![imac 27 late 2013 mini displayport imac 27 late 2013 mini displayport](https://s3.us-west-2.amazonaws.com/inv2.sellyourmac.com/prod/inventory/DE103105/ebaypos-2-DE103105-IMG_9594.jpg)
- #Imac 27 late 2013 mini displayport drivers#
- #Imac 27 late 2013 mini displayport driver#
- #Imac 27 late 2013 mini displayport Patch#
- #Imac 27 late 2013 mini displayport full#
- #Imac 27 late 2013 mini displayport free#
Your iMac comes with 90 days of free telephone support and a one-year limited warranty.
#Imac 27 late 2013 mini displayport full#
Simultaneously supports full native resolution on the built-in display and up to a 30-inch display (2560 by 1600 pixels) on an external display.NVIDIA GeForce GTX 775M graphics processor with 2GB of GDDR5 memoryĬonfigurable to NVIDIA GeForce GTX 780M with 4GB of GDDR5 memory. NVIDIA GeForce GT 755M graphics processor with 1GB of GDDR5 memory 8GB (two 4GB) of 1600MHz DDR3 memory four user-accessible SO-DIMM slotsĬonfigurable to 3TB hard drive, 1TB or 3TB Fusion Drive, or 256GB, 512GB, or 1TB of flash storage.27-inch (diagonal) LED-backlit display with IPS technology 2560-by-1440 resolution with support for millions of colorsģ.2GHz quad-core Intel Core i5 processor (Turbo Boost up to 3.6GHz) with 6MB 元 cacheģ.4GHz quad-core Intel Core i5 processor (Turbo Boost up to 3.8GHz) with 6MB 元 cacheĬonfigurable to 3.5GHz quad-core Intel Core i7 (Turbo Boost up to 3.9GHz).
#Imac 27 late 2013 mini displayport Patch#
I'll maybe use Lilu/WhateverGreen (loaded by OCLP) to patch the IOFramebuffer to trap all the mode calls. I need to find a way to detect the output pixel color depth to verify this. The output pixel depth may remain at 30 bit which exceeds the bandwidth limit causing the display to go blank. I believe the problem is that the "Millions of colors" color depth option is applying to the framebuffer pixel color depth but not to the output color depth.
#Imac 27 late 2013 mini displayport driver#
Maybe the driver indicates that it doesn't do dithering or doesn't do color depth conversion? This way, the driver could use the extra bits to perform dithering on the output. However, the color depth option usually just affects the framebuffer color depth so there's no point in removing the "Billions of colors" color depth option. I noticed that the display modes don't have a "Billions of colors" color depth option in SwitchResX after 55Hz so it knows there's a HBR bandwidth limitation and knows that it affects color depth options at different timings. I have an iMac (27-inch, Late 2013) with GTX 780M.
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#Imac 27 late 2013 mini displayport drivers#
Your GPU is old and the drivers are old, so the timing info doesn't have info about pixel format or output color depth. Your AllRez output shows you are already using 8bpc framebuffer. SwitchResX has an option to select millions of colors (8bpc) in the menu but this usually only changes the framebuffer pixel depth. It's another case of macOS not taking bottlenecks into account. To get to higher than 280MHz (required for your wider display) we need the macOS to do 8bpc but it's forcing 10bpc? macOS might be thinking it can do 10bpc because you have a HBR2 capable Kepler GPU, but the Thunderbolt port is forcing HBR link rate. The normal HBR displays you might connect are 2560x1600 which only require 260 MHz. I think we're running into the 10bpc limit of HBR (288 MHz) as said #14. The way to test this is to use the same 358MHz or lower timing from a Mac that supports HBR2 link rate. If the display can do then it means the blanking can be really small. So maybe there's some difference we can see in the blanking between CVT-RB and CVT-RB2 that may give a clue. Click to expand.The more important number is usually the pixel clock.ĬVT-RB2: 53,54,55,56Hz -> 275.36, 280.75, 286.14, 291.54 MHzīut in your case, even though 281.56 MHz works for CVT-RB, you could not get 280.75 MHz to work for CVT-RB2.