If you can buy it at a store, then go down there and if there is no shrink-wrap, they might let you open the box and inspect the memory. If there is no heatsinks on the memory chips you can easily spot which type of memory it uses. If there is heatsinks then its impossible and you need to plug it into a computer. No computer shop will let you do this unless you buy it because the GPU becomes used and they will have issues selling it.
Some shops even with no shrink-wrap will not open the box, because the electrostatic bag inside might have a tape/sticker and they don't want to remove it because it will make the GPU seem used.
now which 2 gpu you think is best hashrate ?
i not want buy 570 8gb again
confused which AMD gpu now have free almost 900w of 1200w using 275w to 300w so have free 900w free of my psu
now 85 mh/s 3 gpu
need more 2 gpu idk which buy