Flashing Sapphire RX580 Bios - Timing Table Problem

Hi there, am a new miner and have successfully setup my new rig. For a non-IT guy it was a little scary but got there in the end and have a whole lot of new skills!!

Having successfully flashed the bios in my Strix RX580 cards I thought I'd give the sapphire nitro+ 8gb a go. However, I have encountered an issue with the memory timing table - I can't figure it out. The Mhz increments are not the 'usual' - please see below. If anyone has seen this before can you please advise how best to change the memory clock on these.



Thanks
Rob