• Welcome to TechPowerUp Forums, Guest! Please check out our forum guidelines for info related to our community.

GPU-Z PerfCap Log Number Meanings

Jun 25, 2014
1 (0.00/day)
System Name X79 Build
Processor i7 4930k
Motherboard Asus X79 Deluxe
Cooling H100i
Memory Mushkin 4x4GB DDR3 2133 10-11-10-28
Video Card(s) Asus GTX 780 Ti
Storage Samsung 512GB 840 Pro SSD plus 5 other HDDs totalling 7.28TB
Display(s) Samsung P2370HD
Case Corsair Obsidian 650D
Power Supply Cooler Master V850
Software Um... lots?
Hello, everyone. I used GPU-Z today to log the activities of my video card to a file while I was playing a game because I'm getting freezing and artifacts at times, and I was wondering what 1 of the items meant.

I know PerfCap in GPU-Z means Performance Cap, and there are text values in GPU-Z itself for the PerfCap item, but the values under PerfCap in the log file are all just numbers (4, 12, and 16). Does anyone know what each number corresponds to in GPU-Z so I can figure out what the actual performance cap reason was at various times during my play session? Most of the time when I glanced over at my second monitor to look at GPU-Z, there were 2 colored bars being shown in PerfCap, but I have no idea what they were, which is why I'm trying to figure out the log file's PerfCap numbers.

If anyone can tell me what each number in the PerfCap Reason column means, that would be great!

As a side note, I know a lot of you are going to tell me my video card is bad if I'm getting artifacts and freezing, but this is my second GTX 780 Ti that's given me problems (out of only 2 780 Tis), so I want to make sure there's not something else wrong with my computer instead before I do another RMA.


New Member
Aug 8, 2014
1 (0.00/day)
I would also find it very helpful to know what the PrefCap log values indicate, I get 16, 13, 12, and 1. I have had no success searching for a reference.


Staff member
May 14, 2004
22,010 (3.56/day)
Processor Core i7-8700K
Memory 32 GB
Video Card(s) RTX 3080
Display(s) 30" 2560x1600 + 19" 1280x1024
Software Windows 10 64-bit
  * Power. Indicating perf is limited by total power limit.
  * Thermal. Indicating perf is limited by temperature limit.
  * Reliability. Indicating perf is limited by reliability voltage.
  * Operating. Indicating perf is limited by max operating voltage.
  * Utilization. Indicating perf is limited by GPU utilization.

the value can be a combination of multiple of these values added together (bitwise OR operation)