Published August 19, 2026 - Updated August 19, 2026 - By Xilly
X3D Gaming Mode: Should You Enable It in BIOS?
X3D Gaming Mode can disable SMT, global C-states, and a second CCD. That can help selected games, but it is usually the wrong global setting.
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X3D Gaming Mode sounds like an obvious switch for a Ryzen gaming PC. On most systems, it should stay off. The preset can improve a narrow group of games, but it reaches that result by changing several CPU behaviors at once: disabling SMT, disabling global C-state control, and on a dual-CCD processor disabling the second CCD.
Leave X3D Gaming Mode off for most gaming PCs. If you need one of its benefits, change that setting directly instead of accepting the full preset. Dual-CCD owners should configure game scheduling with our Ryzen 9 X3D dual-CCD guide. Leave SMT enabled unless repeatable testing proves that one specific game performs and feels better without it.
What X3D Gaming Mode Actually Changes
Motherboard vendors may label the preset X3D Gaming Mode, Turbo Game Mode, or something similar. The exact menu and implementation can vary by BIOS, so review the settings summary shown by your board. The common idea is to make the processor look simpler to games by removing simultaneous threads, deeper idle behavior, and—in a dual-CCD design—the non-cache chiplet.
| Setting changed | What it does | Main tradeoff |
|---|---|---|
| SMT disabled | One thread is exposed per physical core | Some games lose smoothness or micro-stutter |
| Global C-State Control disabled | Prevents deeper CPU sleep states | Higher idle power and slightly more heat |
| CCD1 disabled on dual-CCD CPUs | Leaves the 3D V-Cache CCD active for games | Half the physical cores are unavailable |
Why X3D Gaming Mode Can Improve Some Games
Some game engines behave better when they see fewer cores, fewer logical threads, or one CCD. They may schedule important work more consistently and avoid moving threads between chiplets. On a dual-CCD X3D processor, removing CCD1 also guarantees that the game runs on CCD0, the V-Cache CCD.
That does not mean the preset is faster everywhere. It means the preset happens to match the needs of certain engines. A benchmark improvement in one title does not prove that SMT off and half the CPU disabled should become the permanent configuration for every game.
Why We Recommend Leaving It Off for Most People
X3D Gaming Mode bundles independent settings into one global switch. If performance improves, you do not know whether the useful change was CCD selection, C-state behavior, SMT, or a combination. If another game starts micro-stuttering, the preset gives you no clean way to identify which part caused it.
Compare 1% lows, frame-time consistency, input feel, and background responsiveness. SMT off can raise an average in one benchmark while making a real match feel less consistent. If the game does not respond well to the reduced thread count, micro-stutter is the warning sign.
SMT Off: The Biggest Reason to Be Careful
Simultaneous multithreading lets each physical core expose two logical threads. Disabling SMT does not double physical-core performance; it removes the second logical thread from every core. A few games can benefit from the simpler topology, but most modern games either gain nothing or use the extra scheduling capacity for worker threads and background tasks.
For roughly 90% of gaming setups, SMT should remain enabled. If you want to test it, benchmark one game at a time with an identical scene and settings. Re-enable SMT if frame times become less consistent, the game micro-stutters, or normal multitasking suffers.
Global C-State Control Off: What It Helps and What It Costs
Global C-state control allows the processor to enter deeper sleep states when parts of the CPU are idle. Disabling it keeps the CPU more awake. That can reduce wake-up latency slightly and can sometimes prevent idle crashes when a Curve Optimizer value is too aggressive at low voltage.
The tradeoff is higher idle power and a small increase in temperature because the processor cannot enter the same deep sleep states. Some CPUs also use the default C-state behavior to maintain better thermal headroom and boost behavior. If the processor already runs hot, disabling C-states is not a cooling fix and may make idle temperature worse.
If disabling global C-states stops idle crashes, the Curve Optimizer may still be too negative. The more robust fix is to move the unstable core or all-core value closer to zero and retest idle, light-load, and gaming stability.
CCD1 Off on a Dual-CCD X3D Processor
On Ryzen 9 dual-CCD X3D processors, the preset can disable CCD1 and leave CCD0—the 3D V-Cache CCD—active. That forces games onto the cache side, but it also removes the second chiplet from every workload until the setting is reversed. A 16-core processor effectively becomes an eight-core processor while that CCD is disabled.
You do not need to disable half the CPU just to keep a game on CCD0. AMD's automatic chipset-driver method can direct recognized games to the cache CCD, while Process Lasso can enforce CPU 0–15 for a specific game. Both approaches preserve CCD1 for streaming, Discord, browsers, recording, and productivity work.
Better Approach: Change Only the Setting You Need
| Your goal | Better approach |
|---|---|
| Keep games on the V-Cache CCD | Use AMD automatic scheduling or a per-game Process Lasso rule |
| Test whether C-states affect latency | Change Global C-State Control directly and compare |
| Stop Curve Optimizer idle crashes | Reduce the negative Curve Optimizer value first |
| Test a game that may prefer SMT off | Disable SMT temporarily and benchmark that game only |
| Keep streaming and background capacity | Leave CCD1 and SMT enabled |
How to Test X3D Gaming Mode Correctly
- Save the current BIOS configuration as a profile so you can return to a known baseline.
- Choose a repeatable in-game benchmark or the same CPU-bound scene.
- Record average FPS, 1% lows, frame-time behavior, CPU temperature, and idle power with the mode off.
- Enable X3D Gaming Mode, save, reboot, and repeat the exact same test more than once.
- Play a real match long enough to detect micro-stutter that a short benchmark may miss.
- Test at least one other game before deciding to leave a global BIOS preset enabled.
Recommendations by CPU Type
Final Verdict
X3D Gaming Mode is a troubleshooting preset, not a required optimization for every Ryzen X3D owner. It can work for selected games, but disabling SMT globally can cause micro-stutter, disabling CCD1 wastes the flexibility of a dual-CCD processor, and disabling C-states increases idle power and heat.
Leave the mode off by default. Route dual-CCD games to CCD0 with the dedicated scheduling methods, leave SMT on for most games, and change global C-state control directly only when you have a specific reason to test it.
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Frequently Asked Questions
Should I enable X3D Gaming Mode?
Usually no. Leave it off unless repeatable testing shows that a specific game improves in average FPS, 1% lows, and real gameplay without added micro-stutter.
What does X3D Gaming Mode disable?
Common implementations disable SMT and global C-state control. On dual-CCD Ryzen 9 X3D processors, the mode can also disable CCD1 so games remain on CCD0, the V-Cache CCD.
Can disabling SMT cause stuttering?
Yes. Some games and background workloads use the additional logical threads. If an engine dislikes SMT being disabled, frame times can become less consistent and micro-stutter can appear.
Should I disable global C-state control for gaming?
Only test it for a specific reason. It can slightly reduce wake-up latency and may stop idle crashes from an aggressive Curve Optimizer, but it increases idle power and heat and can affect boost behavior.
Does X3D Gaming Mode help the 9800X3D?
Usually not. The 9800X3D has one CPU CCD, so there is no second chiplet to disable. The remaining preset changes are SMT off and altered C-state behavior, which are not broadly beneficial.
How should a 9950X3D send games to the V-Cache CCD?
Use AMD's automatic chipset-driver, Game Mode, Game Bar, and Balanced-plan setup, or assign the game to CPU 0–15 with Process Lasso. Both preserve CCD1 for other work.