The T4 SCSI bridge consumes approximately 50% more power than the T3/T3u SATA and T5 IDE bridges. When Tableau’s engineers designed the T4 they decided that the extra heat dissipated by the T4 warranted the addition of ventilation slots. While the T3/T3u and T5 do not generate enough heat to require ventilation, Tableau has decided to standardize future case production and all products will incorporate ventilation slots beginning in late 2004.