Small world. Hear it from someone who have shopped at that exact store :
I know that seller (GASOL). He's quite reliable. I bought my current CPU cooler (Cryorig H7) and a completely unbranded RX 470 (turns out to be a "digital alliance" product) from the guy. Both purchases were legit parts. He's got a knack for sourcing weird, rare, and esoteric parts.
Here's the thing though, I try to stay away from weirdly branded parts, especially GPU. There's just too many GTX 5xx series cards being branded as anything from GTX 750 to 1050 out there. Trust me, I've been there, and it wasn't pretty.
Sure, there is a small chance that the 750 Ti is indeed 4GB, those people at Chinese "engineering sweatshops" could frankenstein almost anything when they're at it, but I won't take the risk. I'd look away and find something else, there are plenty of other choices in that price range
. You can snatch a used name-brand GTX 970 for around that price, and that's a lot better than this.... thing.
If you're limited by your PSU but you still need the 4GB VRAM, a bit of looking around could net you a used Gigabyte 1050Ti with 4GB VRAM, and that's better too.
That product reminds me of those chinese X79 motherboard whose chipset was sourced from harvested server motherboards or something. Those were the days.