System Information
Xubuntu-64 12.04;
Intel i7; 12GB DDR3; NVidia GTX570

Blender Version
Broken: (example: 2.69.7 4b206af, see splash screen)
2.71-testbuild1
Worked: (optional)
2.70a

Short description of error
Testing a scene with a sIBL environment loaded. Renders fine with CPU but GPU fails for lack of memory (GTX570 has 1.2GB memory, textures no more than 20MB from sIBL).
Example scene tested sIBL "Basketball Court":
BasketballCourt_3k.hdr ...... 16.5 MB
BasketballCourt_8k.jpg ....... 19.0 MB
BasketballCourt_Env.hdr ..... 157.5 KB
Only object in scene is default cube.

Exact steps for others to reproduce the error
Run the attached .blend with 2.71-testbuild1 with CUDA enabled/disabled and compare with 2.70a render results.