In general the more common an hardware info app is the more likely it is that the hardware faker have integrated a patch to let a system info app display wrong values.
Therefore the best way to identify fake hardware is not to use an app at all. Using a Linux command-line program e.g. executed via adb identifying fake values or values that do not match if more likely. To do so I would recommend to copy a (renamed) busybox binary via adb to the phone and then use it to check free/total RAM and existing partitions and their size.