Thanx again for comments from Frank + others.
Here is a revised list of parts.
The probable list uses PCIe 4.0 , the alternative 3.0.
The former requires a graphix card, which adds  $ 300  to the total cost
(all prices in CAD).

Probable :

CPU : AMD : CPAMD00136 : Ryzen 7 : 5700X : 8-Core/16-Thread : $ 379
             7 nm ZEN 3 Processor : Socket AM4, 4.6 GHz boost, 36 MB Cache
             no graphix : PCIe 4.0

Mobo : MBGIG00145 : Gigabyte : X570 Aorus elite WIFI : $ 220
        dual PCIe 4.0 M.2 : Intel dual-band 802.11ac wireless
        front USB Type C : RGB Fusion 2.0

Graphix : VCMSI00255 : MSI : Radeon RX 6500 XT MECH 4G OC : $ 309
           18 Gbps , PCIE 4.0 , DP1.4 HDMI , RX 6500 XT Mech 2X 4G OC
  or      VCASU00335 : ASUS : Radeon RX 6500 XT OC : $ 299
           PCIe 4.0, 4 GB GDDR6, HDMI 2.1, DisplayPort 1.4a,
           Dual Ball Fan Bearings, All-aluminum Shroud, GPU Tweak II

Memory : MEKIT00523 : Kingston Fury Beast : 2 x 16 GB : DDR4 3200 MHz : $ 160

SSD : SSKIT00120 : Kingston KC3000 : 1 TB : PCIe Gen4 : NVMe M.2
       R 7000 MB/s ; W 6000 MB/s : $ 190

HDD : HDSEA00016 : Seagate IronWolf : 4 TB : CMR :
       SATA 6 Gb/s : 5900 RPM : 64 MB Cache : 3 Yr Warranty : $ 110

Case : CSDCL00015 : Deepcool D-Shield V2 ATX : Compact Mid Tower Case : $ 60
       CSDCL00019 : Deepcool E-Shield : Mid Tower Chassis,
        Black, Tempered Glass, 120mm Fan, Radiator Support,
        E-ATX/ATX/MicroATX/MiniITX : $ 60

Power : PSTHL00007 : Thermaltake Smart White : 700 W
         80 PLUS Certified Power Supply : $ 80

Total cost : $ 1508

Alternative :

CPU : CPAMD00131 : Ryzen 7 : 5700G : 8-core 16-thread : $ 388
       Socket AM4 : 3,8 / 4,6 GHz : PCIe 3.0 ; Radeon Graphix Wreath Stealth

No graphix card

SSD : SSKIT00103 : Kingston : NV1 : 2 TB : NVMe M.2 : $ 185
       Read: 2100 MB/s ; Write: 1700 MB/s

Total cost : $ 1203

Comment : I can afford the extra  $ 300  for the much greater speed of PCI 4.
There are  2  possible graphix cards, others being more costly :
any comments welcome ; I'm willing to consider Intel instead.

-- 
========================,,============================================
SUPPORT     ___________//___,   Philip Webb
ELECTRIC   /] [] [] [] [] []|   Cities Centre, University of Toronto
TRANSIT    `-O----------O---'   purslowatchassdotutorontodotca


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