dsl speedtest slower than isp test
I had my DSL speed increased to 8 mb, from a 1.5 mb.
I use an older wifi router and connect wifi to my laptops (W7 and W8) and use an Ethernet connection for one desktop XP.
I have run Web based speed tests from several suppliers, including my ISP, and all show nothing higher than 5.5 mb (both for wifi and Ethernet). The speed was just over 4 mb last night about 10 PM.
I contacted the ISP Internet technical support and quickly got a ISP test, which they reported to show 8+ mb agreed by my modem and the ISP.
Is it possible the Internet tests are not accurate? I have used several and all showed about 1.5 mb when I had that service. Or is there a need to update (or simply replace due to a fault) router? It is supposed to provide up to 54 mb wifi, must be one of the modern 802.11- protocols.