Maybe some day I'll find a 570/580 card with 2250 ram... but today is not the day. I've noticed the mfg. only put 2000 ram in all the 4gb cards, they save it all for the 8gb cards it seems??
I think none uses 2250 yet...RX570s and 4GB RX580s use 1750, and RX580/8GB use 2000