lsv, I have to disagree with you here....
Many people have posted in this thread asserting that there is a difference. So your assumption that onboard audio is comparable to discreet is at least subjectively false.
Saying that the DACs are comparable and therefore the audio output is comparable is a gross oversimplification. A DAC is only one component of a digital audio device. Even if they were comparable, it would not mean the signal coming out of each device would be.
That aside, how can we be sure the DAC in each is comparable at all? Do you have any technical information on the DACs present in AC'97 and prosumer cards?
The difference between my $60 discreet card and my onboard AC'97 was immediately noticed by audio laymen who heard my computer before and after install, even with my el-cheapo $20 speakers. I also used to have two machines next to each other in the same room with the same el-cheapo speakers, one running a discreet card and one using onboard. The difference between AC'97 and discreet was staggering.
At a minimum, audio quality difference between each solution is subjective and cannot be written off as simply as onboard = discreet.
$200+ uber cards do have their place, but their added feature sets usually do not justify the increased cost to the end user. There are a few end users who may desire those features enough to sink in the extra cash. Though that audience is likely very small, it does not make those extra features "snakeoil".
On EMI: The onboard audio devices are usually located in one of two locations: right next to the cpu, or near the PCI slots. If the onboard chip is located right next to your graphics card, it will be subjected to very similar levels of EMI as the discreet sound card. If the chip is next to your cpu... well... graphics cards aren't the only devices in your computer that consume lots of power. There is likely a comparable amount of EMI from the VRMs / fans near the CPU as there is from the VRMs / fans on a GPU. It is also likely that discreet cards, being located on their own PCH, would be more able to filter / sink EMI on the outputs than their onboard counterparts.
Offloading the DSP to an independent device via USB / Firewire would go a long way towards reducing EMI, but then you have to consider the quality of the receiving devices as well. Most USB headphones, for instance, use software only DSP, which brings us right back to subjective analysis. You cannot simply say that and external receiver will always outperform an internal device due to EMI reductions.
Price: people spend hundreds of dollars on car audio systems that they may only listen to for a few minutes a day. What's wrong with spending <$100 if the difference is just as tangible? But, this goes back to your assumption that onboard and discreet are comparable....
I have noticed that raising bit depth above 16 doesn't improve the quality noticeably... I wonder if you can circumvent Direct Sound to output better audio.... Time for more research!
Many people have posted in this thread asserting that there is a difference. So your assumption that onboard audio is comparable to discreet is at least subjectively false.
Saying that the DACs are comparable and therefore the audio output is comparable is a gross oversimplification. A DAC is only one component of a digital audio device. Even if they were comparable, it would not mean the signal coming out of each device would be.
That aside, how can we be sure the DAC in each is comparable at all? Do you have any technical information on the DACs present in AC'97 and prosumer cards?
The difference between my $60 discreet card and my onboard AC'97 was immediately noticed by audio laymen who heard my computer before and after install, even with my el-cheapo $20 speakers. I also used to have two machines next to each other in the same room with the same el-cheapo speakers, one running a discreet card and one using onboard. The difference between AC'97 and discreet was staggering.
At a minimum, audio quality difference between each solution is subjective and cannot be written off as simply as onboard = discreet.
$200+ uber cards do have their place, but their added feature sets usually do not justify the increased cost to the end user. There are a few end users who may desire those features enough to sink in the extra cash. Though that audience is likely very small, it does not make those extra features "snakeoil".
On EMI: The onboard audio devices are usually located in one of two locations: right next to the cpu, or near the PCI slots. If the onboard chip is located right next to your graphics card, it will be subjected to very similar levels of EMI as the discreet sound card. If the chip is next to your cpu... well... graphics cards aren't the only devices in your computer that consume lots of power. There is likely a comparable amount of EMI from the VRMs / fans near the CPU as there is from the VRMs / fans on a GPU. It is also likely that discreet cards, being located on their own PCH, would be more able to filter / sink EMI on the outputs than their onboard counterparts.
Offloading the DSP to an independent device via USB / Firewire would go a long way towards reducing EMI, but then you have to consider the quality of the receiving devices as well. Most USB headphones, for instance, use software only DSP, which brings us right back to subjective analysis. You cannot simply say that and external receiver will always outperform an internal device due to EMI reductions.
Price: people spend hundreds of dollars on car audio systems that they may only listen to for a few minutes a day. What's wrong with spending <$100 if the difference is just as tangible? But, this goes back to your assumption that onboard and discreet are comparable....
I have noticed that raising bit depth above 16 doesn't improve the quality noticeably... I wonder if you can circumvent Direct Sound to output better audio.... Time for more research!
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