These are the specs of Memory Stick Pro Duo cards
:
- Transfer: 159 Mbit/s (20 MB/s)
- Minimum write speed: 15 Mbit/s
- Maximum write speed: 80 Mbit/s (High Speed PRO Duo)
I’m not sure if the PSP hardware can take full advantage of those speeds, but I think the ultra is faster than those already. So you aren’t likely to notice any improvement.