How do you guys know which memory brand a certain card has? Is it just luck or can we actually buy a card with the specific memory we want?

I'm an old time altcoin hobbyist, about to buy myself a new pc and I was thinking about getting a Sapphire 570 pulse 4gb because it's a reasonable gaming/mining card and I can get one for under 200€ but I'm afraid to get crap memories. Should I opt for a different model instead or are pulses (and their memories) decent for mining?

Thanks