I have a Dell T7400, Windows XP Professional x64, Intel Xeon X5482 Quad Core @ 3.2 Ghz, 32 GB RAM @ 800 Mhz, Intel 5400 Chipset. The BIOS says the memory is 800 Mhz, but both Speccy and CPU-Z say the memory speed is 400 Mhz. Can anyone help me to explain the disparity?
DDR memory operating at 400MHZ is effectively 800MHZ memory because the memory is Double Data Rate. That's the normal way CPU-Z reports it. http://en.wikipedia.org/wiki/DDR_SDRAM
There's no discrpency. Your memory is operating as it should. You are getting 800MHZ worth of speed...