MAX10 EPE M9K Fmax limit?

Hi,

I try to use EPE on MAX10. I generate accuTrack_early_pwr.csv file.

My design have some dual port block ram running at 320MHz:

BLOCK,M9K,count,1,ram_mode,"Simple Dual Port",ram_read_during_write,"new",ram_porta_fmax,"80",ram_porta_data_width,"36",ram_porta_addr_width,"2",ram_porta_depth,"4",ram_porta_ena_static_prob,"0.500000",ram_porta_write_ena_static_prob,"0.500000",ram_porta_read_ena_static_prob,"0.000000",avg_ram_porta_output_toggle_ratio,"0.000000",ram_portb_fmax,"320",ram_portb_data_width,"36",ram_portb_addr_width,"2",ram_portb_ena_static_prob,"1.000000",ram_portb_write_ena_static_prob,"0.000000",ram_portb_read_ena_static_prob,"0.500000",avg_ram_portb_output_toggle_ratio,"0.125000"

Import macro generate an error with a limitation at 260MHz :

1 errors encountered!
Line 37: Invalid clock freq on port B!
Cell value must be between 0.0 and 260.0
Skipping!

If in my design a change PLL frequency, import works fine. But I would like to use real frequency : 320MHz.

I don't understand where come from this 260MHz limitation. Is it related to this Table 31 of the datasheet?

If yes, there where no warning message about that into Quartus compiling flow.
Thanks for your help and advice.