We have tested Sapphire Radeon HD 4850, model that represents first commercial available GPU from new generation of Radeon HD 4000 and is marked as R770 GPU. We are talking about cheap but very fast card which is part of new ATI’s policy. ATI decided to leave multiGPU systems for top class but user can buy a card to play with for some time that is not overpriced and later on you have a possibility of purchasing another one or even more, depending from your affinity and upgrade your system easily. Trump card that ATI used is 55nm technology process that actually results in GPU surface area from 260mm2, half less then surface of GTX280 is. Nevertheless, ATI succeed to pack 956 million transistors on such a small space. Number of Stream Processors is also increased regarding previous generation, but– number of SP is 800! Yes, you read exactly, eight hundred, but every fifth works with all functions and there are actually 160 of them. Of course, number of texture units was also increased considerably and there are 40 of them. ROPs are still present in same amount as before -16. Improvements were done on every step and true example for that are SIMD cores consisted of 80SPs with 16KB cache memory, L1 cache and four dedicated texture units. Of course, 55nm technology process means less consumption and in case of Radeon HD 4850 it sums around 110W, which is a huge step forward. R770 cards has support as for GDDR3 as for GDDR5 with 256bit memory bus bandwidth.