I've got a 37" LG LC2D panel and a G5 PowerMac with dual DVI outputs. I just picked up a DVI->HDMI cable, expecting it output to a resolution of 1366*768. However, the only options I have are: 1024*768, 1280*720, and 1920*540 (which doesn't work). Is it not possible for the Mac to output to a 1366*768 resolution on the 256MB GeForce 6600 PCI Express? If not, what are my upgrade options? Thanks!