Before opening the boxes?
buy from amazon they will let you return an open box
My place to buy allow it. I just don't want the hassle. I only want GPU with samsung memory.
Most reviews of specific gpu's will show the gpu-z screen grab and that will show you the memory. For example, the XFX RX480 Black Edition with reference cooler has Samsung vram. I know because I own 2. Might not be the best 480 for mining since Im getting a little below average h/s on zcash but I dont know how it will perform with other miners/coins