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Intel Core i7 4790k Locked at 800mhz?

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Go to solution Solved by unclewebb,

This is usually caused by a bad sensor on your motherboard.  It can signal the CPU using the BD PROCHOT (bi-directional processor hot) signal path and trick the CPU into thinking that the CPU is running too hot even when it is not.  This forces the CPU to use the minimum multiplier (8) so it slows down to a crawl, even when loaded.  

 

To block these signals, try using ThrottleStop and disable BD PROCHOT.  Your CPU should immediately jump up to its full rated speed.  

 

ThrottleStop 8.00

https://drive.google.com/open?id=0B0dpSo9k93jDTE1fcHNtbUMwdGc

Posted

Just go onto the computer and I have noticed that it is really slow. So I opened up CPUZ to find that my cpu is locked with a multiplier of x8. I went back into my mobo and reset it back to default, booted back up and it is still locked at x8. I reapply an older bios update and it is still the same.

 

What is the problem here. Is it the mobo or the cpu? 

Had this PC back in October of 2014 running strong till now. 

CPU: Intel Core i7-4790K Quad-Core Processor | CPU Cooler: Corsair H100i 77.0 CFM Liquid CPU Cooler | Motherboard: MSI Z97-GAMING 7 ATX LGA1150 Motherboard | Memory: Corsair Vengeance 16GB | Storage: Samsung 840 EVO 500GB 2.5" Solid State Drive, Seagate 4TB 3.5" 5900RPM Internal Hard Drive | Video Card: EVGA GeForce GTX 970 3.5GB ACX 2.0 Video Card x2 SLI| Case: Corsair 450D ATX Mid Tower Case | Power Supply: EVGA SuperNOVA 750 G2 

 

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Just go onto the computer and I have noticed that it is really slow. So I opened up CPUZ to find that my cpu is locked with a multiplier of x8. I went back into my mobo and reset it back to default, booted back up and it is still locked at x8. I reapply an older bios update and it is still the same.

 

What is the problem here. Is it the mobo or the cpu? 

Had this PC back in October of 2014 running strong till now. 

You didn't mention the CPU temperature.

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Make sure the core ratio is at auto...

Spoiler

 

LTT's Fastest single core CineBench 11.5/15 score on air with i7-4790K on air

Main Rig

CPU: i7-4770K @ 4.3GHz 1.18v, Cooler: Noctua NH-U14S, Motherboard: Asus Sabertooth Mark 2, RAM: 16 GB G.Skill Sniper Series @ 1866MHz, GPU: EVGA 980Ti Classified @ 1507/1977MHz , Storage: 500GB 850 EVO, WD Cavier Black/Blue 1TB+1TB,  Power Supply: Corsair HX 750W, Case: Fractal Design r4 Black Pearl w/ Window, OS: Windows 10 Home 64bit

 

Plex Server WIP

CPU: i5-3570K, Cooler: Stock, Motherboard: ASrock, Ram: 16GB, GPU: Intel igpu, Storage: 120GB Kingston SSD, 6TB WD Red, Powersupply: Corsair TX 750W, Case: Corsair Carbide Spec-01 OS: Windows 10

 

Lenovo Legion Laptop

CPU: i7-7700HQ, RAM: 8GB, GPU: 1050Ti 4GB, Storage: 500GB Crucial MX500, OS: Windows 10

 

 

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Posted

Just go onto the computer and I have noticed that it is really slow. So I opened up CPUZ to find that my cpu is locked with a multiplier of x8. I went back into my mobo and reset it back to default, booted back up and it is still locked at x8. I reapply an older bios update and it is still the same.

 

What is the problem here. Is it the mobo or the cpu? 

Had this PC back in October of 2014 running strong till now. 

Locked at 800mhz?

Control panel>Power settings>High performance

Try that.

i7 8086k @ 5.3Ghz / 32GB DDR4 Trident Z RGB @ 3733Mhz / Aorus GTX 1080 11Gbps / PG348Q

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You didn't mention the CPU temperature.

CPU temp is at 33 idle and around 65 under load.

CPU: Intel Core i7-4790K Quad-Core Processor | CPU Cooler: Corsair H100i 77.0 CFM Liquid CPU Cooler | Motherboard: MSI Z97-GAMING 7 ATX LGA1150 Motherboard | Memory: Corsair Vengeance 16GB | Storage: Samsung 840 EVO 500GB 2.5" Solid State Drive, Seagate 4TB 3.5" 5900RPM Internal Hard Drive | Video Card: EVGA GeForce GTX 970 3.5GB ACX 2.0 Video Card x2 SLI| Case: Corsair 450D ATX Mid Tower Case | Power Supply: EVGA SuperNOVA 750 G2 

 

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Make sure the core ratio is at auto...

Everything is at auto.

 

Locked at 800mhz?

Control panel>Power settings>High performance

Try that.

Just tried it, and it is still locked at 800mhz...

CPU: Intel Core i7-4790K Quad-Core Processor | CPU Cooler: Corsair H100i 77.0 CFM Liquid CPU Cooler | Motherboard: MSI Z97-GAMING 7 ATX LGA1150 Motherboard | Memory: Corsair Vengeance 16GB | Storage: Samsung 840 EVO 500GB 2.5" Solid State Drive, Seagate 4TB 3.5" 5900RPM Internal Hard Drive | Video Card: EVGA GeForce GTX 970 3.5GB ACX 2.0 Video Card x2 SLI| Case: Corsair 450D ATX Mid Tower Case | Power Supply: EVGA SuperNOVA 750 G2 

 

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Could it be that my CPU is malfunctioning?

 

If that is the case, then has anyone here ever have to deal with Intel's RMA?

CPU: Intel Core i7-4790K Quad-Core Processor | CPU Cooler: Corsair H100i 77.0 CFM Liquid CPU Cooler | Motherboard: MSI Z97-GAMING 7 ATX LGA1150 Motherboard | Memory: Corsair Vengeance 16GB | Storage: Samsung 840 EVO 500GB 2.5" Solid State Drive, Seagate 4TB 3.5" 5900RPM Internal Hard Drive | Video Card: EVGA GeForce GTX 970 3.5GB ACX 2.0 Video Card x2 SLI| Case: Corsair 450D ATX Mid Tower Case | Power Supply: EVGA SuperNOVA 750 G2 

 

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Could it be that my CPU is malfunctioning?

 

If that is the case, then has anyone here ever have to deal with Intel's RMA?

I've delt with Newegg rma on my last 4790k. Temps were in the 90c. They took it back with out any issues

Spoiler

 

LTT's Fastest single core CineBench 11.5/15 score on air with i7-4790K on air

Main Rig

CPU: i7-4770K @ 4.3GHz 1.18v, Cooler: Noctua NH-U14S, Motherboard: Asus Sabertooth Mark 2, RAM: 16 GB G.Skill Sniper Series @ 1866MHz, GPU: EVGA 980Ti Classified @ 1507/1977MHz , Storage: 500GB 850 EVO, WD Cavier Black/Blue 1TB+1TB,  Power Supply: Corsair HX 750W, Case: Fractal Design r4 Black Pearl w/ Window, OS: Windows 10 Home 64bit

 

Plex Server WIP

CPU: i5-3570K, Cooler: Stock, Motherboard: ASrock, Ram: 16GB, GPU: Intel igpu, Storage: 120GB Kingston SSD, 6TB WD Red, Powersupply: Corsair TX 750W, Case: Corsair Carbide Spec-01 OS: Windows 10

 

Lenovo Legion Laptop

CPU: i7-7700HQ, RAM: 8GB, GPU: 1050Ti 4GB, Storage: 500GB Crucial MX500, OS: Windows 10

 

 

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I've delt with Newegg rma on my last 4790k. Temps were in the 90c. They took it back with out any issues

Sadly I didn't buy it from Newegg. I got it from NCIXUS due to a black friday sales.

 

Going to contact Intel and see what they can do, before I contact NCIXUS.

CPU: Intel Core i7-4790K Quad-Core Processor | CPU Cooler: Corsair H100i 77.0 CFM Liquid CPU Cooler | Motherboard: MSI Z97-GAMING 7 ATX LGA1150 Motherboard | Memory: Corsair Vengeance 16GB | Storage: Samsung 840 EVO 500GB 2.5" Solid State Drive, Seagate 4TB 3.5" 5900RPM Internal Hard Drive | Video Card: EVGA GeForce GTX 970 3.5GB ACX 2.0 Video Card x2 SLI| Case: Corsair 450D ATX Mid Tower Case | Power Supply: EVGA SuperNOVA 750 G2 

 

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  • Solution

This is usually caused by a bad sensor on your motherboard.  It can signal the CPU using the BD PROCHOT (bi-directional processor hot) signal path and trick the CPU into thinking that the CPU is running too hot even when it is not.  This forces the CPU to use the minimum multiplier (8) so it slows down to a crawl, even when loaded.  

 

To block these signals, try using ThrottleStop and disable BD PROCHOT.  Your CPU should immediately jump up to its full rated speed.  

 

ThrottleStop 8.00

https://drive.google.com/open?id=0B0dpSo9k93jDTE1fcHNtbUMwdGc

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This is usually caused by a bad sensor on your motherboard.  It can signal the CPU using the BD PROCHOT (bi-directional processor hot) signal path and trick the CPU into thinking that the CPU is running too hot even when it is not.  This forces the CPU to use the minimum multiplier (8) so it slows down to a crawl, even when loaded.  

 

To block these signals, try using ThrottleStop and disable BD PROCHOT.  Your CPU should immediately jump up to its full rated speed.  

 

ThrottleStop 8.00

https://drive.google.com/open?id=0B0dpSo9k93jDTE1fcHNtbUMwdGc

Sorry for the late response. Thank you, it works!

CPU: Intel Core i7-4790K Quad-Core Processor | CPU Cooler: Corsair H100i 77.0 CFM Liquid CPU Cooler | Motherboard: MSI Z97-GAMING 7 ATX LGA1150 Motherboard | Memory: Corsair Vengeance 16GB | Storage: Samsung 840 EVO 500GB 2.5" Solid State Drive, Seagate 4TB 3.5" 5900RPM Internal Hard Drive | Video Card: EVGA GeForce GTX 970 3.5GB ACX 2.0 Video Card x2 SLI| Case: Corsair 450D ATX Mid Tower Case | Power Supply: EVGA SuperNOVA 750 G2 

 

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