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Core speed dropping

post #1 of 4
Thread Starter 
Hey guys, i have a perplexing problem here... Under prime95 and sandra's burn in testing, it would seem my cpu is dropping from the 4.8ghz i have it set at to around 4.4/4.5ghz. From a quick google session after rebooting, i saw that it could very well be the MOSFETs overheating and subsequently reducing the clock speed on the processor to keep temps down. Heres a quick resume of my build

i7-3770k @4.8mhz/1.345v
MSI Z77A-GD65
Kingston HyperX Beast 1866mhz (no OC)
Asus GTX660DC2 x2 SLI
Corsair TX850 (soon to be RM850 or AX860i)
Noctua NH-D14 to keep my baby cool smile.gif

So, could it be the MOSFETs acting up under high heat? or should i look towards more serious issues with the mobo/processor?
I have a rather large budget, so swapping out the heatsinks is always an option.


EDIT- Forgot to mention that i stressed it for 3 hours, and heated up the house so hard the heating shut off. was pushing around 90C on cores 1 and 2 (0 and 3 were revolving around the 85C mark)
Edited by blackmagic12345 - 3/24/14 at 8:40pm
Frankenstein
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CPUMotherboardGraphicsRAM
Intel Core i7-3770k MSI Z77-GD65 Gaming Asus GTX 660 DirectCU II OC Kingston HyperX Beast 
Hard DriveHard DriveHard DriveHard Drive
Western Digital Blue EZEX Seagate Barracuda Western Digital Black FZEX Seagate Barracuda  
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kingston HyperX 3k LG Noctua NH-D14 Windows 7 Home Premium sp1 
OSOSMonitorMonitor
Kubuntu 13.01 SteamOS Alchemist Samsung SyncMaster S27B350 Samsung SyncMaster S27B370 
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Frankenstein
(20 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7-3770k MSI Z77-GD65 Gaming Asus GTX 660 DirectCU II OC Kingston HyperX Beast 
Hard DriveHard DriveHard DriveHard Drive
Western Digital Blue EZEX Seagate Barracuda Western Digital Black FZEX Seagate Barracuda  
Hard DriveOptical DriveCoolingOS
kingston HyperX 3k LG Noctua NH-D14 Windows 7 Home Premium sp1 
OSOSMonitorMonitor
Kubuntu 13.01 SteamOS Alchemist Samsung SyncMaster S27B350 Samsung SyncMaster S27B370 
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Cooler Master Storm QuickFire Pro Corsair TX850  Cooler Master Storm Trooper Logitech G600 
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post #2 of 4
You mean 4.8 GHz, not 4.6 mhz right? 85°-90°C seems fine, but on the high limit of temperatures thats 15°C away from tjmax which is 105°C, somewhere you'll never want to go near or above in CPU core temperatures. I would lower the overclock to 4.7 GHz if it requires a lot less voltage to get it stable.

What kind of testing are you doing on prime 95? Small FFTs? Large FFTs? Blend? Also which version of Prime 95 are you using?

And about your PSU, I would get a PSU such as the Cooler Master V750. You don't need 850W to power two ASUS GTX 660's unless you're going to overvolt the graphic cards.

Plus the coil whine in the Cooler Master V series is almost nothing compared to the RM850 or the AX860i, I'd stay away from the RM series of Corsair if I was you. Their overpriced and you can get better quality PSU for a lower price.
Edited by benjamen50 - 3/25/14 at 2:35am
Gaming Computer
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Gaming Computer
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Hard DriveOptical DriveCoolingOS
Western Digital 1 TB Pioneer Noctua NH-U9B Windows 7 Ultimate 64-bit 
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Dell Monitor Logitech G110 Antec 750W Thermaltake Aluminium Old Case 
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post #3 of 4
Thread Starter 
Ahh crap yeah meant ghz, and I was doing small ffts and I'm using the latest version. I got a few different opinions from work, one is that its throttling due to temps and the other would be blown CPU or mobo.
Frankenstein
(20 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7-3770k MSI Z77-GD65 Gaming Asus GTX 660 DirectCU II OC Kingston HyperX Beast 
Hard DriveHard DriveHard DriveHard Drive
Western Digital Blue EZEX Seagate Barracuda Western Digital Black FZEX Seagate Barracuda  
Hard DriveOptical DriveCoolingOS
kingston HyperX 3k LG Noctua NH-D14 Windows 7 Home Premium sp1 
OSOSMonitorMonitor
Kubuntu 13.01 SteamOS Alchemist Samsung SyncMaster S27B350 Samsung SyncMaster S27B370 
KeyboardPowerCaseMouse
Cooler Master Storm QuickFire Pro Corsair TX850  Cooler Master Storm Trooper Logitech G600 
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Frankenstein
(20 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7-3770k MSI Z77-GD65 Gaming Asus GTX 660 DirectCU II OC Kingston HyperX Beast 
Hard DriveHard DriveHard DriveHard Drive
Western Digital Blue EZEX Seagate Barracuda Western Digital Black FZEX Seagate Barracuda  
Hard DriveOptical DriveCoolingOS
kingston HyperX 3k LG Noctua NH-D14 Windows 7 Home Premium sp1 
OSOSMonitorMonitor
Kubuntu 13.01 SteamOS Alchemist Samsung SyncMaster S27B350 Samsung SyncMaster S27B370 
KeyboardPowerCaseMouse
Cooler Master Storm QuickFire Pro Corsair TX850  Cooler Master Storm Trooper Logitech G600 
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Reply
post #4 of 4
Download ThrottleStop and click on the TPL button so you can have a look at your Turbo Power Limits. If these are set too low in the bios, it's possible that these power limits can limit your maximum overclock which will result in the CPU rapidly throttling. There is also an item called BD PROCHOT. I don't think that is the problem but make sure that BD PROCHOT is not checked.

Post some screen shots while full load testing. In theory these CPUs do not start thermal throttling until they reach a core temperature of 105C but it is possible for manufacturers to apply an offset of up to 15C. If your motherboard manufacturer did this you would start thermal throttling at only 90C (105C - 15C offset). This is common on laptops but not very common on desktop motherboards. ThrottleStop also reports this information on the main screen.

If you have a house hold fan handy, point it towards your voltage regulators and see if that helps your CPU maintain its full overclocked speed.

CPUs either work or they don't work so I am not betting on a blown CPU. Some motherboards simply can not deliver enough power to the CPU socket so when full load testing, something has to give and the CPU will throttle back and slow down.
Edited by unclewebb - 3/25/14 at 9:06am
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