based around the RV515 core as well. Beginning in 2006, Radeon X1300 and X1550 products were shifted to the RV505 core, which had similar capabilities and features as the previous RV515 core, but was manufactured by TSMC using an 80 nm process (reduced from the 90 nm process of the RV515). X1600 series X1600 uses the M56 core which is based on the RV530 core, a core similar but distinct from RV515. The RV530 has a 3:1 ratio of pixel shaders to texture units. It possesses 12 pixel shaders while retaining RV515's four texture units and four ROPs. It also gains three extra vertex shaders, bringing the total to 5 units. The chip's single "quad" has 3 pixel shader processors per pipeline, similar to the design of R580's 4 quads. This means that RV530 has the same texturing ability as the X1300 at the same clock speed, but with its 12 pixel shaders it is on par with the X1800 in shader computational performance. Due to the programming content of available games, the X1600 is greatly hampered by lack of texturing power. The X1600 was positioned to replace Radeon X600 and Radeon X700 as ATI's mid-range GPU. The Mobility Radeon X1600 and X1700 are also based on the RV530. X1650 series The X1650 series has two parts: the X1650 Pro uses the RV535 core (which is a RV530 core manufactured on the newer 80 nm process), and has both a lower power consumption and heat output than the X1600. The other part, the X1650XT, uses the newer RV570 core (also known as the RV560) though it has lower processing power (note that the fully equipped RV570 core powers the X1950Pro, a high-performance card) to match its main competitor, Nvidia's 7600GT. X1800 series Originally the flagship of the X1000 series, the X1800 series was released with mild reception due to the rolling release and the gain by its competitor at that time, NVIDIA's GeForce 7 Series. When the X1800 entered the market in late 2005, it was the first high-end video card with a 90 nm GPU. ATI opted to fit the cards with either 256 MB or 512 MB on-board memory (foreseeing a future of ever growing demands on local memory size). The X1800XT PE was exclusively on 512 MB on-board memory. The X1800 replaced the R480-based Radeon X850 as ATI's premier performance GPU. With R520's delayed release, its competition