The only difference is the price and the weight, as PCM011989 says the fans are included.
Net weight (kg) Dx weighs = 15.3 and DX weighs = 16.8 Pre-installed fans: ModelLIGHT BASE 900 DX | Black LIGHT BASE 900 FX | Black Fan side - 3x Light Wings Reversed 140mm PWM Rear fan - 1x Light Wings 140mm PWM Bottom fan - - Dimensions (L x W x H), (mm) - 140 x 25 x 140 Speed at 100% PWM / 12V (rpm) - 1500 / 1300 Air volume at 100% (CFM / m3/h) - 56.0 / 95.1 | 51.37 / 87.28 Air pressure at 100% PWM / 12V (mm H2O)- 1.49 / 1.1 Volume at 100% PWM / 12V (dB(A)) - 23.3 / 25.5 Voltage range (V DC) - 5-13.2 / 5-12 Power consumption (W) - 3.8 / 0.72 Rated current (A) - 0.32 / 0.06 Connector plug - 4-pin PWM Life expectancy at 25 °C (hours) - 60,000 Fan control - 2x 12 ports Gross weight, packaging (kg) 17.7 18.7 Recommended retail prices vary
Hope I could help...
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