N97 is better than N100 (it is faster and it supports in-band ECC), but it has a higher power consumption.
ODROID H4+ is faster than Radxa X4, due to the higher clock frequency and due to having a 64-bit DRAM interface, while Radxa X4 has a 32-bit DRAM interface.
Radxa X4 is cheaper, when considering the price including the DRAM & WiFi (under $100 with 8 GB DRAM), and it is much smaller, having the credit card form factor. An advantage of Radxa X4 over almost all other small SBCs is that its USB 3 ports are 10 Gb/s ports, allowing fast links to USB hubs or external SSDs or USB Ethernet interfaces.
When compared to the SBCs using RK3588 or to Radxa NIO 12L, the only cheap SBC with a CPU including a quadruple Cortex-A78 (from Mediatek; comparable SBCs from Qualcomm or NVIDIA are very expensive, starting around $500), Radxa X4 is cheaper than most of them and whether it is faster depends on the application. The N100 CPU will be faster in single thread, but it can be slower in multiple-thread applications, when, depending on cooling, its clock frequency may drop to lower values than for the SBCs using Cortex-A76 or Cortex-A78. Many of those SBCs use 64-bit DRAM interfaces, so they may also be faster for programs that happen to be limited by the memory bandwidth (vs. Radxa X4 with a 32-bit DRAM interface). The GPU of N100 is also much faster and it has much better software support than the Arm GPUs. USB and PCIe should also work better on N100.
There is also AAEON UP 7000, which is a very similar credit-card-sized SBC with Alder Lake N, but it is 2 to 3 times more expensive.
This year, Intel has introduced a refresh of Alder Lake N, with the code name "Amston Lake". The Amston Lake CPUs are branded in the Atom x7000 series and they are intended for embedded applications. Radxa has said that there will be future variants of the Radxa X4 which will use some Amston Lake models instead of N100, including 8-core models.
ODROID H4+ is faster than Radxa X4, due to the higher clock frequency and due to having a 64-bit DRAM interface, while Radxa X4 has a 32-bit DRAM interface.
Radxa X4 is cheaper, when considering the price including the DRAM & WiFi (under $100 with 8 GB DRAM), and it is much smaller, having the credit card form factor. An advantage of Radxa X4 over almost all other small SBCs is that its USB 3 ports are 10 Gb/s ports, allowing fast links to USB hubs or external SSDs or USB Ethernet interfaces.
When compared to the SBCs using RK3588 or to Radxa NIO 12L, the only cheap SBC with a CPU including a quadruple Cortex-A78 (from Mediatek; comparable SBCs from Qualcomm or NVIDIA are very expensive, starting around $500), Radxa X4 is cheaper than most of them and whether it is faster depends on the application. The N100 CPU will be faster in single thread, but it can be slower in multiple-thread applications, when, depending on cooling, its clock frequency may drop to lower values than for the SBCs using Cortex-A76 or Cortex-A78. Many of those SBCs use 64-bit DRAM interfaces, so they may also be faster for programs that happen to be limited by the memory bandwidth (vs. Radxa X4 with a 32-bit DRAM interface). The GPU of N100 is also much faster and it has much better software support than the Arm GPUs. USB and PCIe should also work better on N100.
There is also AAEON UP 7000, which is a very similar credit-card-sized SBC with Alder Lake N, but it is 2 to 3 times more expensive.
This year, Intel has introduced a refresh of Alder Lake N, with the code name "Amston Lake". The Amston Lake CPUs are branded in the Atom x7000 series and they are intended for embedded applications. Radxa has said that there will be future variants of the Radxa X4 which will use some Amston Lake models instead of N100, including 8-core models.