“We are excited about the new iMac with Retina 5K Display,” rob-ART morgan reports for Bare Feats. “We ordered the 4.0GHz Quad-Core i7 model with Radeon R9 M295X GPU for our long term testing, but plan to benchmark it against the 3.5GHz quad-core i5 with R9 M290X GPU as well as models of non-Retina iMac.”
“The “Best for display” setting of the Retina 5K will be 2560×1440,” morgan reports. “Using the Displays System Preference panel, you will be able to scale the resolution up or down similarly to how it works with the Retina MacBook Pro. Some apps will offer you the choice of running at the full 5120×2880. Some will not. Whatever resolution you scale it to, the pixels-per-inch (ppi) will remain the same, thereby preserving the ‘Retina’ effect.”
“The top Quad-Core i7 is now clocked at 4.0GHz with Turbo Boost up to 4.4GHz. Compare that to the top Quad-Core i7 offered in the non-Retina iMac at 3.5GHz with Turbo Boost up to 3.9GHz,” morgan reports. “If you choose the 3.5GHz Quad-Core i5, keep in mind that, though it has Turbo Boost up to 3.9GHz, it does NOT support Hyper-Threading. It will not render with eight virtual cores the same way the Quad-Core i7 does. If your most demanding apps use more than four cores to render, you will want to spend the extra $250 for the Quad-Core i7.”
Read more in the full article here.