Since upgrading to a 6990 is out of my budget I've been considering crossfiring my current 6950 with a new 6950 but I have no idea whether this is truly worth it and if my PSU can actually take it.
Motherboard - ASRock 890GX-Extreme 3 890G
Processor - AMD AM3 x6 1100T 3.30 ghz Phenom II
GFX - AMD Powercolour 2 gb 6950
Ram - G.Skill-NT 8GB (4gx2) DDR3 1333 ram (intel 1155,1156,AM3)
HDD - Hitachi Deskstar 3tb Sata HDD 7200 RPM
Disk Drive - LG Blu-Ray SATA Writer
PSU - Antec EarthWatts EA 650 Watt PSU
Cooling - A-Power 120mm 2x Ball Bearing Case Fan
I did a rough check and found that the processor and the two 6950's would hit 540 watts (probably more) which i don't think gives me much breathing room. If i need to i can upgrade the power supply but i'd be hitting close to 450 AUD for an 850 Watt if i did and well a 6990 is only 300 or so more than that. So is it worth it and can my system take it? Also, should i get a better cooling system(if i need one, may aswell get a 6990)?