| Cardex Tseng ET4000AX | 1994 | I.B.M and Compatibles | VGA Graphics Card | 16bit ISA | Cardex | Tseng Laboratories, Inc. |
| Cirrus Logic CL-GD520A | 1990 | I.B.M and Compatibles | VGA Graphics Card | 8bit ISA | Cirrus Logic Inc. |
| Crystal CX4237B | 1996 | I.B.M and Compatibles | Sound Card | 16bit ISA | Crystal Semiconductors |
| Crystal CX4236 | 1996 | I.B.M and Compatibles | Sound Card | 16bit ISA | Crystal Semiconductors |
| Cirrus Logic CL-GD54M30 | 1995 | I.B.M and Compatibles | VGA Graphics Card | PCI | Cirrus Logic Inc. |
| CMI8738 | 2000 | I.B.M and Compatibles | PCI | Sound Card | C-Media Electronics, Inc. |
| CMI8738 | 2001 | I.B.M and Compatibles | PCI | Sound Card | C-Media Electronics, Inc. |
| CMI8738 | 2003 | I.B.M and Compatibles | PCI | Sound Card | C-Media Electronics, Inc. |
| Creative CT1810 CD-ROM Interface Card | 1993 | I.B.M and Compatibles | 8bit ISA | CD-ROM Interface Card | Creative Technology Ltd. |
| Cirrus Logic CL-GD5428 | 1994 | I.B.M and Compatibles | VGA Graphics Card | VL-BUS | Cirrus Logic Inc. |
| CableTron Systems Ethernet Card | 1991 | I.B.M and Compatibles | 16bit ISA | Ethernet Card | Cabletron Systems |
| CableTron Systems Ethernet Card | 1991 | I.B.M and Compatibles | 16bit ISA | Ethernet Card | Cabletron Systems |
| CableTron Systems Ethernet Card | 1991 | I.B.M and Compatibles | 16bit ISA | Ethernet Card | Cabletron Systems |
| Cirrus Logic CL-GD5428 | 1994 | I.B.M and Compatibles | VGA Graphics Card | VL-BUS | Cirrus Logic Inc. |
| Chips F64300 | 1994 | I.B.M and Compatibles | VGA Graphics Card | VL-BUS | Chips and Technologies |
| Cirrus Logic CL-GD54M40 | 1996 | I.B.M and Compatibles | VGA Graphics Card | PCI | Cirrus Logic Inc. |
| Compaq TLAN TNETE100APCM | 1997 | I.B.M and Compatibles | PCI | Ethernet Card | Compaq Computer Company |
| Cirrus Logic MFM Controller Card | 1988 | I.B.M and Compatibles | 16bit ISA | Floppy Controller | MFM Controller | Cirrus Logic Inc. |
| Colorado 1Mb/s - 500Kb/s Jumperless Tape Controller | 1992 | I.B.M and Compatibles | 8bit ISA | Tape Controller | Colorado Memory Systems Inc. |
| Cirrus Logic MFM Controller Card | 1990 | I.B.M and Compatibles | 16bit ISA | Floppy Controller | MFM Controller | Cirrus Logic Inc. |
| CableTron Systems Ethernet Card | 1990 | I.B.M and Compatibles | 16bit ISA | Ethernet Card | Cabletron Systems |
| CableTron Systems Ethernet Card | 1990 | I.B.M and Compatibles | 16bit ISA | Ethernet Card | Cabletron Systems |
| Chips 386SX Mainboard | 1991 | I.B.M and Compatibles | 8bit ISA | 16bit ISA | Box F1 (Mainboards) | Mainboard | 80386 | SX | Chips and Technologies |
| CH-386-33A | 1992 | I.B.M and Compatibles | 8bit ISA | 16bit ISA | Mainboard | Battery damage | 80386 | Box F2 (Mainboards) | Unknown Manufacturer |
| Chips 286 Mainboard | 1988 | I.B.M and Compatibles | 8bit ISA | 16bit ISA | Mainboard | 80286 | Box F2 (Mainboards) | Chips and Technologies |
| Chips 286 Mainboard | 1989 | I.B.M and Compatibles | 8bit ISA | 16bit ISA | Mainboard | Battery removal | 80286 | Box F2 (Mainboards) | Chips and Technologies |
| Cirrus Logic CL-GD54M30 | 1996 | I.B.M and Compatibles | VGA Graphics Card | PCI | Cirrus Logic Inc. |
| Cirrus Logic CL-GD5440 | 1996 | I.B.M and Compatibles | VGA Graphics Card | PCI | Cirrus Logic Inc. |
| Color Graphics Card | 1986 | I.B.M and Compatibles | 8bit ISA | CGA Graphics Card | Unknown Manufacturer |
| Chips AniGraphics AniVideo Card | 1991 | I.B.M and Compatibles | VGA Graphics Card | 16bit ISA | Chips and Technologies |