Here's my Hi-end HTPC config. I highly recommend the ASUS GTX760 DCUII for video. Very quiet.
I built a new permanent HTPC not long ago to replace the part-time Surface Pro 2 which was struggling with processor throttling with MadVR scaling of SD material.
This config is also a great "Steambox" for gaming and awesome HTPC which is whisper quiet even with the GPU at 60% utilisation when applying 4 taps of Jinc in MadVR on SD material.
The Spec is:
Gigabyte z87x-ud3h motherboard Intel i7 4770 3.9Ghz Quad core Haswell processor 8GB TridentX 2400Mhz DDR3 RamSamsung 840 120GB SSDAsus GTX760 DirectCU II 2GB DDR5 Ram which is whisper quietSeasonic 550W PSU which is also whisper quiet Corsair H75 CPU water cooler which is also whisper quietAnd of course a wireless Xbox controller and old logitech dinovo bluetooth keyboard with media pad and mouse.
I realise the spec is a little over the top for HTPC duties but it makes a very good gaming machine, easily spitting out 60FPS in 2D with max graphics quality (ultra settings) and between 30 and 60FPS in 3D games on high settings. (which I can now enjoy at 1080P SBS 3D @ 60hz with the latest firmware!)
Redoing the calibration with an Nvidia GTX 760 was a similar experience to getting a good picture with the Surface Pro 2 Intel 4400 GPU, but I did learn a few more things that quite surprised me.
Firstly to get BTB below 16 and WTW above 235 to pass through with the Nvidia I had to set the nvidia drivers to 16-235 and do the same throughout the whole video chain. (MadVR)
With the same calibration on the Intel 4400 and using YUV 0-255 I had some visible banding in the grey scale and could still see BTB.
Using 16-235 YUV444 on the Nvidia I got BTB and no banding pattern in the grayscale ramp because their was no compression or interpolation in the video path.
With the GTX 760 I also had to use a display port to HDMI adaptor to get 7.1 channel DTSHD MA audio for my sony 5200ES receiver as it wont pass through 1080p24 with the Nvidia card but it would with the Intel 4400.
So im using HDMI for video and display port to HDMI for audio. The HDMI port on the GTX 760 goes straight to the projector.
The projector is also running in YUV mode again as it was with the Intel 4400 which means brightness is at 48 and contrast at 55. This seems to get the best out of this projector for my screen. Very happy with my new HTPC/Steambox with the W1080ST. Its perfect!