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Madexo

i5 4670k overclocking voltage

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.

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Posted · Original PosterOP

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.

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Posted · Best Answer

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.


Studying abroad, ditched the crappy laptop for a do-all laptop double. Dried factory CPU paste, long memory timings, cooler cools the inductors but not the mosfets and an inch of unused internal space on both left and right

Model: HP Omen 17 17-an110ca CPU: i7-8750H (0.125V core & cache, 50mV system agent undervolt) GPU: GTX 1060 6GB Mobile (1696MHz 0.812V ~ 1860MHz 0.95V) RAM: 12GB DDR4-2666 19-19-19-43 2T Storage: 128GB Toshiba NVMe SSD (KBG30ZMV128G) + 1TB Seagate 7200RPM 2.5" HDD (ST1000LM049-2GH172) Monitor: 1080p 120Hz IPS G-sync

 

The best thing to do is reading the clock speed that doesnt end in a pair of zeros. Software voltage readings are wrong if your motherboard's not a high end model

CPU: i7-2600K 4493MHz (multiplier: 43x) 1.35V (software) --> 1.4V at the back of the socket Motherboard: Asrock Z77 Extreme4 (BCLK: 104.5MHz) CPU Cooler: Noctua NH-D15 RAM: Adata XPG 2x8GB DDR3 (XMP: 10-11-11-30 2T 2133MHz, custom: 10-11-10-30 1T 2229MHz) GPU: Asus GTX 1070 Dual 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 (OC'd 150Hz) TN Keyboard: Logitech G610 Orion (Cherry MX Blue) with SteelSeries Apex M260 keycaps Mouse: BenQ Zowie FK1

 

Results: Cinebench R15 Single thread:159 Multi-thread: 770 (thx Meltdown Spectre patch) Super Pi (v1.5 from Techpowerup, PI value output) 16K: 0.11s 1M: 8.4s 32M: 7m 45.9s

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Posted · Original PosterOP
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


Studying abroad, ditched the crappy laptop for a do-all laptop double. Dried factory CPU paste, long memory timings, cooler cools the inductors but not the mosfets and an inch of unused internal space on both left and right

Model: HP Omen 17 17-an110ca CPU: i7-8750H (0.125V core & cache, 50mV system agent undervolt) GPU: GTX 1060 6GB Mobile (1696MHz 0.812V ~ 1860MHz 0.95V) RAM: 12GB DDR4-2666 19-19-19-43 2T Storage: 128GB Toshiba NVMe SSD (KBG30ZMV128G) + 1TB Seagate 7200RPM 2.5" HDD (ST1000LM049-2GH172) Monitor: 1080p 120Hz IPS G-sync

 

The best thing to do is reading the clock speed that doesnt end in a pair of zeros. Software voltage readings are wrong if your motherboard's not a high end model

CPU: i7-2600K 4493MHz (multiplier: 43x) 1.35V (software) --> 1.4V at the back of the socket Motherboard: Asrock Z77 Extreme4 (BCLK: 104.5MHz) CPU Cooler: Noctua NH-D15 RAM: Adata XPG 2x8GB DDR3 (XMP: 10-11-11-30 2T 2133MHz, custom: 10-11-10-30 1T 2229MHz) GPU: Asus GTX 1070 Dual 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 (OC'd 150Hz) TN Keyboard: Logitech G610 Orion (Cherry MX Blue) with SteelSeries Apex M260 keycaps Mouse: BenQ Zowie FK1

 

Results: Cinebench R15 Single thread:159 Multi-thread: 770 (thx Meltdown Spectre patch) Super Pi (v1.5 from Techpowerup, PI value output) 16K: 0.11s 1M: 8.4s 32M: 7m 45.9s

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