16, 8 DDR4 DIMM, 1 M.2, Gigabit LAN, Audio)
- PSU: 850W EVGA SuperNOVA G2
- Graphic Card: NVIDIA Ge Force GTX970
- Sound Card: Creative Recon 3D
- Primary HDD: SAMSUNG SM951 MZHPV256HDGL-00000 (256 GB, PCI-E 3.0 x4)
- Secondary HDD: 3 x WD Green WD30EZRX (3 TB, SATA-III)
- Monitors: Dual HP Z30i IPS Display
- PC Case: Define R5
Since we don’t play any games, we thought this setup should be sufficient for our daily tasks. We run Windows 10 PRO, dual boot with Hardened Gentoo x64 and few Virtual machines (all with Debian).
Ok, so you are now know our configuration, let’s get going with overclocking, we wanted to achieve at least 30% but end up with even more – 42%
Remove all Asus OC software as we are going to do manual overclock in BIOS. Please make sure you have the latest BIOS.
Also make sure your CPU cooler is sufficient enough to handle this beast.
Let’s enter the BIOS and go to:
Set OC Tuner to XMP and CPU Strap to 100MHz.
Set BCLK Frequency to 100 – increasing this will also increase memory frequency (Memory speed= BCLK * Memory multiplier). We have tried playing with this setup increasing BCLK, but we could not get stable overclock at 4500MHz+
Leave anything else in this section on Auto as Asus motherboard will take care of anything else.
Scroll down in this section and make sure all voltage below are set to AUTO, there is no need to adjust them as our motherboard will set them up automatically and won’t go over the limits.
One of the most important step in CPU overclocking, here we adjust CPU Multiplier (CPU Speed= BCLK * CPU Multiplier)
Select Sync all cores from CPU Core ratio option.
On Intel i7 5820k you can easily set this up at 40 at the beginning and start increasing it once you test stability of your OC.
Most important step, setting Core Voltage of our CPU.
Set CPU Core Voltage to Adaptive Mode
Offset Mode Sign to +
CPU Core Voltage Offset to Auto
Leave all other settings on AUTO as they will be set up automatically.
If you see CPU Input Voltage going above 1.950, then set it up manually at this value, or leave AUTO if it stays below.
Now under Additional Turbo Mode CPU Core Voltage set at 1.290 at the beginning. Keep this value under 1.300 for 24/7 OC profile.
Here we start to play and try to find the right balance between CPU multiplier, Vcore and CPU temps.
Install Intel Extreme Tuning Utility for a quick benchmark.
Set Vcore on value in step 4 and start increasing multiplier.
Set CPU multiplier to 41, boot to Windows, run stability test with Intell XTU. This software will usually detect invalid settings right away, resulting in BSOD or restart.
If you passed OC Test, boot back to BIOS, increase CPU multiplier and repeat the process.
When you get Blue Screen, decrease CPU multiplier to last good settings.
Once you found your “magic” CPU multiplier number, go back to Step 4 and start decreasing Additional Turbo Mode CPU Core Voltage by 0.005
Repeat the test with Intel XTU and keep decreasing Vcore until you find your “magic” value.
Once you find your “magic” numbers it’s time to do full stress test.
Run Intel XTU and setup stress test for at least 5 hours. Use RealTemp to monitor your Core temperature. Keep Core temperature under 85C.
Every chip is different, overclocking results may vary, but if your chip is capable of 4500MHz under 1.300v Vcore then you are lucky.
We have been extremely lucky with ours achieving 4700Mhz at v1.285
Below are few screenshots from CPU-Z and RealTemp (idle and stress).
i7 5820k overclocked to 4700MHz with Vcore 1.285
i7 5820k 4700MHz CPU temperature idle
i7 5820k 4700MHz CPU temperature full load
Good luck with your overclocking, let us know your results in comments below.
Damn, that’s a great chip. Well done. I got mine at 4400MHz vcore 1.3
Asus x99 Deluxe
32gb 4×8 3200mhz DDR4 Corsair dominator.
5820k with noctua 15mm heatsinker NH-D15 double turret and 2x140mm 1200rpm fan.
1.295v , strap 100, x45 ratio
It stay stable at 4.5 GHz
34-39°c on idle
60-65°c on full load with fan at 60% speed, 54°c with 100% fan speed
Case with 3x120mm in and 3x120mm out, all with filter.
Corsair 750w PSU
No watercooled (i hate It).
I got it to 4.5Ghz vcore 1.3 – temp at 100% was around 67-70C with Nepton 140XL
The big question for many enthusiasts contemplating the X99 upgrade is, how well does Haswell-E overclock compared to previous gen processors? We’ll be answering this question together with how to overclock the processor in this guide.
When I Enable XMP, CPU strap change to 125Mhz !
Should I change it back to 100Mhz ?
plz I need your help.. I really got confused with XMP enabled 🙁
and should I change ram voltage ?
M/B: ASUS X99-DELUXE/U3.1
RAM: G.SKILL Ripjaws 4 Series 16GB 3000MHz
Yes, change it back to 100Mhz, there is no need to touch memory voltage.
Thank u 4 the fast reply.
Ok, I will try that.
Because every one keep telling me that if I want to use RAM speed above 2666Mhz I have to change BCLK and STRAP from 100Mhz to 125Mhz (It’ll change automatically), or the system will not be stable !
I couldn’t overclock on 100Mhz BCLK and Strap with XMP enabled (3000Mhz speed ram), overclock failed even on booting.
So, My pc now pass all stability tests at 4.5Mhz, 1.275v, XMP enabled 3000MHz, BCLK ans Strap 125MHz.
that all what I changed and its going well.
I really want to know what I have to do with Min and Max CPU Cache Ratio ? (when I enabled XMP, automatically Min and Max CPU Cache Ratio changed to 25 ), should I increase the Max cpu cache ratio ?
Sorry, I meant 100Mhz BCLK and Strap with XMP enabled (2800Mhz speed ram)**
5820k X99eWS at 4.52Ghz x36 and 125.5 strap 2667MHz DDR4 (Kingston Fury). 1.305V CPU Voltage. Scores 1308cb in cinebench. 40 degrees idle, 67 degrees full load. Watercooled.
CPU Speed – 4750Mhz
Core Voltage – 1.287v
CPU Strap – 125Mhz
CPU Core Ratio – 38
BCLK Freq – 125Mhz
XMP – Enabled
Target DRAM Freq – 3000Mhz
RealTemp Max Temp – 66C-73C
RealTemp Max Idle Temp – 34C-38C
VRM Max Temp – 52C
VRM Idle Temp – 44C
*All other settings left stock
Asus X99-A II
32GB G.Skill Ripjaws V Series DDR4-3333
Samsung 850 Pro SSD
Gigabyte 6850 HD Video Card
Thermaltake Smart DPS G 750W Power Supply
Thermaltake Core P5 Case
EK-FB X99 Monoblock
Thermaltake RL480 Radiator (4 Fans)
Why has the poster on this thread never replied on how he had obtained to have bclk set 100 on a x99 when every where on the net it is stated that is impossible without the bclk bumping from 100 to 125. This must be a troll.
When you activate XMP the FSB Strap goes autom. from 100 to 125.
With 100 ist DDR4-2666 the maximum on the X99 Board. Otherwise the system doesn´t start.
With 125 and DDR4-3000 it works.
Here my config
FSB 125 (automatic)
CPU Ratio 35
VCore 1,185 V
DRAM Votage 1,350 V
VCCIO CPU 1,050 V
VCCIO PCH 1,050 V
CPU Cache Voltage 1,10 V
VCCIN 1,850 V
Old but not dead 🙂
The i7-5820k Haswell is a nice OC CPU.
CPU Speed – 4400Mhz
Core Voltage – 1.150v
FSB Strap – 100Mhz
CPU Core Ratio – 44
XMP – Disabled -> manual setting
Target DRAM Freq – DDR4-3200Mhz
DRAM Voltage 1.35v
CPU Cache Voltage – 1.10v
VCCin – 1.85v
CoreTemp Max Idle Temp – 33c-38c
CoreTemp Max Temp – 67c-74c
Cooled with Noctua NH-D15s
Prime95 stable with 1344k Test.