Asus Nvidia GTX660-DC2O-2GD5

Graphics Engine
NVIDIA GeForce GTX 660
Bus Standard
PCI Express 3.0
Video Memory
GDDR5 2GB
Engine Clock
GPU Boost Clock : 1085 MHz
GPU Base Clock : 1020 MHz
CUDA Core
960
Memory Clock
6008 MHz ( 1502 MHz GDDR5 )
Memory Interface
192-bit
Resolution
DVI Max Resolution : 2560x1600
Interface
DVI Output : Yes x 1 (DVI-I), Yes x 1 (DVI-D)
HDMI Output : Yes x 1 
Display Port : Yes x 1 (Regular DP)
HDCP Support : Yes
Power Consumption
up to 150W1 additional 6 pin PCIe power required
Software
ASUS GPU Tweak & Driver
ASUS Features
DirectCU Series
OC Series 
Super Alloy Power
Dimensions
10.2 " x 5.2 " x 1.5 " Inch
Note
●To have the best cooling performance, ASUS GTX660-DC2T-2GD5 extends the fansink to 2 slots. Please double check you Chassis and Motherboard dimension prior to purchase to make sure it fits in your system! 
●Note that the actual boost clock will vary depending on actual system conditions. For more information, please visit http://www.geforce.com/ 
● No UEFI support.
* No native UEFI BIOS support, for UEFI BIOS, please download from ASUS technique support site. (The update tool only for ASUS MB.)