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Low DPC latency sound cards

post #1 of 5
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Looking for low DPC latency sound cards or devices to game on. Is there a data sheet or tests that have been done to measure this? I've seen the Uni drivers but heard they were snake oil. Even tested them myself and didn't find a difference through thorough tests.
     
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post #2 of 5
Not that I know of. DPC latency is going to be affected by how many PCI/PCIE slots are used up in your system and how much hardware/software you have installed on your PC. I know that if my DPCLAT gets really bad I have to turn off other hardware/software in order for the latency to stay consistent so my sound doesn't lag. If you build a DAW or use any DAW hardware latency is important but if you just plan to play games on a non-DAW system you won't have much problem with most soundcards installed.

If you use something like a FireWire digital audio hardware you will want to use a dedicated FireWire card. What people recommended me was using a TI (Texas Instrument) chipset PCI/PCIE FireWire card. I bought one and it reduce the latency greatly over the onboard FireWire and my latency problem disappeared. There's no guarantee that any audio card will be audio latency problem free. You should just disable any DAW hardware that you're not using or use a separate machine for DAW. I use a MOTU Ultralite MKIII as my main audio sound and as my DAW. It's the only way I could game and do some digital audio recording without having a DAW dedicated machine.
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post #3 of 5
I've never had DPC latency issues with Realtek onboard or any C-Media based sound card with drivers direct from the chip maker.

If you have an ASUS card, chances are it uses a C-Media chip, and you should be using C-Media's drivers if latency is important.
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post #4 of 5
What? Why do you want that? Do you know what DPC latency is?

The DPC is a queue. The sound card driver can't control how long the queue is- if you have a DPC latency issue, its caused by other drivers hogging up the queue. Its manifested as drop outs- usually a click or chirp- and NOT as sound latency.

If you're worried about sound latency, that's different, and is determined by the size of the sound buffer. Which is determined by the software generating the sound and almost never adjustable in games. Some sound drivers struggle with too short a buffer, though.

You can use ASIO to decrease sound latency, but that requires support from BOTH the sound card driver AND the software using the card. I don't know of any games that support ASIO.

I've successfully used my Sound Blaster X-Fi with stupidly short sound buffers, even down to 2 ms, but its really rather pointless and I'm not sure its feasible under a game load. Also, remember a screen refreshing at 60hz shows each frame for 16ms.
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post #5 of 5
I don't think he's talking about sound latency at all.

There are all sorts of drivers and programs that can crap up the DPC queue, including some that come with audio cards.
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