For those not familiar with OpenBSD, it’s had an accelerated amdgpu driver since 2019, and inteldrm/radeondrm for a few years longer, generally kept up to date with Linux stable throughout that time.
Since many years longer, including the nv(4) driver for old Nvidia GPUs up to the earliest GTX models.
There is no kms drm or 3D acceleration for nvidia on OpenBSD.