hi all,

anyone can determine positionof my bios chip plz

thx all

is it the bios ?



I found out that the GigaDevice 25LB128 BIOS chip found on my Crosshair VI Extreme, and the similar 25LQ128 are NOT equivalent to the Windbond W25Q128 BIOS chips. The W25Q128 uses a VCC range from 2.7V to 3.6V. The 25LQ128 data sheet designates VCC=1.8V. Elmor did state that the AM4 boards use VCC=1.8V for the BIOS chips. So if you program the BIOS chip 25LB128 on an AMD board such as the C6E, you must use VCC=1.8V to avoid damaging the chip. Also program it with the board powered down.

Here is a chart from the GigaDevice product selection guide that shows the VCC input voltages for SPI chips. Note that "Q" denotes 3V while "LB" and "LQ" denote 1.8V

Click image for larger version.

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My GQ4x4 SPI programmer supplies 5V, but they provide an adapter for reducing that VCC down to your choice of 1.8V or 2.4V.