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GPU usage observation

post #1 of 3
Thread Starter 
After I got my loop going, I down clocked everything to stock. Just for a few days to ensure I am comfortable with the temperature and stuff - no air bubbles left, heat sinks installed right, etc. etc. I ran some benchmarks just to gauge the temperatures at stock. Ran Heaven 2.1 benchmark and temperatures where very good. I was about 32 - 34c one card and 38c on the other. Hard to tell from MSI AB monitor which one is the hotter card - top or bottom. Regardless, they were both good. One observation is that GPU usage during the benchmark was varying a lot. It was jumping around from 79 - 99%. If I remember right when I had my CPU and GPU overclocked, they were always a constant 98 or 98%. Curious why this happened. Did not change anything except downclocked both my CPU and GPUs. I wonder since I put the CPU back to stock from 3.8Ghz that cause it.
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Wife's bane
(17 items)
 
  
CPUMotherboardGraphicsRAM
i5-3570K @ 4.5 Ghz Gigabyte Z77 UD3H HIS R9-290 8 GB Samsung Wonder RAM 
Hard DriveHard DriveOptical DriveCooling
Crucial SSD for OS Samsung Spinpoint F3 Asus XSPC water block, 360 radiator, and 720 reservo... 
CoolingOSMonitorKeyboard
GPU cooling - XSPC Razer full GPU blocks Win 7 Home Premium Asus PB278Q 2560 X 1440p ISP Logitech G15 
PowerCaseMouseMouse Pad
NZXT Hale90 V2 NZXT Switch 810 Logitech G500 Steelseries QcK 
Audio
Optical out to Sony receiver; Deftech Monitor 3... 
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post #2 of 3
This is likely due to the cpu not keeping the gpu fed at stock clocks. I would recommend 3.4ghz or better on the cpu to keep the gpu fed. In my setup, depending on the game and resolution, dropping below 3.6ghz nets me similar results as your experiencing.
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2x 1 TB WD Black Raid 0  Lite-On 24x DVDr-RW DL Pump: Swiftech MCP35x2 RAD: 2x MCR320  
CoolingCoolingCoolingCooling
RAD: HW Labs GTX 360 Stealth GPU's: 2 x EK FC-6950 CPU: EK Supreme HF Scythe Ultra Kaze 3K RPM x10 
CoolingOSMonitorKeyboard
Zalman MFC1 Plus Fan Controller x2 Win 7 Pro x64 3 x Asus VW246 Logitech G15 rev1 
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post #3 of 3
Thread Starter 
Thanks. I figured that would be the issue. I had my CPU overclocked. Down clocked it for a few days to sort out all my water cooling issues.
Wife's bane
(17 items)
 
  
CPUMotherboardGraphicsRAM
i5-3570K @ 4.5 Ghz Gigabyte Z77 UD3H HIS R9-290 8 GB Samsung Wonder RAM 
Hard DriveHard DriveOptical DriveCooling
Crucial SSD for OS Samsung Spinpoint F3 Asus XSPC water block, 360 radiator, and 720 reservo... 
CoolingOSMonitorKeyboard
GPU cooling - XSPC Razer full GPU blocks Win 7 Home Premium Asus PB278Q 2560 X 1440p ISP Logitech G15 
PowerCaseMouseMouse Pad
NZXT Hale90 V2 NZXT Switch 810 Logitech G500 Steelseries QcK 
Audio
Optical out to Sony receiver; Deftech Monitor 3... 
  hide details  
Reply
Wife's bane
(17 items)
 
  
CPUMotherboardGraphicsRAM
i5-3570K @ 4.5 Ghz Gigabyte Z77 UD3H HIS R9-290 8 GB Samsung Wonder RAM 
Hard DriveHard DriveOptical DriveCooling
Crucial SSD for OS Samsung Spinpoint F3 Asus XSPC water block, 360 radiator, and 720 reservo... 
CoolingOSMonitorKeyboard
GPU cooling - XSPC Razer full GPU blocks Win 7 Home Premium Asus PB278Q 2560 X 1440p ISP Logitech G15 
PowerCaseMouseMouse Pad
NZXT Hale90 V2 NZXT Switch 810 Logitech G500 Steelseries QcK 
Audio
Optical out to Sony receiver; Deftech Monitor 3... 
  hide details  
Reply
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