$ sudo dmidecode -t bios
Handle 0x0000, DMI type 0, 24 bytes
BIOS Information
	Vendor: Dell Inc.                
	Version: 2.3.1 
	Release Date: 05/21/2007
	Address: 0xF0000
	Runtime Size: 64 kB
	ROM Size: 1024 kB
	Characteristics:
		PCI is supported
		PNP is supported
		APM is supported
		BIOS is upgradeable
		BIOS shadowing is allowed
		Boot from CD is supported
		Selectable boot is supported
		EDD is supported
		Japanese floppy for Toshiba 1.2 MB is supported (int 13h)
		Print screen service is supported (int 5h)
		8042 keyboard services are supported (int 9h)
		Serial services are supported (int 14h)
		Printer services are supported (int 17h)
		ACPI is supported
		USB legacy is supported
		LS-120 boot is supported
		BIOS boot specification is supported
		Function key-initiated network boot is supported
		Targeted content distribution is supported
	BIOS Revision: 2.3

$ sudo dmidecode
[...]
Handle 0x0100, DMI type 1, 27 bytes
System Information
	Manufacturer: Dell Inc.                
	Product Name: OptiPlex 745                 
	Version: Not Specified
	Serial Number: 4Y2563J
	UUID: 44454C4C-5900-1032-8035-B4C04F36334A
	Wake-up Type: Power Switch
	SKU Number: Not Specified
	Family: Not Specified
[...]
Handle 0x0400, DMI type 4, 40 bytes
Processor Information
	Socket Designation: Microprocessor
	Type: Central Processor
	Family: Core 2
	Manufacturer: Intel
[...]
Handle 0x080D, DMI type 8, 9 bytes
Port Connector Information
	Internal Reference Designator: ENET
	Internal Connector Type: None
	External Reference Designator: Not Specified
	External Connector Type: RJ-45
	Port Type: Network Port
[...]
Handle 0x1000, DMI type 16, 15 bytes
Physical Memory Array
	Location: System Board Or Motherboard
	Use: System Memory
	Error Correction Type: Single-bit ECC
	Maximum Capacity: 8 GB
	Error Information Handle: Not Provided
	Number Of Devices: 4
[...]
Handle 0x1100, DMI type 17, 27 bytes
Memory Device
	Array Handle: 0x1000
	Error Information Handle: Not Provided
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 1024 MB
	Form Factor: DIMM
	Set: None
	Locator: DIMM_1
	Bank Locator: Not Specified
	Type: DDR
	Type Detail: Synchronous
	Speed: 667 MHz
[...]