drm confusion / xorg / AMD RX580 GPU

Hi,

context: 12-alpha8, amd64, xorg, AMD rx580 card

As per /usr/ports/UPDATING, I have installed graphics/drm-kmod which has
installed drm-next-kmod-4.11.g20180822

As per pkg message, it's loaded with this line in /etc/rc.conf:

kld_list="amdgpu"

But even though I get a graphical display, this shows in the X.org.0.log:

[    91.379] (II) LoadModule: "ati"
[    91.379] (II) Loading /usr/local/lib/xorg/modules/drivers/ati_drv.so
[    91.379] (II) Module ati: vendor="X.Org Foundation"
[    91.379]    compiled for 1.18.4, module version = 18.1.0
[    91.379]    Module class: X.Org Video Driver
[    91.379]    ABI class: X.Org Video Driver, version 20.0
[    91.382] (II) LoadModule: "amdgpu"
[    91.383] (WW) Warning, couldn't open module amdgpu
[    91.383] (II) UnloadModule: "amdgpu"
[    91.383] (II) Unloading amdgpu
[    91.383] (EE) Failed to load module "amdgpu" (module does not exist, 0)

$ kldstat
Id Refs Address                Size Name
 1   86 0xffffffff80200000  13341b0 kernel
 2    1 0xffffffff81536000   3ace18 zfs.ko
 3    2 0xffffffff818e3000     a500 opensolaris.ko
 4    1 0xffffffff81a22000   159978 amdgpu.ko
 5    1 0xffffffff81b7c000    75d70 drm.ko
 6    4 0xffffffff81bf2000    10570 linuxkpi.ko
 7    3 0xffffffff81c03000    11300 linuxkpi_gplv2.ko
 8    2 0xffffffff81c15000      6c0 debugfs.ko
 9    1 0xffffffff81c16000     80db amdgpu_polaris10_mc_bin.ko
10    1 0xffffffff81c1f000     441d amdgpu_polaris10_pfp_bin.ko
11    1 0xffffffff81c24000     441b amdgpu_polaris10_me_bin.ko
12    1 0xffffffff81c29000     241b amdgpu_polaris10_ce_bin.ko
13    1 0xffffffff81c2c000     5d3d amdgpu_polaris10_rlc_bin.ko
14    1 0xffffffff81c32000    4042d amdgpu_polaris10_mec_bin.ko
15    1 0xffffffff81c73000    4042f amdgpu_polaris10_mec2_bin.ko
16    1 0xffffffff81cb4000     331f amdgpu_polaris10_sdma_bin.ko
17    1 0xffffffff81cb8000     3321 amdgpu_polaris10_sdma1_bin.ko
18    1 0xffffffff81cbc000    5bbfd amdgpu_polaris10_uvd_bin.ko
19    1 0xffffffff81d18000    28d1d amdgpu_polaris10_vce_bin.ko
20    1 0xffffffff81d41000    1fe51 amdgpu_polaris10_k_smc_bin.ko
21    1 0xffffffff81d61000     1800 uhid.ko
22    1 0xffffffff81d63000     2368 ums.ko
23    1 0xffffffff81d66000    399d8 linux.ko
24    2 0xffffffff81da0000     2d98 linux_common.ko
25    1 0xffffffff81da3000    34008 linux64.ko

Need to know:

1. is this the right/fastest/best driver for this card?

2. how can I tell if it's using all its capability?

3. I'd like this card to crunch with boinc. What determines if this is
possible? is it freebsd, boinc, the card driver, the project boinc is on
or something else?

thanks,
-- 
J.