X2 270 vs X2 240 WITH FIREFOX 26 We compare AMD Athlon II X2 270 3.4Ghz Regor to AMD Athlon II X2 240 2.8Ghz Regor including Sapphire Radeon R7 250 to find out which is fastest with Firefox 26 when using benchmarks such as Octane, Speed Battle and Sunspider with the Windows XP Operating System."