add architecture comparison table

diff --git a/3d_gpu/arch_comparison.mdwn b/3d_gpu/arch_comparison.mdwn
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+# Architectural Comparisons
+
+This table compares important factors for a decision in which ISA to use
+and support
+
+[[!table  data="""
+Feature/Need   | RISC-V | MIPS    | OpenPOWER | OpenRISC |
+Open           | NO (1) | NO (2)  | NO (3)    | Yes      |
+Libre-friendly | NO (1) | unknown | Yes       | Yes      |
+Trademarked    | Yes    | Yes     | Yes       | No       |
+gcc            | Yes    | Yes     | Yes       | Yes      |
+llvm           | Yes    | Yes     | Yes       | Yes      |
+distros (deb)  | Yes    | Yes     | Yes       | No       |
+buildroot      | Yes    | Yes     | Yes       | Yes      |
+linux kernel   | Yes    | Yes     | Yes       | Yes      |
+"""]]