post #11 of 11
Hi

I am in the same boat here re DPC and after doing a little research it seems the asus p8z77 v pro is used alot by sellers of audio daw systems...

But for me i may just go for the giga z77x ud3h its a good all rounder and where talking about micro seconds here ...115 microseconds in milliseconds is 0.115 and these ud3h boards can be bought now for less then £115 as appose to the asus which is over £150 ...no need for onboard as i will be on RME soundcard...




http://www.anandtech.com/show/5793/intel-z77-motherboard-review-with-ivy-bridge-asrock-asus-gigabyte-and-msi/15



DPC Latency

Deferred Procedure Call latency is a way in which Windows handles interrupt servicing. In order to wait for a processor to acknowledge the request, the system will queue all interrupt requests by priority. Critical interrupts will be handled as soon as possible, whereas lesser priority requests, such as audio, will be further down the line. Therefore, if the audio device requires data, it will have to wait until the request is processed before the buffer is filled. If the device drivers of higher priority components in a system are poorly implemented, this can cause delays in request scheduling and process time, resulting in an empty audio buffer – this leads to characteristic audible pauses, pops and clicks. Having a bigger buffer and correctly implemented system drivers obviously helps in this regard. The DPC latency checker measures how much time is processing DPCs from driver invocation – the lower the value will result in better audio transfer at smaller buffer sizes. Results are measured in microseconds and taken as the peak latency while cycling through a series of short HD videos - less than 500 microseconds usually gets the green light, but the lower the better.




DPC Latency Maximum

All the motherboards using Ivy Bridge chips do particularly well in our DPC test (as you would expect), with all boards coming in at under a very respectable 120 microseconds. The ASUS goes one step further with our lowest DPC score ever at 60 microseconds.