There's tons of them with different names (780s, 980Tis, etc.) all over AliExpress and eBay. There has been also posts with these GPUs here in OCN (like a year ago or something).
Yes, as mentioned, those are 9800GTs and similar GPUs.
They usually have their BIOS modded to show different names and only "work" with the drivers that come with the CD included (since those are modded drivers too).
EDIT: From the newegg link:
"Up to 2GB of DDR3" - Not even 2GB probably
"Note: 1. Please unload the previous driver before installing our graphics card 2. Please install the optical disk driver from us" - Because official NVidia drivers probably crash/don't workEdited by gasparspeed - 6/20/16 at 8:43am