From system profiler.

Processor  3.2 GHz Intel Core i5
Memory  8 GB 1333 MHz DDR3
Graphics NVIDIA GeForce GTX 650 Ti
  Type:	GPU
  Bus:	PCIe
  PCIe Lane Width:	x16
  VRAM (Total):	1024 MB
  Vendor:	NVIDIA (0x10de)
  Device ID:	0x11c6
  Revision ID:	0x00a1
  ROM Revision:	preset 80.06.21.00.27
Displays:
DELL U2713HM:
  Resolution:	2560 x 1440 @ 60 Hz
  Pixel Depth:	32-Bit Color (ARGB8888)
  Main Display:	Yes
  Mirror:	Off
  Online:	Yes
  Rotation:	Supported