I tried to find an underclocking speed that would make my 4B 4GB perform similarly to my 3B+. It's very difficult to find a test that eliminates all the variables. I settled on a single oggenc job on a 90-minute flac file, as I figured that involved a bit of disk read and write, and a lot of CPU activity. I used the same hard disk on both machines, and I used a USB2 socket on the 4B so as to match the 3B+.
On the 3B+ the task took 11m 07s. On the 4B at the standard 1500MHz it took 4m 13s - quite an improvement. I had to underclock the 4B to 600MHz to get that time up to 10m 12s - still 9% faster than the 3B+. The temperature conditions were far from equal, so the only thing I can tell is that underclocking the 4B does lower the temperature, but only by a couple of degrees. The 3B+, sealed inside the official case without a heatsink or fan, got up to 63 degrees during this task. The 4B, mounted inside my amplifier enclosure (powered down, so at room temperature) with a 40mm heatsink and no fan, got up to 57 degrees at 1500MHz, and 55 degrees at 600MHz. So the surprising things for me were: 1) the 4B is very much faster than the 3B+ at this task with their default clock speeds 2) the temperature savings by underclocking the 4B are minimal So I shall be running my 4B at the default 1500MHz, and based on these and earlier tests I'm happy that the conditions inside my amplifier are fairly kind to the 4B. ------------------------------------------------------------------------ chill's Profile: http://forums.slimdevices.com/member.php?userid=10839 View this thread: http://forums.slimdevices.com/showthread.php?t=110690 _______________________________________________ discuss mailing list discuss@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/discuss
