What the 39600 logic elements and 532 I/O mean for your design
Core supply is 0.97 V to 1.03 V.
Comparison note
The EP4CE40F29C8 is the same silicon (39600 LEs, 532 I/O, same package) but with a speed-grade C8 instead of C9.

Intel Cyclone® IV E FPGA, EP4CE40F29C9LN, 39600 logic elements, 532 I/O, 1161216 RAM bits, 780-BGA, 0.97V~1.03V core, 0°C to 85°C.
| Parameter | Value |
|---|---|
| Series | Cyclone® IV E |
| Mounting | Surface Mount |
| Supply voltage | 0.97V ~ 1.03V |
| Operating temperature | 0°C ~ 85°C (TJ) |
| Package | Tray |
| Number of i (O) | 532 |
| Case | 780-BGA |
| Total RAM bits | 1161216 |
| Number of LABs (CLBs) | 2475 |
| Number of logic elements (Cells) | 39600 |
Core supply is 0.97 V to 1.03 V.
The EP4CE40F29C8 is the same silicon (39600 LEs, 532 I/O, same package) but with a speed-grade C8 instead of C9.
The core supply voltage range is 0.97 V to 1.03 V.
The EP4CE40F29C8 is the same Cyclone IV E die (same logic elements, RAM, I/O) in the same package, differing only in speed grade (C8 vs C9). It is a pin-compatible alternative for designs that need higher timing margin.
The 'LN' suffix indicates lead-free (RoHS-compliant) finish.