fix(guidelines): update bits and bytes guidance

Author: RoRoJ

pages/guidelines.mdx

@@ -378,17 +378,23 @@ Use the [Oxford comma](https://en.wikipedia.org/wiki/Serial_comma) (also known a
 
 ### Bits and bytes
 
-- Add a space between the bits/bytes abbreviation and the number, e.g. `100 MB`, `1 Gbps`
+- Add a space between the bits/bytes abbreviation and the number, e.g. `100 MB`, `1 Gbps`.
 - Use the following abbreviations:
 
-| Term                  | Abbreviation      | Example                                  |
-| --------------------- | ------------------|----------------------------------------- |
-| megabyte              | MB                | Memory: 100 MB                           |
-| gigabyte              | MB                | Memory: 1 GB                             |
-| gigabit              | none              | Connectivity; up to 10 gigabit           |
-| gigabits per second   | Gbps              | Bandwidth: 1 Gbps                        |
-| megabits per second   | Mbps              | Bandwidth: 100 Mbps                      |
-| gigabit-seconds       | GB-s              | Storage: 1 GB-s                          |
+| Abbreviation     | Unit                           | Used for                                   |  Example                             |
+|------------------|--------------------------------|--------------------------------------------|--------------------------------------|
+| MB, GB, TB       | Megabyte / Gigabyte / Terabyte | Storage capacity, RAM, VRAM, disk size     | Storage: 32 GB           |
+| MiB, GiB, TiB    | Mebibyte / Gibibyte / Tebibyte | RAM / memory in binary multiples where technical precision is important  | RAM: 512 MiB  |
+| Mbps, Gbps       | Megabit per second / Gigabit per second | Network bandwidth (bits per second) | Bandwidth: up to 10 Gbps          |
+| MB-s, GB-s       | Megabyte seconds / Gigabyte seconds | Cumulative data transfer/consumption over time | Memory consumption: €0.10 per 100 000 GB-s |
+
+<Message type="note">
+GB vs GiB is an SI vs binary distinction:
+- GB = 10⁹ bytes = 1,000,000,000 bytes 
+- GiB = 2³⁰ bytes = 1,073,741,824 bytes
+<br/><br/>
+Use GiB/MiB for memory in contexts where technical precision and binary vs decimal distinction is critical. In other contexts, GB/MB may be appropriate for memory.
+</Message>
 
 ## Wording and vocabulary