Rockchip 33xx are slower than that OMAP5 at least in mono-core use.
For example RK3308 uses Cortex-A35, much less powerful than Cortex-A15 in OMPA5.
RK3368 uses Cortex-A55, while Cortex-A15 is much more powerful.
Cortex-A15 yields 3.5 to 4.01 DMIPS/MHz. It was top line with 15 stage integer/17–25 stage floating point pipeline, with out-of-order speculative issue 3-way superscalar execution pipeline.
Cortex-A35 yields 1.78 DMIPS/MHz, and Cortex-A53 yields 2.24 DMIPS/MHz. Both are 8 stage with in-order 2-way superescalar execution pipeline.
Cortex-A15 was top line in 32-bits ARM, while Cortex-A35/A53 are low line in 64-bits ARM.