http://www8.hp.com/emea_africa/en/products/desktops/product-detail.html?oid=6467134#!tab%3Dspecs

Operating system
Windows 7 Professional 64 (available through downgrade rights from Windows 8 Pro 64)
(This system is preinstalled with Windows 7 Professional software and also comes with a license and media for Windows 8 Pro software. You may only use one version of the Windows software at a time. Switching between versions will require you to uninstall one version and install the other version. You must back up all data (files, photos, etc.) before uninstalling and installing operating systems to avoid loss of your data.) 
Processor family 
Intel® Core™ i3 processor
Processor 
Intel® Core™ i3-4130 with Intel HD Graphics 4400 (3.4 GHz, 3 MB cache, 2 cores) 
Chipset 
Intel® Q85 Express 
Form factor 
Small Form Factor 
Management features 
Intel Standard Manageability (select models)
Environmental 
Low halogen


MemoryMemory <javascript: void(0);>
Memory, standard
4 GB 1600 MHz DDR3 SDRAM (1 x 4 GB)
Memory slots 
4 DIMM 


StorageStorage <javascript: void(0);>
Internal drive bays 
One 6,35 cm (2.5’’); One 8,9 cm (3.5") 
External drive bays 
One 8,9 cm (3.5"); One slimline 
Internal drive
500 GB 7200 rpm SATA 
Optical drive
Slim SATA SuperMulti DVD writer


Display and graphicsDisplay and graphics <javascript: void(0);>
Graphics
Inte®l HD 4600 Graphics 


Expansion featuresExpansion features <javascript: void(0);>
Ports
4 USB 3.0 
6 USB 2.0 
1 serial;2 PS/2 
1 VGA 
2 DisplayPort 
1 audio in 
1 audio out 
1 RJ-45 
1 headphone 
1 microphone
(Optional: 1 serial; 1 parallel)
Expansion slots
3 PCIe x1 
1 PCIe x16


Media devicesMedia devices <javascript: void(0);>
Audio 
HD audio with Realtek ALC221 codec; DTS Studio Sound audio management technology; Microphone and headphone front ports (3.5mm); Line-out and Line-In rear Ports (3.5mm); Multi-streaming capable; Internal speaker (standard) 


CommunicationsCommunications <javascript: void(0);>
Network interface
Intel I217LM Gigabit Network Connection


Power and operating requirementsPower and operating requirements <javascript: void(0);>
Power supply 
240W 92% efficient, active PFC
Operating temperature range 
10 to 35°C 
Operating humidity range 
10 to 90%RH 


Dimensions and weightDimensions and weight <javascript: void(0);>
Dimensions (W x D x H)
33.8 x 37.9 x 10 cm 
Weight
Starting at 7.6 kg
(Exact weight depends on configuration) 


Security managementSecurity management <javascript: void(0);>
Security management 
Trusted Platform Module (TPM) 1.2 
SATA port disablement (via BIOS) 
Drive lock 
Intel® Identify Protection Technology (IPT) 
Serial, parallel, USB enable/disable (via BIOS) 
Optional USB Port Disable at factory (user configurable via BIOS) 
Removable media write/boot control 
Power-On password (via BIOS) 
Setup password (via BIOS) 
HP Chassis (1 bay) Security Kit 
Solenoid Hood Lock / Sensor 
Support for chassis padlocks and cable lock devices


What's includedWhat's included <javascript: void(0);>
Software 
Computrace (status tracing) 
Device Access Manager 
Drive Encryption 
File Sanitizer (Activated via Wizard) 
Disk Sanitizer (external version) 
Microsoft Security Essentials (Windows 7) 
Microsoft Defender (Windows 8) 
Security Manager 
Secure Erase (Windows 8) 
Cyberlink Media Suite 
Cyberlink PhotoDirector 
Cyberlink Power Director 
Cyberlink Power DVD, BD 
Cyberlink Power2Go (Secure Burn) 
HP ePrint Driver 
HP PageLift 
HP Support Assistant (Windows 7) 
HP Recovery Disk Creator (Windows 7) 
HP Recovery Manager (Windows 8) 
HP QuickStart 
Adobe Flash Player (Windows 7) 
Bing Search for Internet Explorer 10 (Windows 7) 
Bing Search (Windows 8) 
Evernote 
PDF Complete (Windows 7) 
PDF Complete, Corporate Edition (Windows 8) 
Skype 
Buy Office
Keyboard 
HP USB Keyboard 
Warranty 
3-year limited warranty including 3 years of parts, labour, and next-business-day onsite service. Terms and conditions vary by country. Certain restrictions and exclusions apply.