Dead Horde is a coop top down mutant shooter.
It looks a lot like Alien Swarm and should be no problems for most PCs to run but it does seem to have a creative use of lighting effects which can be seen best in the Dead Horde gameplay trailer. Lets take look at the system requirements...
Dead Horde System Requirements
OS: Windows XP Sp3, Windows Vista Sp2, Windows 7
CPU: Intel Core 2 duo 2.4Ghz or higher
RAM: 2 GB
GFX: NVIDIA 8800 GT / ATI 3850HD(Shader 3.0 or better)
GFX RAM: 512MB
DX: DirectX 9.0c
HDD: 1 GB Free disc space
You will notice that we are using slightly adjusted Dead Hordes requirements on our tool because we feel that you will be able to run this fine on a slightly lower spec'ed machine. Send through your system performance feedback in the game discussion area as always (at the bottom of the Dead Horde game detail page).