CS2 BIOS Settings for Intel (2026): XMP, ReBAR, Microcode

CS2 is CPU-bound on almost every Intel + NVIDIA build, so the BIOS is where the biggest 1%-low wins hide. Here are the settings that matter — XMP, ReBAR, microcode — plus the Raptor Lake degradation warning.

CS2 leans on your CPU more than your GPU on almost every modern build, which means the BIOS is where some of the biggest — and most overlooked — gains live, especially for 1% lows. A few settings are near-free FPS; one (microcode) is critical if you own a 13th or 14th gen Intel chip. Here's the list, and the things you should not touch.

The BIOS settings that matter for CS2

Setting	Value	Why
XMP / EXPO	Enabled	Without it, DDR5 runs at 4800 instead of its rated speed. Enabling it alone can add 5–15% gaming FPS.
Resizable BAR (ReBAR)	Enabled	Small average gain but multiple 13900K-class users report much better 1% lows — especially when also forced for cs2.exe in NVIDIA Profile Inspector.
Above 4G Decoding	Enabled	Prerequisite for ReBAR — enable it first.
Intel Turbo Boost	Enabled	Always. Plus Turbo Boost Max 3.0 if available.
C-States	Enabled	Modern boost algorithms use C-States to free power budget so active cores boost higher. The old "disable C-States" advice hurts current CPUs.
Intel Default Settings	Performance (13700K/14700K) / Extreme (13900K/14900K)	Use Intel's official profile — not the third-party "Baseline" profile, which Intel says is different.
Microcode	Update BIOS to one with 0x12F	The current recommended Raptor Lake mitigation — see the warning below.
Secure Boot	Enabled	Required by FACEIT Anti-Cheat; no performance cost.

Raptor Lake (13th/14th gen): the degradation warning

13th and 14th gen Intel chips had a Vmin-shift degradation issue. It's mitigated by (a) updating your BIOS to a version containing microcode 0x12F, and (b) using Intel Default Settings (Performance for 13700K/14700K class, Extreme for 13900K/14900K class). Do this even if your PC seems fine — it prevents further damage.

Mitigation is not a cure. If a 13th/14th gen chip degraded before the microcode update, no setting recovers it — the fix is an RMA under Intel's extended warranty. If you see crashes or instability that the microcode update doesn't resolve, check your warranty. The CS2 Settings Optimizer flags this automatically when it detects a 13th/14th gen CPU.

What not to disable

C-States — keep them on (see above). Disabling them is outdated advice that lowers boost headroom.
Hyper-Threading — keep on for 13/14th gen. Disable only as a last-resort stutter fix, and patched microcode usually makes that unnecessary.
Virtualization (VT-x/VT-d) — leave enabled; it's required for Windows VBS and Secure Boot, and disabling it gives ~0% in real games.
E-cores — keep enabled on a patched BIOS. Disable only if you reproducibly see 15–20 ms CS2 frametime spikes on 12th/13th gen.

Bottom line

Enable XMP/EXPO, ReBAR (with Above 4G), Turbo and C-States, apply Intel Default Settings, and — if you're on 13th/14th gen — get on microcode 0x12F. Don't disable C-States, HT or virtualization for "performance." Let the Optimizer tell you which apply to your exact CPU, then pair it with the Windows setup and stuttering fixes.

FAQ

What BIOS settings improve FPS in CS2?

Enabling XMP/EXPO is the biggest single win (5–15% gaming FPS), followed by Resizable BAR with Above 4G Decoding, Turbo Boost, and keeping C-States enabled. Apply Intel Default Settings rather than a third-party baseline profile.

Does enabling XMP help in CS2?

Yes, significantly. Without XMP/EXPO your DDR5 runs at 4800 instead of its rated speed, and since CS2 is memory-sensitive, enabling it can add 5–15% FPS on its own.

What is microcode 0x12F and do I need it?

It is the current recommended Intel microcode mitigation for 13th/14th gen Raptor Lake degradation. If you own a 13th or 14th gen chip, update your BIOS to a version containing it and apply Intel Default Settings.

Should I disable E-cores for CS2?

Only as a last resort on 12th/13th gen, and only if you reproducibly see 15–20 ms frametime spikes. On a patched BIOS with microcode 0x12F, leaving E-cores enabled is correct for almost everyone.

Should I enable Resizable BAR for CS2?

Yes. Enable Above 4G Decoding first, then ReBAR. The average FPS gain is small, but many 13900K-class users report notably better 1% lows, especially when ReBAR is also forced for cs2.exe in NVIDIA Profile Inspector.