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CPU turbo boost problem? ?

Hello. 

I have an i5 4670 and it can be turbo boosted to 3.8 ghz but when I start  cpu stress test it drops to 3.57 ghz. What could be the problem ? I have set in the bios  3.8 ghz to all cores and my temps when full load are hovering around 50 - 60 degree. 

Full pc specs :

ASROCK Z97M Anniversary - https://www.asrock.com/mb/Intel/Z97M Anniversary

ASUS GTX 980 

i5 4670

8 GB DDR3 

 

pictures for better understanding 

https://i.imgur.com/OUFSYJd.png   

https://i.imgur.com/D3ixzvB.png

 

 

 

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all core turbo of the 4670 is by Intel is 3.6GHz (whatever the BIOS says cannot override the factory settings of a locked CPU), a bit lower because BCLK is below 100MHz as the clock gen is not accurate enough.

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: 1TB HP EX920 PCIe x4 M.2 SSD + 1TB Seagate 7200RPM 2.5" HDD (ST1000LM049-2GH172), 128GB Toshiba PCIe x2 M.2 SSD (KBG30ZMV128G) gone cooking externally 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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18 hours ago, Jurrunio said:

all core turbo of the 4670 is by Intel is 3.6GHz (whatever the BIOS says cannot override the factory settings of a locked CPU), a bit lower because BCLK is below 100MHz as the clock gen is not accurate enough.

This has been shown before as not true. In that example an i7-4790 running all cores at the top ratio of 40x on a B85 board no less and BCLK is pretty accurate, probably just seeing the effect of down spectrum which is usually set by default.

AWOL

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1 hour ago, X_X said:

This has been shown before as not true. In that example an i7-4790 running all cores at the top ratio of 40x on a B85 board no less and BCLK is pretty accurate, probably just seeing the effect of down spectrum which is usually set by default.

That's not a standard behaviour available from the start, you have to tweak it yourself. Just like skylake non-K.OC

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: 1TB HP EX920 PCIe x4 M.2 SSD + 1TB Seagate 7200RPM 2.5" HDD (ST1000LM049-2GH172), 128GB Toshiba PCIe x2 M.2 SSD (KBG30ZMV128G) gone cooking externally 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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By default turbo gives the largest boost as less cores are used, the more cores you use the less it will boost itself, there are some exploits that can be done on certain microcodes or some motherboard models or bios versions but those are actually quite rare, in most cases the cpu boost settings will override anything you got set in the bios.  

 

For the i5-4670 it will turbo boost itself up to 3.8 ghz on a single core and down to 3.6 Ghz when all cores are used.

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Regarding Haswell the only thing rare is a CPU with turbo not being able to run all cores at max default turbo, mobile can, desktop can and even Xeon can. IIRC that was standard from the start for Desktop but as it wasn't supposed to be like that, it got fixed up later on but AFAIK it can still be unfixed. Some of those locked Haswell mobile chips can even be fully unlocked.

AWOL

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i5 4670 Turbo Bins

1x Usage 38x

2x Usage 37x

3x usage 36x

4x Usage 36x

 

On SOME boards, MCE is available (using all cores at MaxTurbo 38x) Some boards had it updated out of them with Microcode, even if you revert bios, it doesn't always work now.

 

On SOME boards, you can enable slight changes like 3x Usage to be 37x and it Holds, but no other changes did

(One of my older boards did this, but did not have MCE available) but in testing, I can see it pretty clear it was working.

Not all boards...however.

Maximums - Asus Z97-K /w i5 4690 Bclk @106.9Mhz * x39 = 4.17Ghz, 8GB of 2600Mhz DDR3,.. Gigabyte GTX970 G1-Gaming @ 1550Mhz

 

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