On SPI communication

I used the nRF52832  SDK15.0  S132,the question is:

(1) I used SPI_0_Instance for APP_SDCard  and SPI_1_Instance for other device;

The Setting of  SPI_1_Instance frequency is 8MHz, I can only set the SPI_0_Instance(APP_SDCard) frequency for 500KHz! If I  increase the frequency of SPI_0_Instance,the write function of APP_SDCard is not work,it will be crashed! But the frequency 500KHz is too low for me !

I  try to  reduce the frequency of SP1 to 1MHz, it's not work for SP0!

Who can help me ,thanks!