Hi all,
I attached a brand new Orange Pi 4 to the grid. It is aery good board for boinc: rk3399, 4gb ram. It runs Armbian Ubuntu Bionic.
I noticed that a lot of tasks are invalid: http://gene.disi.unitn.it/test/results.php?hostid=64953&offset=0&show_names=0&state=5&appid=
the interesting thing is that if you see the ratio of valid/invalid tasks it looks like that the tasks are ok in 4/6 core but invalid for 2/6 cores.
At the moment I am writing there are 80 valid tasks and 25 invalid tasks.

Dual-core ARM Cortex-A72 MPCore processor and Quad-core ARM Cortex-A53 MPCore processor, both are high-performance, low-power and cached application processor.
Two CPU clusters. Big cluster with dual-core Cortex-A72 is optimized for high-performance and little cluster with quad-core Cortex-A53 is optimized for low power.
Full implementation of the ARM architecture v8-A instruction set, ARM Neon Advanced SIMD (single instruction, multiple data) support for accelerating media and signal processing
CCI500 ensures the memory coherency between the two clusters
Each Cortex-A72 integrates48KB L1 instruction cache and 32KB L1 data cache with 4-way set associative. Each Cortex A53 integrates 32KB L1 instruction cache and 32kB L1 data cache separately with 4-way set associative
1MB unified L2 Cache for Big cluster, 512KB unified L2 Cache for Little cluster
Trustzone technology support