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%ToDo: Shall we add the unrolling of projection-loop in parameters?
\begin{table}[htb] %[htbp]
\begin{threeparttable}
\caption{\label{tbl:newtex} Performance and configuration of cache-aware texture-based back-projection kernel}
\centering
\noindent
%\resizebox{\columnwidth}{!}{\begin{tabular}{} ... \end{\tabular}}
\begin{tabularx}{\columnwidth}{ | X c | r | r r r | }
\hline
& & & \multicolumn{3}{c|}{Configuration} \\
\mhd{|c}{GPU} & \mhd{c|}{$n_v$} & \mhd{c|}{Perf.} & \mhd{c}{Occupancy} & \mhd{c}{L1/ShMem} & \mhd{c|}{Cache} \\
\hline
GTX295 & 1 & 49 GU/s & 75\% & - & - \\
\hline
\multirow{3}{*}{GTX580}
& 1 & 49 GU/s & 50\% & 16/48 & - \\
& 2 & 97 GU/s & 50\% & 16/48 & - \\
& 4 & 172 GU/s & 50\% & 16/48 & - \\
\hline
\multirow{3}{*}{GTX680}
& 1 & 118 GU/s & 100\% & 16/48 & - \\
& 2 & 232 GU/s & 100\% & 32/32 & - \\
\hline
\multirow{3}{*}{Titan}
& 1 & 200 GU/s & 100\% & 16/48 & - \\
& 2 & 362 GU/s & 100\% & 32/32 & - \\
\hline
\multirow{3}{*}{GTX980}
& 1 & 155 GU/s & 100\% & - & - \\
& 2 & 304 GU/s & 100\% & - & - \\
& 4 & 555 GU/s & 75\% & - & - \\
\hline
\multirow{3}{*}{Titan X}
& 1 & 389 GU/s & 100\% & - & - \\
& 2 & 726 GU/s & 100\% & - & - \\
& 4 &1396 GU/s & 75\% & - & - \\
\hline
HD5970 & 1 & 56 GU/s & - & - & 256 \\
\hline
HD7970 & 1 & 115 GU/s & - & - & 256 \\
\hline
R9-290 & 1 & 146 GU/s & - & - & 256 \\
\hline
\end{tabularx}
\begin{tablenotes}
\item The table summarizes the performance and optimal configuration for the texture-based back-projection kernel. Information is provided for all supported slice-modes.
\end{tablenotes}
\end{threeparttable}
\end{table}
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