\includegraphics<1>[height=8cm]{figures/cpus/pmiphone_boardtopbig}
\includegraphics<2>[height=8cm]{figures/cpus/Intel_core_i7}
\includegraphics<3>[height=8cm]{figures/cpus/6600GT_GPU}
-\includegraphics<4>[height=8cm]{figures/cpus/Altera_StratixIV}
+% \includegraphics<4>[height=8cm]{figures/cpus/Altera_StratixIV}
}
\label{img:chips}
\end{figure}