Yeah, not sure if O/P is trolling or just April fool's joke or real.
But if real... then I have no other words here.
May still work if cut properly to a PCI-E 1x length, despite having been plugged into a regular PCI slot (the PCI-E lanes are capacitor-coupled, so any pin on the card going to a voltage rail on the PCI slot should not get damaged.) That said, I would be very surprised if the O/P's board didn't end up in smoke or with burned traces.
And to anyone ever trying to cut a PCI-E 16x GPU to fit into a PCI-E 1x slot, cut the 1x slot at the back so that 16x cards can fit rather than cutting cards individually. Of course, this will only work if there are no components behind the PCI-E 1x slot so that a 16x device will really fit.
Also, if you're ever going to cut a card for the 1st time, at least do it on something trashy and plentiful, like Radeon HD2400/3450/6450 which are dime-a-dozen and cheap enough to practice on. And preferably test it in a motherboard you don't care too much about, should anything go wrong. Just my $0.02's worth.