My STM32F103C8T6 board has a 4 MHz external oscillator. When I run the following RCC configuration code the second call to the RCC_GetClocksFreq() routine reports a SYSCLK, HCLK and PCLK2 clock speed of 112 MHz and a PCLK1 speed of 56 MHz. If I change the PLLSource to RCC_PLLSource_HSE_Div2, then the clock frequencies are halved, as you would expect. The device specifications say the maximum clock speed is 72 HMz, but I'm sure it could go a little further; whether it can go all the way to 112 MHz, I don't know. Is the clock actually being set to 112 MHz or is the reported value being multiplied by 2? Either way, something is wrong. Any suggestions? Could it be something in the compiler?

void RCC_Configuration(void)
{
RCC_ClocksTypeDef RCC_Clocks;
ErrorStatus HSEStartUpStatus;

/* Get the frequencies of different on-chip clocks */
/* At this point all clocks 8 MHz except ADC clock = 4 MHz *? */
RCC_GetClocksFreq(&RCC_Clocks);

/* RCC system reset(for debug purpose) -------------------------------------*/
RCC_DeInit();

/* Enable HSE --------------------------------------------------------------*/
RCC_HSEConfig(RCC_HSE_ON);

/* Wait till HSE is ready --------------------------------------------------*/
HSEStartUpStatus = RCC_WaitForHSEStartUp();

if(HSEStartUpStatus == SUCCESS)
{
/* Enable Prefetch Buffer */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

/* Flash 2 wait state */
FLASH_SetLatency(FLASH_Latency_2);

/* HCLK = SYSCLK */
RCC_HCLKConfig(RCC_SYSCLK_Div1);

/* PCLK2 = HCLK */
RCC_PCLK2Config(RCC_HCLK_Div1);

/* PCLK1 = HCLK/2 */
RCC_PCLK1Config(RCC_HCLK_Div2);

/* PLLCLK = 4MHz * 14 = 56 MHz */
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_14);

/* Enable PLL */
RCC_PLLCmd(ENABLE);

/* Wait till PLL is ready */
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
{
}

/* Select PLL as system clock source */
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

/* Wait till PLL is used as system clock source, SWS_PLL = 0x80 */
while(RCC_GetSYSCLKSource() != SWS_PLL)
{
RCC_GetClocksFreq(&RCC_Clocks);
}
}
else
{
// Alternative source
}

/* Get the frequencies of different on-chip clocks */
RCC_GetClocksFreq(&RCC_Clocks);

}