technically it depends on the card some will run higher or lower than 68 ( that's the default setting ) however as there's no factory unlocked 3070ti and 3080ti ( confirmed in the wild, rumours only ) the numbers are theoretical. most owners reporting it's still more profitable to mine ergo or rvn rather than unlocked lhr eth.
Seen that yesterday, but only unlocked to 68% potential.
And it's worth hurrying up, since a way has been found to bypass the LHR restrictions and such video cards will also soon be heavily used
https://www.scan.co.uk/products/radeon-rx6800-16gb-phantom-gaming-d-oc?gclid=CjwKCAjwmeiIBhA6EiwA-uaeFaFOfGAGxC-40dTvpfaAi6CaKNVQ9vuwISeTX9utJaaTlYl_1PU0-hoCF-EQAvD_BwE You can buy this new for £931 if you wanted, but i think an LHR nvidia would be more suitable to you ;) .
I got my rx580 for 140 quid from there year ago.still going strong,could be im just lucky (lol)