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Setting SPI1 freq for SD card = 24Mhz

Question asked by A2 on Jun 17, 2013
Latest reply on Jun 17, 2013 by Clive One
I am using STM32F205 with 120Mhz interanl PLL(HSI).

I have to interface SD Card on SPI with <= 24Mhz. 
Problem is with 120Mhz sysclk I can only obtain SPI-30Mhz(can't use of SD), 15Mhz(too slow)
and other lower freq.

Now there is trade-off b/w SPI freq & SYSCLK. The best settings I can think is SYSCLK = 96Mhz & SPI = 24Mhz . 
Can anyone give better solution or any solution in which I don't have to sacrifice SYSCLK freq.