I have build a system a few months a go for my self. Here are the specs
Processor AMD FX 6300 - stock 3.5 GHz ( 4.1 GHz )
Motherboard GIGABYTE GA-970A-DS3P AM3+
Ram 4 GB 1333 Mhz (upgrading to 12 GB soon)
Graphics AMD R9 270 MSI Gaming
LC Power 600W (40A)
CPU Cooler CM Hyper TX3 Evo
The question is can I crossfire another r9 270 with this mobo? And what would be the preformance. Also it's better for me if I could crossfire my R9 270 with an R7 265 if that is possible.
Here is the r7 265 if that means anything to you: http://www.amazon.com/MSI-R7-265-2GD5-OC/dp/B00JJNQ8ZA/...
Nope you can't crossfire any 200 series card with another their can be some big changes between the different cards throughout that series. Here is a link to a chart here on TH with the compatibility of different cards. http://www.tomshardware.com/faq/id-2176514/crossfire-co...
Your motherboard will support it but not very efficiently and I7baby is correct on the 990FX chipset would be the best current one out there for it.
The GIGABYTE GA-970A-DS3P Has only 4+1 power phases, No VRM Heatsink and you need to get custom cooling to be able to clock cpu's on it
The GIGABYTE GA-990FXA-UD3 Has 8+2 power phases, a Heatsinked VRM and you can overclock a cpu without using custom cooling
The 8+2 phases allows better voltage control also for GPus as well as cpus. So its important and a sign of a good motherboard.
There are some 970A chipset mobos that aren't too bad. But yours isn't one of them. I wouldn't have bought it to start with. But in the end, the choice is yours. It might survive. So might the ram, cpu and gpus that you mount on it. But it is more likely to fail than the alternative I suggested.
It won't use the second card fully if you look at the info for your motherboard the second card will only run at PCI-E x4 and the main will be at X16 so yeah it may help slightly but you will be far from fully utilizing it. For that reason I would wait and see if I could find someone interested in your current card and upgrade to a better single card set up till you are ready to upgrade other hardware also.