Comparison of AMD Radeon RX 680M video card vs AMD Radeon R7 - 256 (Toronto) video card by specifications and benchmarks. AMD Radeon RX 680M runs at 2.000 GHz base clock speed and has 8 GB of memory, while video card AMD Radeon R7 - 256 (Toronto) runs at 0.800 GHz base clock speed and has 0 GB of memory. The TDP of the first video card is --, and the second is --. Compare the table of benchmark results to find out which graphic card is better.