Some really early model G400 only supported 2X (3.3V).

Can you read off the full model ID number ?

"JF" wrote in message
news:hdgZb.3251$4K3.192@fed1read06...
I'm looking at upgrading mainboards and the one i'm looking at says 1.5v
video card only. I'm pretty sure the G400 is 1.5, but can't remember.
The m/b is a ASUS P4B533.
thanks