Which should I go for? 1 Sapphire Radeon R9 290 Tri-X OC 4096MB GDDR5 PCI-E or 2x XFX AMD Radeon R9 280 827MHz 3GB PCI-E 3.0 HDMI DD Core Editions? I currently run 8 core 4.4ghz AMD FX Piledriver, 32Gb of 1336hz ram 2Gb Asus gt620 and an Asrock 970 extreme3 mobo. I mostly use the pc for heavy particle simulations and sfx rendering Thanks in advance. Dave. Render times are getting too long and my last piece says it would take 180 hours to render and I'm not putting up with it any more!