AGP 4x is not a primitive slot. It's only one step behind the very latest, and many new motherboards still use AGP 4x slots.
Yes - you can fit an AGP8x card into an AGP4x slot - and I bet you couldn't even tell the difference!
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Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.