Hello making new custom system today set up all the bios settings i know and read in manual, memory runs in default sticker settings, no XMP profile enabled , intel turbo boost disabled , CPU clocks run default stock, memory is Corsair Vengeance 2x4GB DDR3 1600mhz 9-9-9-24 1.5v , 2 sticks are in channel 2 , channel 1 empty. Intel Core i5 3.3 MHZ sandy bridge somethign new to me is "Rank Interleaving" ... no idea about that but i read it's something similar to Channel interleaving for increasing performance so also web tells me it's good to enable it. All power saving and smart CPU "thermal/load auto-clock" options are disabled. I have a bit issue finding bios beeps for gigabyte's newest boards with their Award bios (which i prefer over AMI) One LONG beep at memory detectioin in first post screen, BOOT is OKAY, appears to work fine. no windows installed yet, bios updated to F5 from F1 , Crucial SSD M4 128GB updated to 0009 HDDs (not connected yet) 1x WD6400AALS (old sata2 caviar black) 1x WD5000AAKS (old sata2 caviar blue) I already did memtest and it passed 9 hours of 8 passes and i ... think i got something wrong , the memtest i have which is 4.2v and it appears it has a real issue detecting correct settings i may have to repeat the whole test. This is the memtest screen , the DRAM settings are shown totally wrong. 6-6-6-20 WTF ? The question is: is the overnight burn test valid ? - showed no errors The long beep is ONLY heard at startup from poweroff and NOT AT REBOOT. The long beep was not heard with F1 bios version. Note: F1 bios was not customized completely (no intrleaving, all other default, only ram settings and memtest) UPDATE: The bios has a normal short beep for OK , the LONG beep follows 1 second after when the POST screen is almost finished and it's a different tone, i still need to identify what the heck is this sound or from where it is... i will try disconnecting stuff like DVD drive , ssd and audio card or even gpu. Question: CPU PLL overvoltage ? why should this be enabled if i disabled Turbo boost ? What is CPU PLL anyways ? ------------------------------------------------------ Offtopic There is no way to completely disable GPU core ? , and imo what is this talk about "onboard VGA" ... since it appears it's taking 32MB memory "buffer size" from the main memory, i hope it's not taking that memory when disabled , it's "enable if no ext PEG" obviously i set but oh well.