CPU Performance With WmmX
In order to find out how fast the 312 MHz PXA270 Xscale CPU of the Axim X30 is in practice, we tested its predecessor, the Axim X3i, as a comparison. In it is the 400 MHz PXA263, the top model of the old PXA26X series. This processor has neither wireless MMX commands nor does it have wireless SpeedStep to save power. However, with this CPU, the speed can also be lowered manually with software to 200 MHz.
No MMX commands were used in the CPU arithmetic benchmark. Consequently, the new CPU unit fell behind the predecessor due to its lower core speed. With almost identical core speeds, a PXA270 is just as fast as the predecessor PXA263.
But, things look different as soon as MMX commands come into play. In this case, the new CPU can clearly assert itself in spite of a lower core speed of 312 MHz compared to the predecessor's higher speed of400 MHz.
Even with an almost identical core speed, the PXA270 processor computes twice as fast as the predecessor PXA263 with this low-level benchmark. However, for multimedia floating point operations that are not based on iMMX code, the new processor in the X30 doesn't reveal any advantages at the same speed.
CPU Performance Without WmmX
A non-wMMX-optimized application, like the pocket PC benchmark from our cooperation partner VNU, confirms the results that we got with Sandra. If the program code is not xMMX-optimized, then the new CPU with the same core speed is not faster than its predecessor.
In the case of the middle class model we tested, the Axim X30 312 MHz, it even turns out to be slower than an old X3i with a 400 MHz PXA263.