So, my friend has a PC and he has AMD Radeon hd 7400, but when i google that, all that comes out is "AMD Radeon hd 7400M" with the M on it. I checked everything on his computer, but everywhere it says "AMD Radeon HD 7400 series".
Wikipedia, which is NEVER wrong lol, shows the 7400 series as OEM. So they were not sold to the public individually which is why there isn't a lot on them. Two models are listed, 7450 and 7470, with the main difference being that the 7470 was available in a DDR5 model. They are 64 bit GPUs, so don't expect much performance, especially from the DDR3 models.