This is instructive. Remember how (Irdeto 2) whiteys turned brown in Humax embedded CAM but ran cool in Phoenix with NewCS? The puzzle was why - both ran the card at 5V. The explanation, supported by the observation here, is that the overheating was because of excessive EMM load - nothing to do with voltage at all. The difference between Phoenix and Humax is caching and retry behaviour: NewCS caches when it can but Humax doesn't.
That's not to say heat in receivers can't be reduced by dropping operating voltage to 3V - heat
will be reduced of course, to some extent at least (provided the card works at the lower voltage). You need to go about it the right way though: simple resistor hacks on VCC can lead to card damage. Receivers that use multi-voltage card controller ICs are much easier to reconfigure safely for 3V. (And as others have pointed out previously there are some cards which are
only designed for 1.8V or 3V and cannot be safely used at 5V at all; that's another story though.)
Sorry to wander off topic but I thought it was worth mentioning. EMM processing is one of the most heat-generating activities the cards do, which is why EMM caching makes such a difference to card running hot vs cool.
Re the card remaining updated, I expect it drops out periodically and needs to visit the provider box for a quick drink now and then
Unless of course you find a suitable external update client to send selected messages through to the receiver.
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