This thread was created to show the differences between the 4870 and 4890 based on the information I've read about. Since we know this isn't a 4870 that was simply overclocked there should be a better understanding of what is different between the 2. What's different about the 4890's GPU? So far, what I found out is that the GPU has a de-coupling ring around it's edge. This de-coupling ring adds 3million more transistors making the total transistor count 959 million (up from 956 million). From the video interview the RV790 is a new ASIC. So is it a new chip? Physically, yes it is based on the improvements made but there is no logic design changes. The above pic should provide you with some ideas of what was changed. What's different about the video card itself? Below is a pic showing both the 4870 and 4890. You can clearly see that there is some differences between the 2. 4870 Heat Sink Design 4890 Heat Sink Design Backside of the 4870 Backside of the 4890 4870 VRMs 3+2. To the right is the controller. 4890 2 VRMs 5+2. To the right are 2 two Volterra VT1165MF controllers. source 4870 4890 Volterra VT1165 controllers source 4870 2 phase memory power 4890 CSP VT242WF source Overall IMO, the power design of the 4890 appears to be better then the 4870. Only time will tell how well performance gets as drivers mature. Please note that this post maybe edited if more information becomes available.