How to determine using which flash device to store the configuration data for configuring Altera FPGA

In http://www.altera.com/literature/hb/cfg/cyc_c51014.pdf

Table 1 lists the supported Altera EPCS devices.

Example 1. Compression Ratio Calculation

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EP4SGX530 = 189,000,000 bits

EPCS128 = 134,217,728 bits

Preliminary data indicates that compression typically reduces the configuration bitstream size by 35% to 55%. Assume worst case that is 35% decompression.

189,000,000 bits x 0.65 = 122,850,000 bits

The EPCS128 device is suitable.

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For example: Cyclone V E FPGA Device 5CEA7

In http://www.altera.com/literature/hb/cyclone-v/cv_51002.pdf
Table 43 lists the uncompressed raw binary file (.rbf) sizes for Cyclone V devices.

The EPCS64 device is suitable for the  Cyclone V E FPGA Device 5CEA7 .