Is "GPU IRQ Affinity (Isolate)" safe to switch on?

An expert setting for a measured problem. If you have not looked at DPC latency, skip it. The main cost: On most systems the default distribution is fine, and a fixed policy can be worse than letting Windows decide.

Is "GPU IRQ Affinity (Isolate)" free in Frozen Tweaks?

It is part of Frozen Pro and Elite. You can also make the change by hand with the values on this page.

GPU interrupt affinity: moving graphics card interrupts off core 0

Frost LIVECPUProUndo: YesUpdated Oct 8, 2026View as Markdown

Short answer

Updated Oct 8, 2026

By default Windows may deliver a device's interrupts to any core, and core 0 usually ends up busiest because many drivers and Windows itself favor it. This tweak sets an interrupt affinity policy on the graphics card so its interrupts go to other cores.

What it does

In the app the switch is called "GPU IRQ Affinity (Isolate)", described there as: Pins GPU interrupts away from CPU0/1 to reduce contention (advanced, per-device).

When it helps, and when it hurts

When it helps

Systems where core 0 is saturated and LatencyMon shows high DPC times from the graphics driver.

When it hurts

On most systems the default distribution is fine, and a fixed policy can be worse than letting Windows decide.
It is per device, needs a restart, and a wrong affinity can lower performance.

What it writes

Exactly what the switch changes, read from the app's source. Switching it off is what the app writes when you turn the tweak off again.

This tweak has no fixed list of registry values to print here: it works through a driver's own settings, scheduled tasks or values that differ from PC to PC (per device, per adapter or per installed game). The app reads what your PC has and changes only that.

How to undo it

In the app: Yes

Switching it off sets a standard Windows value, which may not be exactly how you had it.

Switch the tweak off in Frozen Tweaks.

Changing several settings at once? The app's Make a restore point button, on every plan, makes a Windows restore point before you start.

Verdict

An expert setting for a measured problem. If you have not looked at DPC latency, skip it.

Questions

Is "GPU IRQ Affinity (Isolate)" safe to switch on?: An expert setting for a measured problem. If you have not looked at DPC latency, skip it. The main cost: On most systems the default distribution is fine, and a fixed policy can be worse than letting Windows decide.
How do I undo it?: Switch the tweak off in Frozen Tweaks. Switching it off sets a standard Windows value, which may not be exactly how you had it.
Is "GPU IRQ Affinity (Isolate)" free in Frozen Tweaks?: It is part of Frozen Pro and Elite. You can also make the change by hand with the values on this page.

In the app