I am on bt infinity and had my v1 modem replaced by kelly yesterday, because of this thread I was aware they might not change the PSU so waited to see if he did, he did not so I stopped him and the conversation went like this..
Me: Have you changed the PSU? ( Stupid question, I'm standing right there.. I can see he hasn't )
Kelly: No would you like me to? ( he didn't sound too keen )
Me: Yes please. ( While he was changeing it I explain that I'd heard the new PSU's have a higher amp rating (thanks to you fellas in this thread ) )
Kelly: We are told we don't have to replace them.
Unfortunatly I didn't think to ask if it was Openreach that told him he doesn't have to change the PSU.
After he had gone I noticed the higher amp rating is also listed on the back of the modem too, versions 1, 2 and 3 have 0.7A on the label but the v4 has 1A:
v4 (3B) Modem Label
v4 (3B) PSU Label
v1 Modem Label
I asked if he would leave me a spare 3B but he wasn't allowed to and also took the old modem away ( put it back in the box in place of the new one so I guess it's going back to huawei )
The white PSU is slightly bigger than the black one and the lead is thicker/less flimsy, overall it feels better quality.
Speed and IP Profile are the same, the admin interface seems to load faster, attainable rates are very slightly higher and don't drop as much during the evening although, that could just be because of the time of the resync, 13:30 vs 3AM of the last one.
My before and after stats are in the zip bellow for anyone interested, if you spot anything interesting I'd love to hear it.
Before-After-Modem-Change.zip
Thanks.