View Full Version : Agp 3.0?

07-22-04, 04:29 PM
I want to apologize if this has already been asked. I used the search tool but couldn't come up with any posts about AGP 3.0.

I just ordered my eVGA 6800 GT and after submitting, I saw that it requires AGP 3.0.

First off, I didn't even know there WAS an AGP 3.0. I looked at some pictures of Ti4400s (my current card) and it looks like part that goes into the AGP slot is the exact same length as the 6800's, however, where the 4400 has 3 sections, the 6800 only has 2 and it appears as though my Biostar M7NCD Pro will take either. But my question is: will? I'm worried... :confused:

07-22-04, 05:25 PM
agp 3.0 = agp 8x

07-22-04, 05:36 PM
agp 3.0 = agp 8x

Not always, i seem to remember my Epox-8rda+ was AGP 8x but CPU-Z would say AGP 2.0 @ 8x

07-22-04, 07:46 PM
Don't worry, it'll work.

07-23-04, 12:30 AM
Don't worry, it'll work.

heh, thanks...that's pretty much all I wanted to hear. :)

07-23-04, 02:13 AM
My motherboard is AGP 2.0 only and can only do 4x AGP speeds and the GT is working fine with it. No need to worry except for your dwindling bank account. :)

Son Goku
07-23-04, 03:15 AM
You might want to check this article out however...


What is AGP 3.0

AGP 3.0 is keyed like a 1.5V AGP 2.0 slot, but it only uses 0.8V of power. It supports 8X, 4X, 2X and 1X speeds.

...Signalling Voltage incompatibility

Because speeds must be backwards compatible, Signalling Voltage is where incompatibilities arise. Basically:

All 8x cards are 0.8v AGP 3.0 spec
8x cards will fit in 1.5V slots, and can tolerate the voltage, but will NOT run properly
4x cards can be either 1.5V or 0.8V
2x and 1x cards are either 3.3V or 1.5V
Except in the case of the 8X cards, using the wrong voltage card with the wrong motherboard can result in damage in card and board
If you install a card of incompatible voltages with the motherboard's specs, the card will NOT run

The connectors on AGP video cards are keyed in such a way that you can only install equipment that have compatible Voltage keyed connectors. Normally the key of the card determines its signal voltage. AGP 1.0 and AGP 2.0 cards using a 1.5V key will signal at 1.5 volts. However, AGP 3.0 devices can tolerate 1.5V - they won't be destroyed, they just might not work properly.

The Bottomline

The bottomline is that your 8X video card can theoretically be safely TESTED in any 1.5V motherboard for compatibility. But if you know for a fact that your board only runs 1.5V AGP 2.0 spec and your 8X AGP 3.0 card runs only 0.8v spec, then the two should NOT be compatible one another. At the very least it will be unstable, if it runs at all. However, we've had a lot of users tell us that their AGP 8x cards work on 4x only motherboards. This is likely due to the fact that some AGP8X video cards are in fact universal 1.5V capable AGP3.0 cards that can run on either 1.5V or 0.8V (remember, AGP speeds are backwards compatible, only voltage incompatibilies cause problems)...

07-27-04, 01:05 PM
All AGP cards are backwards compatible. I.E. your 8x AGP card will fit in a 4x AGP slot, but will only run at 4x speeds. Etc etc.