Graphics card for UP1500, AGP Compatibility and Signalling Voltages

[Matt Turner]

Hi,

One follow up question: Is the UP1500 a full ATX board or a MicroATX
board? It only has 4 expansion slots, but it looks a bit larger than
MicroATX.

Thanks,

Matt Turner

On Thu, Nov 27, 2008 at 12:22 AM, Matt Turner <mattst88 at gmail.com> wrote:
> Hi,
>
> I'm attempting to determine what graphics cards are compatible with
> the Samsung UP1500 motherboard.
>
> It uses the AMD-761 chipset, which according to both the UP1500 user
> manual and this Wikipedia article
> (http://en.wikipedia.org/wiki/Comparison_of_AMD_chipsets) supports AGP
> 4x.
>
> AGP 4x is defined as using 1.5v signalling voltages, whereas older
> 1x/2x AGP used 3.3v. To prevent you from frying your card, AGP slots
> are keyed. See http://en.wikipedia.org/wiki/AGP#Compatibility
>
> Now, if you look at the picture of a UP1500 motherboard
> (http://alphalinux.org/wiki/index.php/Image:UP1500.jpg), it clearly
> has the 3.3v key. This limits the available cards to Radeons through
> the R300 series. I'd really like an AtomBIOS-enabled R500 to be able
> to go straight from the blue backgrounded SRM console to a nice kernel
> modesetting environment, but without the correct AGP keys, this can't
> happen.
>
> What's going on? AGP 4x is supported by the board, but not the
> appropriate signalling voltages?
>
> Otherwise, does anyone know of an AGP R500 card with the appropriate 3.3v key?
>
> Matt Turner
>