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Prime95 Blend not stressing CPU 100%?

post #1 of 4
Thread Starter 
I am working on my friend's dad's machine (it's a Dell Optiplex 745) because he was having random crashes, BSODs, black screens, etc. I am testing every single component for issues and I decided to do a few hours of Prime95 blend to make sure the CPU and memory were stable. So I ran the program and I noticed that while the max amount of RAM was being utilized (~1GB), the CPU was only seeing minimal usage (~5%). It spiked to 100% when I first started the torture test, then 5 seconds later instantaneously dropped down to ~5%. Is this supposed to happen (I reckon not), or better question is: what am I supposed to make of this?

Here are some pictures assessing my situation:

img1771f.jpg
img1772a.jpg
img1773l.jpg

Regards,
Aznboy
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Buena Vista
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post #2 of 4
CPU might be bad, or the board. I would contact Dell.

Have you tried any other stress tests (OCCT, Linpack, etc)?
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post #3 of 4
Thread Starter 
I've used Linpack and it stressed the CPU perfectly fine and passed the tests too. I will try OCCT.


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Buena Vista
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CPUMotherboardGraphicsRAM
Intel Core i7 4790K [4.6GHz] [1.25V] Asus Maximus VII Formula [BIOS 3003] NVIDIA GTX 1080 Ti FE [2050MHz] [12GHz QDR] Samsung MV-3V4G3 16GB (4x4GB) DDR3 2133 
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Intel 535 Series 240GB [RAID 1] Crucial M500 960GB Seagate Barracuda 3TB Western Digital VelociRaptor 500GB [RAID 0] 
CoolingCoolingOSMonitor
Corsair H110i GT (Qty 2) Phanteks PH-F140XP Microsoft Windows 10 Pro [64-bit] Dell S2716DG [G-Sync] 
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Razer BlackWidow Chroma EVGA Supernova G2 1300W NZXT H440 [Black/Red] Logitech G900 
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Buena Vista
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Intel Core i7 4790K [4.6GHz] [1.25V] Asus Maximus VII Formula [BIOS 3003] NVIDIA GTX 1080 Ti FE [2050MHz] [12GHz QDR] Samsung MV-3V4G3 16GB (4x4GB) DDR3 2133 
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Intel 535 Series 240GB [RAID 1] Crucial M500 960GB Seagate Barracuda 3TB Western Digital VelociRaptor 500GB [RAID 0] 
CoolingCoolingOSMonitor
Corsair H110i GT (Qty 2) Phanteks PH-F140XP Microsoft Windows 10 Pro [64-bit] Dell S2716DG [G-Sync] 
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Razer BlackWidow Chroma EVGA Supernova G2 1300W NZXT H440 [Black/Red] Logitech G900 
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post #4 of 4
You might be using more Ram in P95 than that is free. Try test with 500Mb Ram.
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