New pc for my nephew Christmas present

It's actually not unreasonable.

The 3080 goes used for around $500, with some OEM ones going for as low as $450:
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2334524.m570.l1313&_nkw=rtx+3080+-ti+-asus+-intel+-amd+-evga&_sacat=0&LH_TitleDesc=0&_udlo=&Memory%2520Size=10%2520GB&LH_Auction=1&rt=nc&_salic=1&LH_PrefLoc=1&_ipg=60&LH_Complete=1&LH_ItemCondition=3000&LH_Sold=1&_in_kw=1&_dmd=1&_sargn=-1%26saslc%3D1&_stpos=95377&_odkw=rtx+3080&_osacat=0&_samilow=&_dcat=27386&_sop=12&_ex_kw=&_samihi=&_udhi=

The 5800x goes for around $205 used.

Add that together it's around $650-$700. Deduct that from 1079 and you get $380-$430 - about the price of the rest of the stuff new:

Even then A520 has 50% more PCIe bandwidth than X470 and this is a 2TB hard drive instead of an archaic 1.5TB.

PCPartPicker Part List

Type Item Price
Motherboard MSI A520M-A PRO Micro ATX AM4 Motherboard $59.99 @ Newegg
Storage TEAMGROUP MP33 1 TB M.2-2280 PCIe 3.0 X4 NVME Solid State Drive $55.99 @ Newegg
Storage Western Digital AV-GP 2 TB 3.5" 5400 RPM Internal Hard Drive $35.99 @ Amazon
Case Lian Li PC-O11 Dynamic ATX Full Tower Case $149.99 @ Adorama
Power Supply Gigabyte AORUS P GM 850 W 80+ Gold Certified Fully Modular ATX Power Supply $77.23 @ Amazon
Total $379.19
/r/buildapc Thread