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The X1950 Pro uses the RV570-chip which has a reduced number of pixel shaders (48 to 36) and lower clock frequencies. In essence the chip is a bit different whereas the X1950XT is based upon the chip of the X1950XTX; all 48 shaders are active. Differences can be found in memory (GDDR3 opposed to GDDR4 for the XTX) and lower clock frequencies. At last but not least the XT usually has just 256MB of RAM. > Read more