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diff --git a/shakti/m_class.mdwn b/shakti/m_class.mdwn
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@@ -27,6 +27,13 @@ details see
 
 [[shakti_libre_riscv.jpg]]
 
+## Die area estimates
+
+* <http://hwacha.org/papers/riscv-esscirc2014-talk.pdf>
+* 40nm 64-bit rocket single-core single-issue in-order: 0.14mm^2
+* 40nm 16-16k L1 caches, 0.25mm^2
+* <http://people.csail.mit.edu/beckmann/publications/tech.../grain_size_tr_feb_2010.pdf>
+
 ## Targetting full Libre Licensing to the bedrock.
 
 The only barrier to being able to replicate the masks from scratch