Resizable BAR / Smart Access Memory
Also searched as: rebar · resizable bar · SAM · smart access memory · above 4g decoding
What it does
Lets the CPU access the GPU's whole VRAM in one mapping instead of small chunks (BIOS + driver).
The honest verdict
Real but title-dependent — a few percent in many games, big in a handful, slightly negative in rare ones. Enable it, measure, and disable per-title only if a game regresses.
How Compy treats it
Where it genuinely fits a rig, Compy can recommend it — applied with a snapshot first and a one-click rollback after, like every change it makes.
The Compy Blackbook holds 174 graded entries like this one, judged against your hardware — and every change it does make is reversible, with the receipt to prove it.
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