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SCAR 18 G834JY oddities and issues including stuttering and hiccups

hexaae
Level 13

Got a brand new SCAR 18 G834JY BIOS 328, 32GB 5600MHz, 4090 16GB, internal 18" monitor 2560x1600 16:10 G-Sync.

Problems and oddities I encountered 'till now (will keep it up to date):

1. in Ultimate mode (dGPU only) the iGPU seems still active (???) Expected: iGPU should be completely unavailable, instead it's still listed under Device Manager, HWiNFO, GPU-Z and maybe is involved in presenting frame buffers to screen (!?!?) 

2. 💣 strange stuttering, especially with DX9-10-11 games. Reported by many users. Modern demanding games (e.g. A Plague Tale: Requiem) run fine without hitches or stuttering. The problem is with older games and bad performance with stutterings and micro-lags, even when using 2D games only or emulators like MAME.
G-Sync should always grant perfect smoothness but doesn't seem to work as expected, and/or DX9-10-11 games just stutter a lot, even DOOM3 when strafing left-right shows lags and hitches at 120 or 240Hz (download the mp4 file and play it locally because online play lags too much)! They run perfectly smooth on my old GL703GS 1070 8GB + G-Sync internal monitor.
Hope it's not related to 1st point... but this could explain why many users report stuttering and non-smooth gameplay on this beast of a laptop. ASUS BIOS issue or what?

3. even in dGPU mode only I can't create custom resolutions in NVidia driver panel (Resolutions section): the button "Customize" is ghosted. This way I can't add special screen modes e.g. 90Hz...

4. some games start with very low audio, but if you press Vol Up/Dow buttons, audio will change completely and be re-leveled... (??) Seems has been fixed with latest Dolby update.

5. the laptop at default screen settings (2560x1600 at 240Hz) in dGPU-only, won't pass UFO Ghosting test with error: "Sync failure. Unable to VSYNC. Try closing all apps and browser tabs." and the strange thing is that if you change it to 120Hz from Windows 11 settings, it will finally pass the test! (??)

// ASUS SCAR18 G834JY, i9-13980HX, 4090 256bit 16GB, 32GB 5600MHz RAM, 18" 16:10 2560x1600 240Hz G-Sync internal screen, external UWQHD 3440x1440 Mi 34" Monitor with Freesync, NVMe, 8BitDo Arcade Stick, EasySMX X10 controller, ROG Strix Carry mouse.
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hexaae
Level 13

This seems a common issue for 4080-4090 mobile users:

https://www.reddit.com/r/LenovoLegion/comments/18pvt49/mobile_rtx_40_series_are_known_to_produce_hic...

4080 mobile users. How's the micro stutter? : r/GamingLaptops (reddit.com)

We need more updates from ASUS/NVidia to solve these strange stutters in old games? 😞

// ASUS SCAR18 G834JY, i9-13980HX, 4090 256bit 16GB, 32GB 5600MHz RAM, 18" 16:10 2560x1600 240Hz G-Sync internal screen, external UWQHD 3440x1440 Mi 34" Monitor with Freesync, NVMe, 8BitDo Arcade Stick, EasySMX X10 controller, ROG Strix Carry mouse.

hexaae
Level 13

More about these 4080/90 laptop GPUs hitches/hiccups problems:

Avoid RTX 4000 mobile gaming laptops, for now. : r/GamingLaptops (reddit.com)

// ASUS SCAR18 G834JY, i9-13980HX, 4090 256bit 16GB, 32GB 5600MHz RAM, 18" 16:10 2560x1600 240Hz G-Sync internal screen, external UWQHD 3440x1440 Mi 34" Monitor with Freesync, NVMe, 8BitDo Arcade Stick, EasySMX X10 controller, ROG Strix Carry mouse.