Why Panel Modding Your Zephyrus Won't Improve Temps
Hi all,
I'm seeing some threads on people panel modding their Zephyrus G14 and G16 laptops to use the 2026 bottom panel, believing it improves air flow and lowers temps. I'm here to dispute some facts regarding the design change.
To find out the air flow efficacy of each panel, we'll have to account for the different variables involved. Airflow is determined by both OAR (Open Area Ratio), Hydraulic Diameter, and Flow Resistance Coefficient.
OAR:
The slits on the 2025 panel actually have a significantly higher OAR of ~45% vs ~25% on the 2026 panel. This is a nearly 80% decrease of OAR on the 2026 panel.
This was calculated by the surface area of the vents of the given area, as well as estimating the diameter of each hole in proportion to the surrounding area of the panel.
Hydraulic Diameter:
By design, slits actually have a significantly larger Hydraulic Diameter than Micro-Holes. Micro-Holes create high wall friction which leads to flow contraction, reducing intake volume.
Flow Resistance Coefficient:
The combination of the higher OAR of the 2025 panel as well as the larger Hydraulic Diameter leads to a lower Flow Resistance Coefficient than the 2026 panel.
WHY THE DESIGN CHANGE?:
As many reviewers have pointed out, the bottom panel of the 2026 model feels significantly more rigid than the 2025 model. This is a biproduct of the micro-hole design which has higher torsional rigidity than a panel with slits.
Micro-holes also alter the sound profile by reducing the high pitch whistle that may be present from the intake of a slit panel. This may result in lower perceived noise (although not really reported).
WHAT ABOUT THE LOWER TEMPS?:
The 2026 models undeniably run cooler than the 2025 models. But this is not from improved airflow from the bottom panel but rather other design changes.
Both the G14 and G16 have larger exhaust openings, which contributes to the slight increase in thickness, but improves airflow and heat dissipation.
These new models also use Intel's new 386H chip. While performance is somewhat negligible against last year's model, the 386H is significantly more power efficient, being able to run 10-15w less than its predecessor while performing similarly under gaming loads. This allows for more thermal headroom for the GPU instead, allowing Asus to give it a higher TGP.
Reviewers have also noted that the 2026 models actually run noticeably louder (+5dB) under max loads. Ramping the fans faster and harder will obviously increase airflow and lower temps. Under these high noise levels, the GPUs actually already ran decently cool in the 2025 model, with some headroom to spare.
DISCLAIMER:
I am by no means a subject matter expert on fluid dynamics. I just happened to come across these mod threads, and have too much time on hand and decided to spend hours researching if there actually was any tangible benefit.
I am also aware that most of the vents are already taped over, exposing only a small area (furthermore reducing any real world difference).
And no, this post was not written with AI.
TL;DR:
2026 panel actually has less airflow, temp improvements were from other design changes. Don't waste your time and money.