Rx 6700 450 mhs Crazy high hashrate

So I have two specific cards when the miner initially starts up.(AMD/ATI 6700 xt Samsung(mem) Also (Powercolor 6700 xt) They both start upwards of 450+ mhs Mining ETH. Does not matter what software or crypto Im mining. Then after 2 minutes of it dropping slowly it stays steady at its normal 47 mhs range. Just curious if anyone else is experiencing this as well. Or if this is possible hope the bios could be cracked and tweaked to boost performance out of the 6700s? Or is this just a weird glitch that means absolutely nothing? i have 3 of each one as well, so I have 3 exact same powercolors 6700 xt and 3 AMD/ATI 6700 xt. Only 1 of each of them start up with extreme hashrates then drop slowly. I have over 30 cards in all and only 2 of them act this way. Silicon lottery winner???

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