Simultaneous multithreading, called Hyper-Threading on Intel and SMT on AMD, lets each physical CPU core handle two threads at once. It is a huge help for productivity and streaming, but a small number of games and competitive players see steadier frame times with it switched off. This guide explains when disabling it might help, how to do it safely in BIOS, and how to measure whether it actually made a difference for you.
What SMT and Hyper-Threading do
A physical core with SMT presents itself as two logical cores to Windows, so an 8-core chip shows 16 threads. The second thread fills gaps when the core is waiting, boosting multitasking and heavily threaded workloads by 20-30%. Most modern games benefit from the extra threads too, which is why disabling it is the exception, not the rule.
When turning it off can help
A handful of older or lightly threaded esports titles occasionally scheduled threads inefficiently across logical cores, causing micro-stutter. Turning SMT off forced those games onto full physical cores and smoothed frame times. On modern hardware and games this is increasingly rare, but competitive players chasing the most consistent 1% lows still sometimes test it, and it can also reduce heat, freeing a little thermal headroom for boost.
How to disable it in BIOS
Restart and enter BIOS. On Intel boards, look under CPU configuration or Advanced for Hyper-Threading and set it to Disabled. On AMD boards, find SMT Control under the CPU or overclocking menu and set it to Disabled. Save and exit. Back in Windows, open Task Manager and confirm the logical processor count has halved, verifying the change took effect.
| Configuration | 8-core example | Best for |
|---|---|---|
| SMT / HT on | 8 cores, 16 threads | Streaming, multitasking, most games |
| SMT / HT off | 8 cores, 8 threads | Testing frame-time smoothness, lower heat |
Measure before deciding
Do not assume; test. Use a frame-time tool such as PresentMon or CapFrameX to record average FPS and 1% lows in your actual games, once with SMT on and once off, keeping every other setting identical. Only keep it disabled if the 1% lows or frame-time consistency clearly improve. In most modern games you will see equal or slightly worse results with it off, which is why the feature exists.
The downsides to weigh
With SMT off you lose a large chunk of multi-threaded performance, so streaming while gaming, video editing, compiling, and heavily threaded newer games can suffer. If you do anything besides pure gaming, the productivity hit usually outweighs any tiny gaming gain. This is a niche tweak best reserved for single-purpose competitive rigs where you have measured a real benefit.
An alternative: leave it on and fix scheduling
Often the smarter move is to keep SMT enabled and instead ensure Windows and your chipset drivers are current, since scheduler improvements over the years resolved most of the old thread-placement problems. Setting a game’s CPU affinity or using the correct power plan can capture the smoothness benefit without sacrificing your extra threads.
Frequently asked questions
Will disabling Hyper-Threading increase my FPS?
Rarely on modern hardware. Most current games use the extra threads well, so disabling SMT usually leaves average FPS the same or slightly lower. The only realistic gain is marginally steadier frame times in specific lightly threaded titles, and even that must be verified with a frame-time tool rather than assumed.
Is it safe to turn SMT off and on?
Completely safe and fully reversible. It is just a BIOS toggle that changes how many threads the CPU exposes; it does not affect hardware health. You can switch it back at any time, so testing both states costs nothing but a couple of reboots.
Bottom line
Disabling SMT or Hyper-Threading is a niche competitive tweak, not a universal upgrade. Toggle it in BIOS, verify the thread count in Task Manager, and measure 1% lows in your real games before committing. For nearly everyone who also streams or multitasks, leaving it on is the right call.
