\begin{tikzpicture} \begin{pgfonlayer}{nodelayer} \node [style=none] (0) at (0.25, -0.5) {}; \node [style=none] (1) at (-2.5, 4) {}; \node [style=none] (2) at (-1.75, 9.25) {}; \node [style=none] (3) at (3, 13.25) {}; \node [style=none] (4) at (9.25, 13.5) {}; \node [style=none] (5) at (15.75, 12.75) {}; \node [style=none] (6) at (17.5, 1.25) {}; \node [style=none] (7) at (12.5, -1) {}; \node [style=none] (8) at (6.75, -1.25) {}; \node [style=cloud elements] (10) at (6.25, 12.5) {Scheduling\\Policy}; \node [style=cloud elements] (11) at (12.25, 8) {Number\\of\\Devices}; \node [style=cloud elements] (13) at (-0.5, 6.5) {Refresh\\Policy}; \node [style=cloud elements] (14) at (5.25, 7.25) {Number\\of\\Channels}; \node [style=cloud elements] (16) at (16.5, 9.5) {Power\\Down\\Policy}; \node [style=cloud elements] (17) at (6.75, 1.25) {DRAM\\Speed}; \node [style=cloud elements] (18) at (9, 5) {Page\\Policy}; \node [style=cloud elements] (20) at (12.5, 1.25) {Number\\of\\Ranks}; \node [style=cloud elements] (21) at (1.5, 2.5) {Address\\Mapping}; \node [style=cloud elements] (22) at (1, 10.75) {DRAM\\Standard}; \node [style=cloud elements] (23) at (12.25, 12.5) {DRAM\\Capacity}; \node [style=cloud elements] (24) at (17, 4.5) {Timing\\Parameters}; \node [style=none] (25) at (19, 6.75) {}; \end{pgfonlayer} \begin{pgfonlayer}{edgelayer} \draw [style=very thick line, bend left=75, looseness=1.25] (0.center) to (1.center); \draw [style=very thick line, bend left=90, looseness=1.25] (1.center) to (2.center); \draw [style=very thick line, bend left=75, looseness=1.25] (2.center) to (3.center); \draw [style=very thick line, bend left=75] (3.center) to (4.center); \draw [style=very thick line, bend left=75] (4.center) to (5.center); \draw [style=very thick line, bend left=60, looseness=1.25] (6.center) to (7.center); \draw [style=very thick line, bend left=60] (7.center) to (8.center); \draw [style=very thick line, bend left=75] (8.center) to (0.center); \draw [style=very thick line, bend right=75, looseness=1.25] (6.center) to (25.center); \draw [style=very thick line, bend right=75, looseness=1.25] (25.center) to (5.center); \end{pgfonlayer} \end{tikzpicture}