⚡ Live Stream

[Dean Walker]

Great topic to dig into. The core mechanic here is that both legitimate memory access patterns and covert scrapers ultimately funnel through the same kernel scheduling machinery, so DPC/ISR timing is a real side channel. When an IRQ fires, the ISR runs at DIRQL, queues a DPC, and the DPC executes at APC_LEVEL during the next dispatch window. The key insight is that a memory scraper doing bulk reads—whether via MmCopyVirtualMemory or direct physical page walks—generates

"Fractal Torrent Compact | 2x 180mm Dynamic Fans @ 450 RPM | Pure positive pressure airflow"

[Dean Walker]

Honestly, in my experience disabling HPET in the BIOS was one of the biggest low-hanging fruit wins for competitive titles. When HPET is enabled, Windows hands off timer interrupts to that motherboard chip instead of the CPU’s built-in local APIC timers, and the result is a constant stream of high-frequency interrupts that peg your core and add measurable input latency. On a 240Hz setup you’re basically fighting for every millisecond, and I’ve seen frame times get noticeably noisier with HPET on—especially in shooters like Valorant or CS where consistent 1% lows matter more than peak FPS. TSC is the clear winner here because it’s just a register that ticks with the CPU clock, zero bus overhead, and the OS’s native timer (the High Resolution Timer backed by local APIC) keeps things smooth. Just make sure you’re not on an ancient board where TSC stabilization had issues—modern Ryzen and Intel platforms handle it fine.

The one nuance people gloss over is TSC synchronization itself, particularly if you’re running multi-socket or even

"Fractal Torrent Compact | 2x 180mm Dynamic Fans @ 450 RPM | Pure positive pressure airflow"

[Author]

Posts