The GeForce MX450 is a new low-end discrete video card for the laptop market. NVIDIA says the GeForce MX450 offers GDDR5 and GDDR6 memory support but other than that there are no technical specifications. According to earlier leaks, the MX450 uses the TU117 "Turing" GPU and has up to 896 CUDA cores.
We should see it soon in Intel Tiger Lake based laptops.