
Everything comes down to the fact that the U7600 just isn’t ULV enough.
You turn the machine on and let it sit there for a while. It idles at your desktop for about ten to fifteen minutes before a whiny little fan kicks in and runs for another ten to fifteen minutes. Then the cycle begins again. It’s not that it’s extremely loud or anything, just whiny and annoying. It can’t be good for the battery life either, which is already mediocre at best.
I took some power consumption numbers with my Kill-A-Watt and they are actually quite interesting:
TC4200 XT E6400
11 (8) 15 (12) 13 (10)
16 18 16
26 24 36
44 42 55
The first line is the “full idle”, power draw at the wall. The screen brightness is turned all the way down. The second line is full idle with the screen brightness all the way up. The third line is full processor load with max brightness. These nine figures are in Watts. The last line is battery capacity in Watt-Hours. There may be a significant margin of error due to the inefficiency of the respective power supplies.
Subsequently, there is a bracketed number on the first line, RMClock’s estimation of power draw; the real figure is probably somewhere in between. The TC4200 at idle and load is undervolted by about 0.3V, and the E6400 is undervolted only at load by about 0.2V. Now it seems somewhat ridiculous that XT, an ultraportable with a ULV processor, draws more power at idle than the full-sized E6400.
While I admit that the TC4200 has a significant advantage through undervolting, the E6400 idle should be very close to stock. It does have a 45nm processor, but it also has a larger screen, discrete GPU, optical drive, etc. I just don’t understand how Dell built such a power-hog of a twelve inch tablet. I’m extremely frustrated that Intel does not allow any sort of undervolting on the U7600. They can suck their ULV crap.
If you crunch the numbers, the XT gets just under three, the TC4200 gets just around four, and the E6400 gets just over four. That’s kind of ridiculous. Furthermore, the TC4200 and the E6400 are both completely silent at idle. The TC4200 can watch most SD anime without turning on the fan, and while the E6400 isn’t quite as good with noise, they’re both helluvalot better than the XT.
There are good things about the XT too, but I value power draw and noise enough such that it’s going back on eBay.