Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the sum of Mpix with a maximum fps HDRX of less than 12 with a width larger than 5120?

### Inputs:
table_name: table, columns: ['Frame size', 'Width', 'Height', 'Mpix', 'Aspect Ratio', 'Maximum fps', 'Maximum fps HDRx', 'least compression at 24 fps', 'least compression at maximum fps']

### Response:
SELECT SUM Mpix FROM table WHERE Maximum fps HDRx < 12 AND Width > 5120