How to save energy on gaming: Experiments with lowering power target on the GeForce GTX 1080 Ti

Before I begin, I'd like to provide some relevant background information.

My bedroom has a tendency to trap heat, and is usually the warmest room in the house. It also faces west, which means that in the summer months, the room can get unbearably hot unless the central AC system is turned on full-blast, complicated by the fact that there is only one HVAC register in the room. With the Astaroth desktop's power draw often exceeding 400W under full gaming load, converting most of this energy into heat, keeping the room at a reasonable temperature during long gaming sessions can be challenging.

This led me to the question: How do I get the system to run cooler and use less energy without unacceptably degrading game performance? Read on for the answer...

Overview of the Astaroth desktop

Throughout this blog, I'll be referencing Astaroth, my custom-built desktop named after the demon in the Ars Goetia. This post will serve as an overview of the system and its capabilities.

Astaroth is an AMD Ryzen-based full-tower desktop PC designed for both gaming and workstation applications. It is the first desktop built entirely on my own, and represents the largest investment I've ever made into any computer, emphasizing long-term performance, scalability, and upgradability. Here are the specs:

• ASUS ROG Crosshair VI Extreme AM4 EATX motherboard
• AMD Ryzen 7 1800X (8C/16T @ 3.6–4.0+ GHz)
• Corsair H100i v2 240mm liquid cooler with AM4 retention bracket
• 32 GB (2x16GB) G.SKILL Ripjaws V DDR4-3200 memory (operating at 2933 MT/s)
• EVGA GeForce GTX 1080 Ti FTW3 Gaming (3584 CUDA cores @ 1569–1683+ MHz, 11 GB GDDR5X @ 12 Gbps)
• 1 TB (1,024 GB) Samsung SSD 960 PRO for boot and applications
• 1 TB (1,024 GB) SanDisk Ultra 3D SSD for bulk storage
• 500 GB Samsung SSD 860 EVO for virtual machines and scrap space
• Seasonic PRIME Titanium 850W power supply
• Corsair Graphite 760T full-tower case
• Dell S2417DG gaming monitor (23.8" TN, 1440p 144+ Hz with G-SYNC)

Astaroth will serve as my primary platform for much of my benchmarks, gaming, and performance tuning. I've posted pictures of the rig on Flickr if you'd like to take a closer look.

Draco