Is AGP 8X backward Compatible?

[pabeader]

I have an older AGP 2X Video card. Will I be abale to use it in a newer motherboard with an AGP 8X slot????


thanks for the help

 

[justly]

I wouldn't count on it being supported. The biggest reason for this is due to a signal voltage change between 2x and 4x. Most current motherboards only support the 4x/8x signal voltage.

 

[Schadenfroh]

If that is a 3.3V agp card, it will fry your 1.5V agp motherboard.

 

[Mathwiz]

If I understand this stuff correctly;

AGP 2X = 3.3 volt signal
AGP 4X = 1.5 volt signal
AGP 8X = 0.8 volt signal

A motherboard with a 2X slot will only use the 2X cards.
A motherboard with a 4X/8X slot will use either a 4X or 8X card.

The slots are physically different.

Some motherboards with a 4X/8X slot will only support AGP 4X. With the newer
8X cards, you need something like coolbits or Rivatuner to specify 4X in the settings
to be able to use a 8X card in those boards.

There may be some sort of auto detection on the cards concerning voltage, but if it is
I'm not aware of it.

Hope this helps