How many graphics cards does windows support?

[thisway]

Hey,

my setup has 5 cards. 4 are working just fine, but the 5th is showing an warning sign and says "Code 43" in the device manager.

Is windows capable of running 5 cards at all or is it my setup?

Thanks in advance to any help!

EDIT:

I have a MSI 790FX-GD70 motherboard and 5x7970 mounted on it. The motherboard supports 4x PCI-E x16 and 1x PCI-E x1. But still one card is showing Code 43. If I unplug another card, the card with error 43 starts to work. Im using windows 7 64x. I guess the motherboard is not capable of 5 cards. I guess the PCIe buses are somehow with shared resources.

[juggalodarkclow]

I believe Win 7 can support 8 GPU's. I think the 7970's are dual gpu's? Therefore 4 7970's = 8 gpu's.

https://bitcointalk.org/index.php?topic=11677.0

[malevolent]

7970 is a single core

7990 is a dual core

Depending on the driver version, motherboard (and bios, cfg, sometimes the number of connected devices) it is possible to run up to 8 GPUs but sometimes there are problems with less than that.
More than 8 GPUs may be possible in some circumstances but it's difficult and exotic enough that it's not worth mentioning as a practical mining solution.

[philips]

I have a MSI 790FX-GD70 motherboard................................. I guess the motherboard is not capable of 5 cards.

I have 5 cards on the very same board and one is a dual GPU (AMD6990), so 6 GPU in total.