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AMD also made some changes on the power distribution systems, which resulted in consumption lower than on HD 4870.īeing certain that the RV790 will run at higher than 850MHz, AMD decided to showcase its HD 4890 at 900MHz in April and said how the cards will easily run at 1GHz. The RV790 core is isolated with a decap ring, used to suppress electromagnetic interference.
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As was the case with RV770 as well, the new GPU features 800 stream processors, 16 ROPs and 40 texture units.īy redesigning the internal structure, the old RV770 core has been adapted for higher clocks. The specs say the RV790 has 22sq.mm larger core and 3 million transistors more, which is not a lot of added transistors compared to the RV770’s 956 million. The difference between these two cards, the RV770 and RV790-based ones, is at a glance quite insignificant and is evident only in the higher MHz-count, but note that the core went through some significant changes allowing it to run at 1GHz. Of course, the HD 4870 comes from a generation of GPUs that was announced in June 2008. The RV790 runs at 850MHz, which is a significant improvement over the HD 4870’s 750MHz. Let us recap – the RV790 core has been announced in the beginning of April 2009, and it quickly found its place in AMD’s best single GPU graphics card. This GPU is the central point of the Radeon HD 4890 and its GDDR5 memory helps in achieving 1.6 TeraFLOPs. Review: Up to 17% faster than the reference HD 4890ĪMD recently rolled out its latest RV790–based card running at 1GHz, and the reason why this card is so special is obvious – the dream of 1GHz on your graphics card is now a reality.