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The quick answer
Start with the highest-probability fix first.
If you are unsure which Reflex mode to use, start with Reflex On. Move to On + Boost when your GPU clocks down too aggressively, your system is frequently CPU-bound, or your frame pacing improves only when the GPU stays more awake. On laptops, be careful: On + Boost can increase heat, fan noise, and throttling.
01 Decision matrix
Pick your CPU and GPU tier, then read the recommendation.
02 What “Boost” changes
It tries to keep the GPU more awake.
Standard Reflex On lowers render queue latency. On + Boost adds more aggressive GPU clock behavior so the GPU is less likely to dip into lower power states at the wrong time. On some systems that improves responsiveness; on others it only adds heat.
| Mode | Best for | Watch out for |
|---|---|---|
| On | Most desktops and already-stable systems | May not hold GPU clocks as aggressively |
| On + Boost | CPU-bound cases, uneven GPU clocks, some laptops on AC power | More heat, more fan noise, possible thermal throttling |
03 Laptop warning
More aggression is not always more performance.
If your laptop already runs hot, On + Boost can pin clocks high enough that the system starts throttling. Test both modes in the same map, same cap, same power mode, and the same room temperature before deciding.
Frequently asked questions
Does On + Boost always reduce latency further?
Not always. It can, but only if your system benefits from the more aggressive clock behavior and does not run into heat or power limits.
Should I use it with uncapped FPS?
Test carefully. Some systems are more stable with a sensible cap.
Is this only for NVIDIA users?
Reflex is an NVIDIA feature. The general CPU-bound logic is still useful either way.