Now now @emiseda, it's not good to mislead us like this. You even made me pay a visit to Orange. The only difference between the black and white modem is the manufacturer (ZTE and Huawei respectively). In fact Orange website uses Huawei to describe the 3G+
Orange modes of connection (CDMA, ADSL) are mapped to servers that give maximum of 512kpbs hence my speedtest result from there
http://www.speedtest.net/result/680139702.png. Out of interest, both HSDPA (Safaricom) and EV-DO belong to the 3.5G family.
It may be unwise to change my Safaricom modem for Orange modem on basis of speed alone considering results of my earlier Safaricom speedtest.