I've been looking for a little while at purchasing a new graphics card. This is the first time I've actually purchased one, so I don't know exactly what to look for. My system is a Biostar A780L3G Motherboard with 4GB ram, an AMD Phenom II X4 840 processor running at 3.2 GHz. My PSU is a Diablotek 500W ATX power supply, and I have one 6 pin PCI-E power connector on it. I have an almost ten year old 18 inch monitor at a resolution of 1024x768, yeah I know it's not the best. I've found a couple of graphics cards I'm thinking about, particularly the AMD Radeon HD 6770, one by PowerColor, the other by XFX, for $100 and $109 respectively. Both have 1GB GDDR5 memory, and seem to be otherwise the same card. I'm specifically looking for one around $100, with room to go up to $130. I would like to play Call of Duty Black Ops, Modern Warfare 3, and Skyrim, at decent settings, meaning, 1024x768 resolution, mid to high anti-aliasing settings, and a frame rate of 40 and higher. What is the difference between GDDR and DDR, and will it affect the gaming experience in any way, and which manufacturers of the graphics cards would you recommend? I don't care if it is an NVidia card or an AMD card, and any suggestions for around $100 cards would be helpful. Thanks