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i5 4670k overclocking voltage

Madexo
By Madexo
in CPUs, Motherboards, and Memory
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Go to solution Solved by Jurrunio,

1.4V will be the max I'd try on ambient cooling.

 

What is bad for your CPU is the current draw. You can't monitor current draw directly, but voltage plays a big role on current draw so that's why people use the term "safe voltage" instead of "safe current". The max rated current for 84w Haswell parts (including the 4670k) is 95A, so if you really want to try your luck without breaking the CPU, set the CPU core current limit to 95A and start pushing voltage. It will throttle you if your current draw exceeds that limit.

Posted

Hi,
 

My i5 4670k is overclocked to a stable 4.4GHz, and it's currently at 1.28 V (CPU-Z shows 1.290V)
 

I'm wondering to what voltage you can go before it gets dangerous/bad for the chip. (My BIOS shows a red number after 1.30V)

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43 minutes ago, Madexo said:

Hi,
 

My i5 4670k is overclocked to a stable 4.4GHz, and it's currently at 1.28 V (CPU-Z shows 1.290V)
 

I'm wondering to what voltage you can go before it gets dangerous/bad for the chip. (My BIOS shows a red number after 1.30V)

1.42V as long as temps are under 80C. Can go to 1.45V if temps are under 70C though.

8700K @ 5.2ghz 1.29V, 4x8 Rev.E @ 4040 13-20-20-39 1.7V.

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1.4V will be the max I'd try on ambient cooling.

 

What is bad for your CPU is the current draw. You can't monitor current draw directly, but voltage plays a big role on current draw so that's why people use the term "safe voltage" instead of "safe current". The max rated current for 84w Haswell parts (including the 4670k) is 95A, so if you really want to try your luck without breaking the CPU, set the CPU core current limit to 95A and start pushing voltage. It will throttle you if your current draw exceeds that limit.

CPU: i7-2600K 4751MHz 1.44V (software) --> 1.47V at the back of the socket Motherboard: Asrock Z77 Extreme4 (BCLK: 103.3MHz) CPU Cooler: Noctua NH-D15 RAM: Adata XPG 2x8GB DDR3 (XMP: 2133MHz 10-11-11-30 CR2, custom: 2203MHz 10-11-10-26 CR1 tRFC:230 tREFI:14000) GPU: Asus GTX 1070 Dual (Super Jetstream vbios, +70(2025-2088MHz)/+400(8.8Gbps)) SSD: Samsung 840 Pro 256GB (main boot drive), Transcend SSD370 128GB PSU: Seasonic X-660 80+ Gold Case: Antec P110 Silent, 5 intakes 1 exhaust Monitor: AOC G2460PF 1080p 144Hz (150Hz max w/ DP, 121Hz max w/ HDMI) TN panel Keyboard: Logitech G610 Orion (Cherry MX Blue) with SteelSeries Apex M260 keycaps Mouse: BenQ Zowie FK1

 

Model: HP Omen 17 17-an110ca CPU: i7-8750H (0.125V core & cache, 50mV SA undervolt) GPU: GTX 1060 6GB Mobile (+80/+450, 1650MHz~1750MHz 0.78V~0.85V) RAM: 8+8GB DDR4-2400 18-17-17-39 2T Storage: HP EX920 1TB PCIe x4 M.2 SSD + Crucial MX500 1TB 2.5" SATA SSD, 128GB Toshiba PCIe x2 M.2 SSD (KBG30ZMV128G) gone cooking externally, 1TB Seagate 7200RPM 2.5" HDD (ST1000LM049-2GH172) left outside Monitor: 1080p 126Hz IPS G-sync

 

Desktop benching:

Cinebench R15 Single thread:168 Multi-thread: 833 

SuperPi (v1.5 from Techpowerup, PI value output) 16K: 0.100s 1M: 8.255s 32M: 7m 45.93s

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12 hours ago, Jurrunio said:

1.4V will be the max I'd try on ambient cooling.

 

What is bad for your CPU is the current draw. You can't monitor current draw directly, but voltage plays a big role on current draw so that's why people use the term "safe voltage" instead of "safe current". The max rated current for 84w Haswell parts (including the 4670k) is 95A, so if you really want to try your luck without breaking the CPU, set the CPU core current limit to 95A and start pushing voltage. It will throttle you if your current draw exceeds that limit.

Don't see the option to set core current limit in the BIOS, or am i looking in the wrong place?

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1 hour ago, Madexo said:

Don't see the option to set core current limit in the BIOS, or am i looking in the wrong place?

not all boards have it on Haswell when the voltage regulator is inside the CPU. In this case just limit your voltage then

CPU: i7-2600K 4751MHz 1.44V (software) --> 1.47V at the back of the socket Motherboard: Asrock Z77 Extreme4 (BCLK: 103.3MHz) CPU Cooler: Noctua NH-D15 RAM: Adata XPG 2x8GB DDR3 (XMP: 2133MHz 10-11-11-30 CR2, custom: 2203MHz 10-11-10-26 CR1 tRFC:230 tREFI:14000) GPU: Asus GTX 1070 Dual (Super Jetstream vbios, +70(2025-2088MHz)/+400(8.8Gbps)) SSD: Samsung 840 Pro 256GB (main boot drive), Transcend SSD370 128GB PSU: Seasonic X-660 80+ Gold Case: Antec P110 Silent, 5 intakes 1 exhaust Monitor: AOC G2460PF 1080p 144Hz (150Hz max w/ DP, 121Hz max w/ HDMI) TN panel Keyboard: Logitech G610 Orion (Cherry MX Blue) with SteelSeries Apex M260 keycaps Mouse: BenQ Zowie FK1

 

Model: HP Omen 17 17-an110ca CPU: i7-8750H (0.125V core & cache, 50mV SA undervolt) GPU: GTX 1060 6GB Mobile (+80/+450, 1650MHz~1750MHz 0.78V~0.85V) RAM: 8+8GB DDR4-2400 18-17-17-39 2T Storage: HP EX920 1TB PCIe x4 M.2 SSD + Crucial MX500 1TB 2.5" SATA SSD, 128GB Toshiba PCIe x2 M.2 SSD (KBG30ZMV128G) gone cooking externally, 1TB Seagate 7200RPM 2.5" HDD (ST1000LM049-2GH172) left outside Monitor: 1080p 126Hz IPS G-sync

 

Desktop benching:

Cinebench R15 Single thread:168 Multi-thread: 833 

SuperPi (v1.5 from Techpowerup, PI value output) 16K: 0.100s 1M: 8.255s 32M: 7m 45.93s

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