Rebar drops Warzone FPS
A community test on an RTX 5090 + Ryzen 9950X3D shows enabling Resizable BAR (Rebar) reduced average FPS, frame lows, and GPU usage in Warzone — the poster recommends leaving Rebar off for better performance. The thread notes the setup was CPU‑bound at 1440p and the post drew significant attention (174 likes, ~32k views), so this is worth testing if you run a similar config. (x.com)
Multiple community threads on the NVIDIA forums and Steam report that enabling Resizable BAR (SAM) produced reduced FPS, microstutter, or lower GPU utilization in Call of Duty/Warzone on RTX 50‑series cards. (nvidia.com; steamcommunity.com) Players digging into Warzone’s local config found a GPUUploadHeaps entry in s.1.0.cod24.txt that community members toggle to disable ReBAR‑specific uploads, and several posts attribute stutter and frame‑low changes to that setting. (steamcommunity.com; steamcommunity.com/app/1938090/discussions) YouTube benchmarkers have run side‑by‑side ReBAR on/off comparisons on RTX 5090 rigs — TheBenchmarkNerd’s multi‑game tests and multiple 5090 Warzone uploads show mixed outcomes across games and resolutions rather than a consistent benefit. NVIDIA publishes a Resizable BAR firmware update tool and explicitly recommends updating GPU firmware plus BIOS settings (Above‑4G Decoding/Resizable BAR) for compatibility, while forum reports note some 5090 systems only enabled ReBAR after adjusting BIOS options like disabling CSM. (nvidia.custhelp.com; nvidia.com/forums) Industry sites flagged driver behavior around ReBAR — The FPS Review reported on June 28, 2025 that NVIDIA drivers could leave Resizable BAR disabled by default on some systems, prompting calls to verify driver and firmware versions when troubleshooting. (thefpsreview.com) Across threads and tests the emergent troubleshooting checklist is consistent: when a rig is CPU‑bound at 1440p or higher, ReBAR effects appear highly driver‑, BIOS‑, and game‑specific, so community recommendations focus on testing both ReBAR states and checking GPUUploadHeaps, BIOS Above‑4G/CSM, and firmware/driver versions. (steamcommunity.com; nvidia.com/forums; youtube.com/TheBenchmarkNerd)
