In my living room I have been running a Ceton PCIe InfiniTV4 in WMC with good results for a long time using just the integrated Sandy Bridge i3 graphics. While that is a reasonable solution, I have a big display and there is some motion and artifacting that a discrete card can rememdy.
In the long run I hope to use JRiver and MadVR for cable playback so that also argues for a reasonably competent GPU. I installed a GTX 454 in this HTPC in the last week and saw inprovementins in shadow detail, deinterlacing artifacts and anti-aliasing so all that is good. I also saw fewer of the broken or dropped frames that would occur with both cable and ATSC. Sadly there is an audio glitch the makes the Nvidia an unaccceptable solution despite the above benefits. Mostly during commercials and constantly on some other cable channels I get audio drops outs. I bitstream with stock codecs.
My desktop workstation has been running either a GTS 450 or a GTX 454 for sometime. It was on this box which I only occasionally watch cable TV that I first discovered CNN and some other channels would have drop outs during commercials mostly. Both boxes are Sandy Bridge i3s. The workstation actually would flash video while it was dropping video. It has an intel H67 board, the HTPC in the living room has an H61. On the H61 video is unaffected at all. Both play the content without the glitch on the integrated graphics.
So the H67 would drop video and audio during Commercials on CNN and other Ceton provided channels but never on OTA. The H61 would maintain the video and drop just audio. Almost seemed like a variant of the Silent Stream bug. Both boxes are bitsream to different generation and model Denons. Like the H67 ATSC is unaffected. The H67 is W7 Home Premium 32 bit. The H61 runs W7 Pro 64 bit.
Both boxes do not exhibit the problem with the i3 iGPU. I have tried everything I can think of but you are pretty limited in WMC with Live TV as to what you can change.
JRiver with its (I will call it preview) version of Ceton support, plays the same problematic content without the glitch on both the iGPU and the two Nvidia cards.
I have the late WHQL Nividia drivers.. although this issue has haunted me for a long time over many Nvidia driver releases and is why I had continued using the i3 iGPU as the video solution on my main HTPC. it was only in recent days I had actually verified the problem existed with Nvidia on the HTPC but had long suspected it would act the same and so had put off the switch till now.
I ordered last night an HIS AMD HD 7790 with a bad taste in my mouth because of the various nightmares I had over the years with ATI drivers.
Has anyone else run into this problem? Found a work around perhaps? It is an odd problem and I have never seen it reported here though I have mentioned it a few times in various threads.
Are the recent Radeon drivers less likely to bork a system image?
Samsung 78" JS8600, Mits WD-92840 43" Samsung 43ku7000 - Lumagen Radiance XS, Martin Logan Motion 40s, Ascend Sierra 2s
58" Panny Plasma -DVDO DUO, Usher S520, JBL HLS-610, Definitive SM45, MusicHall Marimba