RAM Subtimings Tuning Guide: Maximize 0.1% Lows & Cache Eviction
Deep dive into secondary and tertiary memory sub-timings. Learn why tightening tRFC, tFAW, and maximizing tREFI doubles 0.1% low framerate stability in modern games.
Loose Factory XMP / EXPO Secondary & Tertiary Memory Timings
XMP and EXPO only set primary timings (CL-tRCD-tRP-tRAS). Motherboard auto settings leave secondary timings dangerously loose, crippling memory bandwidth.
Primary CAS latency only dictates initial read delays. In gaming, memory controllers constantly refresh capacitor banks and write data bursts. Loose tRFC (Row Refresh Cycle) forces the CPU to wait hundreds of clock cycles between refreshes. By tuning tRFC, setting tFAW to 16, and maximizing tREFI (Refresh Interval), memory read bandwidth increases by up to 25GB/s, transforming choppy 0.1% lows into glass-smooth frametimes.
tRFC Row Refresh Cycle Compression
Compressing tRFC from stock 550ns down to 350ns for rapid bank availability.
tFAW (Four Activate Window) Set to 16
Minimizing the delay between consecutive row activations.
tREFI Refresh Interval Maximization
Extending refresh intervals to 65535 to keep memory open for game data.
OCCT & Karhu Memory Stability Testing
Verifying zero memory errors to guarantee 100% rock-solid game stability.
Ready for Flat Glass-Smooth Frametimes?
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