Anyone who has been around in PC gaming for a long time will know that every time a new high-end graphics card gets launched, supply is never enough to meet demand.
In the case of the GeForce RTX 5090, board partner MSI says that its cards will have limited availability and it's down to an insufficient number of GB202 GPUs from Nvidia.
While this news probably isn't a shock to any graphics card enthusiast, it's worth noting that this isn't some rumour or leak—it's an official statement by MSI, one of Nvidia's key GPU partners, as reported by IT Home (via Wccftech).
As with any manufactured product, the overall availability can only be as good as the weakest link in the supply chain. In this instance, according to MSI, it's the number of GPUs being provided by Nvidia.
MSI, Asus, Gigabyte, and all other AIB vendors purchase graphics processors from Nvidia, which then distributes them mostly from its centres in Hong Kong.