View Full Version : gtx400 series audio codec

07-06-10, 07:30 AM
I've never seen anything mentioned about the audio capabilities of the 400 series cards. They do have thier own audio processing capabilities correct? I was just wondering how good it was, (I think) I remember reading how the ATI HDMI Audio driver was actually pretty decent. My guess is neither of the two would be better than a dedicated sound card (I have an x-fi titanium), and that they're probably only there to offer audio over HDMI that doesn't come from spdif passthrough, but otherwise pretty basic.

07-06-10, 07:48 AM
i wsn't aware of the nvidia series having audio on the cards....isn't it a ati thing?

07-06-10, 08:26 AM
i wsn't aware of the nvidia series having audio on the cards....isn't it a ati thing?

That's what I'm asking, I thought I read that it did, but maybe it just has spdif passthrough.

07-06-10, 08:34 AM
From 470/480 datasheet:

Digital Audio

Support for the following audio modes:
o Dolby Digital (AC3), DTS 5.1, Multi-channel (7.1) LPCM, Dolby Digital Plus
Data rates of 44.1 KHz, 48 KHz, 88.2 KHz, 96 KHz, 176 KHz, and 192 KHz
Word sizes of 16-bit, 20-bit, and 24-bit

07-06-10, 06:22 PM
I'm pretty sure nvidia stopped doing passthroughs and it does audio processing. You are better off using digital component or optical rather than hdmi audio if you have a dedicated sound card. Plus I think the pass through spdif had more limited audio modes than listed above.

07-06-10, 09:31 PM
There's an emulated sound device on all VP4 (GT210/220/230/240/310/320/330/340/GTX480/GTX480) and VP3 (8200/8300/9300/9400) hardware.

VP4 supports dual audio outputs over two digital ports (DVI/HDMI/display port). If you look in device manager of a VP4 based card there should be 4 HDMI audio devices (two per port).

However an output won't show up in audio devices until you connect something (receiver/TV) which can accept audio.

Just like ATI's HD4000/5000 VP4 hardware can do uncompressed upto 7.1 PCM audio (uncompressed/RAW) @24 bit 192 kHz or lossy bitstreamed (undecoded) standard def audio (Dolby Digital/DTS). (The HD2000/HD3000 could only do uncompressed stereo or lossy DD/DTS).

HD5000 can do (bitstream) compressed (somewhat lossy/undecoded) HD audio Dolby Digital Plus/Dolby TruHD (This is based on DVD-Audio's lossless MLP audio) and DTS-HD and DTS-HD Master Audio.

Currently no nvidia card can bitstream lossless audio.