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\begin{tikzpicture}

\begin{axis}[%
view={-37.5}{30},
width=\figurewidth,
height=\figureheight,
scale only axis,
xmin=15, xmax=150,
xlabel={$R$},
xmajorgrids,
ymin=2, ymax=20,
ylabel={GPUs},
ymajorgrids,
zmin=1, zmax=3,
zlabel={k},
zmajorgrids,
axis lines*=left]

\addplot3[%
surf,
colormap={mymap}{[1pt] rgb(0pt)=(0.2,0.2,0.2); rgb(19pt)=(0.8,0.8,0.8)},
shader=faceted,
draw=black]
coordinates{ 
(15,2,1)(15,4,1)(15,6,1)(15,8,1)(15,10,1)(15,12,1)(15,14,1)(15,16,1)(15,18,1)(15,20,1)

(30,2,2)(30,4,2)(30,6,2)(30,8,2)(30,10,2)(30,12,2)(30,14,2)(30,16,2)(30,18,2)(30,20,2)

(45,2,2)(45,4,2)(45,6,2)(45,8,2)(45,10,2)(45,12,2)(45,14,2)(45,16,2)(45,18,2)(45,20,2)

(60,2,2)(60,4,2)(60,6,2)(60,8,2)(60,10,2)(60,12,2)(60,14,2)(60,16,2)(60,18,2)(60,20,2)

(75,2,2)(75,4,2)(75,6,2)(75,8,2)(75,10,2)(75,12,2)(75,14,2)(75,16,2)(75,18,2)(75,20,2)

(90,2,2)(90,4,2)(90,6,2)(90,8,2)(90,10,2)(90,12,2)(90,14,2)(90,16,2)(90,18,2)(90,20,2)

(105,2,2)(105,4,2)(105,6,2)(105,8,2)(105,10,2)(105,12,2)(105,14,2)(105,16,2)(105,18,2)(105,20,2)

(120,2,2)(120,4,2)(120,6,2)(120,8,2)(120,10,2)(120,12,2)(120,14,2)(120,16,2)(120,18,2)(120,20,2)

(135,2,2)(135,4,2)(135,6,2)(135,8,2)(135,10,3)(135,12,3)(135,14,3)(135,16,3)(135,18,3)(135,20,3)

(150,2,2)(150,4,2)(150,6,3)(150,8,3)(150,10,3)(150,12,3)(150,14,3)(150,16,3)(150,18,3)(150,20,3)

};
\end{axis}
\end{tikzpicture}%