GA-A75M-D2H disables onboard VGA with 6450 GFX card

[nedge2k]

Bought the GA-A75M-D2H to run two monitors then had a need to run three so bought a 6450 gfx card to crossfire with the A8-3850 APU - although in order to use onboard and pci gfx ports, the crossfire is disabled in CCC.

The monitors are 2xVGA and 1x DVI.

Problem is, no matter how I set things up in the BIOS, it refuses to output via the onboard VGA/D-SUB with the gfx card installed but will output on the onboard DVI. Is there something I'm missing?

The gfx card is, like the motherboard, DVI-D and has no displayport (none of the 6450 cards seem to) so I need to be able to use both the VGA/D-SUB on the mobo and the card to run the monitors I have. Buying a displayport card or a new monitor is out of the question and a powered VGA splitter is not suitable as the two VGA monitors are different aspect ratios.

BIOS: ver. F5, all drivers up to date etc. etc.
CPU: AMD A8-3850
GFX: Asus EAH6450
RAM: Corsair 8GB (2X4GB) DDR3 1866Mhz Red Vengeance (on the supported list)
PSU: 430w corsair
Other: TP-Link PCI-E Wi-Fi, PCI dual serial, WB Sata III HDD, USB3.0 card reader (connected to mobo header), Sata DVD-RW

Help!

[Dark Mantis]

If you are trying to use three monitors in Eyefinity mode then you are out of luck as a Display Port is essential. To run Crossfire both cards must be the same anyway or at least the same series.

[nedge2k]

I think you've missed the point here.

I am not trying to use Eyefinity as none of the 6450 card have  displayport - I knew that when I bought it.

I am trying to run 2xVGA/D-Sub and 1xDVI from a combination of the onboard and PCI-E graphics but it is not working.

If I wanted to run 2xDVI and 1xVGA/D-SUB it would work.

My question is why will the mobo only output on DVI with a PCI-E gfx card installed and not VGA/D-SUB also? Without the PCI-E card it will output on both at the same time. With the card installed, VGA/D-SUB gets disabled but DVI works.

This must be a bug in the BIOS because other motherboards support this and it is not mentioned in the manual that VGA would be disabled if a PCI-E card was installed.

Is there someone technical you could refer this to?

[Dark Mantis]

GGTS is available here:

GGTS   http://ggts.gigabyte.com/

http://uk.gigabyte.com/support-downloads/support-downloads.aspx

Please expect several days for a reply.

[nedge2k]

yeah its been a few days already - i really need an answer on this or i have to send the gfx card back and sort something else out.

this should just work, i don't understand why they would only allow onboard dvi and not vga also when a pci-e card is installed.

asrock have an faq about it: http://www.asrock.com/support/qa/TSDQA-88.pdf

[Dark Mantis]

Are you using an adapter on the problematic port ?

[nedge2k]

nope, straight vga-to-vga.

(...and yes the itself monitor works fine, as tested on the pci-e vga port)

I don't know if you have some way of contacting the ggts people directly but if you do, could you give them a poke? the question number is 1210250

[Dark Mantis]

I will contact them, but that isn't to say that they will take any more notice of me that they are of you. Still it never hurts to try. I will post if I hear anything back.

[nedge2k]

cheers dude

[nedge2k]

To update this:

After a lot of back and forth with GGTS, it turns out the Asus graphics card was at fault. I replaced it with another 6450 card (Gigabyte GV-R645OC-1GI) and it all worked straight away.

So the lesson here is, always by your mobo and gfx from the same manufacturer