# Cyberpunk 2077 Crash Case Solve

For note of one really weird crash solve case.

TL;DR:
- In my case, it is caused by RAM-memory-slot combination.
- Check your RAM, plug them one by one (if the capacity allows you doing so) to make sure RAMs are doing well individually.
- Try different combinations (across RAMs and memory slots plugged) to figure out is the problem caused by certain RAM-RAM, RAM-slot combination.
- Maybe Cyberpunk 2077 is good at exposing faulty hardware?

---

Configuration:
| Item | Description |
|-|-|
| CPU | Intel i5-11400 |
| MB | ASUS B560M-plus WiFi |
| Memory #1 | (Slot#1) Micron DDR4-3200, 16GB, `CT16G4DFRA32A.M16FR` (dual rank) |
| Memory #2 | (Slot#3) Micron DDR4-3200, 16GB, `CT16G4DFRA32A.C8FB` (single rank) |
| GPU | ASUS 6650XT 8GB @ PCIe Gen4 speed |
| OS | Windows 10, build 19045 |
| DirectX | 12 |
| GPU Driver | `23.9.2` Adrenalin version |
| Cyberpunk 2077 | 2.0 |

Memories are installed at slot #1 and #3 for dual channel.

Symptom:
- Can get into game title.
- Can get into game save selection.
- Get into recent save, graphics seems OK and no weird behavior.
- Do nothing or walk around for around **2** minutes, then one of these cases would happend:
- Game crashes and get you back to desktop, RED engine error reporter pops out.
- BSOD.
- In both case, you can observe the game (`REDlauncher.exe`) is terminated because of an "access violation", code `0xC0000005`.

Things tried beforehand:
- Update GPU driver to the latest version.
- or reinstall GPU driver by completely remove it first, you may use `DDU` (Driver Delete Utility) to remove GPU driver.
- Verify file integrity of game by Steam game file management interface.
- Doing some stress test on CPU and GPU to make sure they are not faulty, or at least behave well under high computation load.

Test configs:
| # | Memory #1 | Memory #2 | Result |
|-|-|-|-|
| 1 | slot #1 | slot #3 | FAIL (control group)
| 2 | slot #1 | - | SUCCESS |
| 3 | - | slot #3 | SUCCESS |
| 4 | slot #3 | slot #1 | SUCCESS |

Test step:
1. Put memory as test config specifies.
2. Boot into Windows.
3. Start Steam and launch Cyberpunk 2077.
4. Enter the game and pick any save.
5. Wait for around **2** minutes or walk around.
6. Should observe one of these cases:
1. Game crashes and get back to desktop.
2. BSOD.
7. If nothing happends, problem solve.

Summary:
- In my case, the error or instability could be caused by:
1. Mixing RAMs having different number of rank?
2. RAM may behave bad then plugged into certain slot?

---

References:
- https://www.reddit.com/r/cyberpunkgame/comments/xywd9i/game_keeps_crashing_even_though_it_runs_fine/
- https://www.reddit.com/r/microsoft/comments/14hbxjy/access_violation_c0000005_error_in_multiple/