That's what I wanted to know, so I'd do something like this, keeping in mind that you'll need an active displayport adapter for the third monitor which you probably already have if you currently are using a triple monitor configuration. You should also edit your original post to say G41 motherboard as there is no G47 board.
And if you are not outputting the game to all three displays, you do not need SLI or CF. You can easily use your current card to display your two desktop screens and the new GPU to run gaming on the third screen or use the new GPU for two screens and the old GPU for the third. Actually, depending on your monitor resolution you might be able to use the new GPU for all three. I run three screens off an R9 280 with no problem, even gaming. All screens are 1080 BUT I don't use an eyefinity or surround configuration either, but since you don't plan to do that, it shouldn't be an issue.
And, just to clarify, you can use two GPUs in a non SLI or CF configuration for multiple screen displays when necessary or desired. Sometimes this works better than using a displayport adapter as it keeps all non-gaming loads off the gaming GPU.
PCPartPicker part list /
Price breakdown by merchant
CPU Cooler: Noctua NH-U14S 55.0 CFM CPU Cooler ($64.98 @ OutletPC)
Motherboard: Gigabyte GA-Z97X-Gaming 5 ATX LGA1150 Motherboard ($146.98 @ OutletPC)
Video Card: Gigabyte GeForce GTX 980 4GB WINDFORCE Video Card ($597.99 @ NCIX US)
Total: $809.95
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-12-19 14:36 EST-0500
Or this:
PCPartPicker part list /
Price breakdown by merchant
CPU Cooler: Noctua NH-U14S 55.0 CFM CPU Cooler ($64.98 @ OutletPC)
Motherboard: Gigabyte GA-Z97X-Gaming 5 ATX LGA1150 Motherboard ($146.98 @ OutletPC)
Video Card: Gigabyte GeForce GTX 970 4GB WINDFORCE Video Card (2-Way SLI) ($359.99 @ Newegg)
Video Card: Gigabyte GeForce GTX 970 4GB WINDFORCE Video Card (2-Way SLI) ($359.99 @ Newegg)
Total: $931.94
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-12-19 14:43 EST-0500
or this:
PCPartPicker part list /
Price breakdown by merchant
CPU Cooler: Noctua NH-U14S 55.0 CFM CPU Cooler ($64.98 @ OutletPC)
Motherboard: Gigabyte GA-Z97X-Gaming 5 ATX LGA1150 Motherboard ($146.98 @ OutletPC)
Video Card: Sapphire Radeon R9 290 4GB Tri-X Video Card (2-Way CrossFire) ($278.99 @ SuperBiiz)
Video Card: Sapphire Radeon R9 290 4GB Tri-X Video Card (2-Way CrossFire) ($278.99 @ SuperBiiz)
Total: $769.94
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-12-19 14:39 EST-0500
Or this, depending on your desire, or lack of, to use SLI or CF, and AMD or NVidia based cards:
PCPartPicker part list /
Price breakdown by merchant
CPU Cooler: Noctua NH-U14S 55.0 CFM CPU Cooler ($64.98 @ OutletPC)
Motherboard: Gigabyte GA-Z97X-Gaming 5 ATX LGA1150 Motherboard ($146.98 @ OutletPC)
Video Card: Sapphire Radeon R9 290X 8GB Vapor-X Video Card ($459.99 @ Newegg)
Total: $671.95
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-12-19 14:40 EST-0500
Either way, I'd replace the motherboard now since you plan to overclock. Your current board is a turd for overclocking and has poor power phase and VRM components.