For all you slim line case folks out there, Galaxy just released a low-profile version of the new Maxwell equipped GTX 750 and 750 Ti. It even has a small factory OC to the core. It's still a 6 pin-free card. At this time it is only available direct from Galaxy. But I suspect that will change.
http://store.galaxytechus.com/GALAXY-GeForce-GTX-750-GC-Slim-1-GB-GDDR5-PCI-Express-30-DVIHDMIVGA-Graphics-CardbrbrFree-Gift-150-In-Game-for-Warface-Path-of-Exile-and-Heroes-of-Newerth_p_89.html
http://store.galaxytechus.com/GALAXY-GeForce-GTX-750-Ti-GC-Slim-2-GB-GDDR5-PCI-Express-30-DVIHDMIVGA-Graphics-CardbrbrFree-Gift-150-In-Game-for-Warface-Path-of-Exile-and-Heroes-of-Newerth_p_90.html
http://store.galaxytechus.com/GALAXY-GeForce-GTX-750-GC-Slim-1-GB-GDDR5-PCI-Express-30-DVIHDMIVGA-Graphics-CardbrbrFree-Gift-150-In-Game-for-Warface-Path-of-Exile-and-Heroes-of-Newerth_p_89.html
http://store.galaxytechus.com/GALAXY-GeForce-GTX-750-Ti-GC-Slim-2-GB-GDDR5-PCI-Express-30-DVIHDMIVGA-Graphics-CardbrbrFree-Gift-150-In-Game-for-Warface-Path-of-Exile-and-Heroes-of-Newerth_p_90.html