https://www.ebay.com/itm/GPU-Extender-SATA-Riser-Card-Mining-PCI-Express-USB-3-0-PCI-E-PCI-E-1x-to-6x/273102144306?hash=item3f96280332:g:pkAAAOSwav5aokzU
가격이 저렴하니까요.
GPU를 8개 정도 지원하는 모델등도 있습니다.
https://www.ebay.com/itm/8-PCI-E-Slots-Mining-Motherboard-CPU-SATA3-0-BTC-IC6S-For-Intel-DDR4-USB2-0/142770448278?rt=nc&_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D2%26asc%3D52935%26meid%3D1c06af70805047f5a6baebde5458b4ca%26pid%3D100005%26rk%3D2%26rkt%3D3%26mehot%3Dlo%26sd%3D292699221065%26itm%3D142770448278&_trksid=p2047675.c100005.m1851
마이닝용도 있습니다.
https://www.ebay.com/itm/NEW-8-GPU-Mining-Motherboard-8PCS-PCI-E-Extender-Riser-Card-For-Miners-BTC/152869450239?hash=item2397bab1ff%3Am%3AmktvewYuHTdkIEERWl5OAJQ&var=452619205184
가격이 받쳐주면
https://www.ebay.com/itm/Supermicro-X11DPG-QT-Server-Motherboard-Intel-Chipset-Socket-mbdx11dpgqtb/232874071519?epid=24007005715&hash=item36386055df:g:9kkAAOSwL7dbZZXx
https://www.ebay.com/itm/ASUS-ROG-ZENITH-EXTREME-X399-Desktop-Motherboard-802-11ad-Wi-Fi-DDR4-KZ/183378493823?hash=item2ab235c17f:g:dEMAAOSwFoNbcpgW
이런보드들도 괜찮습니다.
요즘의 PC의 경우 타워가 대부분 Micro-ATX급이라서
Graphics 카드를 많이 꽃을수 있는 모델은 많이 없을것 같아요.
http://www.ilovepc.co.kr/news/articleView.html?idxno=15286
그럼 즐거운 한주되세요.