If the model number includes "4A" then it's 4X AGP (3.3 or 1.5V).

Rick

"Tod" wrote in message news:VYhZb.19616$Xp.96082@attbi_s54...
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