docs(ubuntu-gb10): clarify desktop memory footprint

- clarify memory table states before model load
- call out desktop and app footprint avoided by minimized Server
- align decision bullet with measured desktop footprint

Author: timothystewart6

_posts/2026-06-22-ubuntu-gb10.md

@@ -44,13 +44,14 @@ DGX OS is not bad. For a first-time GX10 owner, it is the lowest-friction path t
 
 The reasons I moved away from it:
 
-**Memory footprint.** DGX OS ships with a full GNOME desktop. On a machine where the CPU and GPU share the same physical memory, that desktop costs you model capacity. Measured on identical GX10 units:
+**Memory footprint.** DGX OS ships with a full GNOME desktop. On a machine where the CPU and GPU share the same physical memory, that desktop costs you model capacity. Measured on identical GX10 units before loading a model, with the final row showing the practical desktop footprint avoided by the minimized Server path:
 
-| Configuration | RAM used at idle | Available for models |
+| System state | Memory impact before model load | Available for models |
 |---|---|---|
-| DGX OS 7 + GNOME (idle) | ~4.7 GiB | ~116 GiB |
-| DGX OS 7 + GNOME (apps open) | ~5.8 GiB | ~115 GiB |
-| **Ubuntu Server 24.04 minimized (this guide)** | **~2.9 GiB** | **~118 GiB** |
+| DGX OS 7 with GNOME idle | ~4.7 GiB | ~116 GiB |
+| DGX OS 7 used as a desktop, with normal apps open | ~5.8 GiB | ~115 GiB |
+| **Ubuntu Server 24.04 minimized, with no desktop session** | **~2.9 GiB** | **~118 GiB** |
+| **Desktop/app footprint avoided by the minimized Server path** | **Up to ~5.8 GiB of GNOME and desktop-app usage is not present** | **~118 GiB available after the minimized Server base OS is running** |
 
 Xorg plus gnome-shell plus gnome-remote-desktop pulls about 340 MB of the shared GPU memory on its own, before you start doing any AI work.
 
@@ -93,7 +94,7 @@ If you just bought a GX10 or DGX Spark and want the path of least resistance, DG
 
 I would use this path when you want:
 
-- To reclaim roughly 3-6 GiB of RAM otherwise spent on the desktop stack, based on the GNOME idle and apps-open measurements above
+- To avoid up to ~5.8 GiB of GNOME and desktop-app memory footprint before your model starts
 - No desktop environment consuming GPU memory on a machine built to run LLMs
 - Fewer installed packages, which means less patching, less bloat, and less attack surface
 - Control over update cadence - driver and kernel upgrades on your schedule