Yes, it still matters, but mostly not for final RAW image quality. RAW preserves the sensor data for later processing, so the camera’s processor usually does not determine how good the final edited RAW file can look. However, the processor is still heavily involved in shooting RAW: it helps manage burst rate and buffer clearing, writes EXIF metadata, generates the embedded preview/thumbnail used for playback and histograms, and handles camera functions such as autofocus, metering, and communication with the lens. Some camera features may also affect RAW files or their metadata, such as certain ISO handling or highlight-priority modes, and some corrections can be applied or recorded. So if you only care about final image quality from RAW, processor upgrades are usually not a big factor. If you care about shooting speed, responsiveness, review/playback, AF performance, and buffer performance, then the processor can matter a lot.