출처 : http://forums.creative.com/creativelabs/board/message?board.id=soundblaster&message.id=61926
So now to our findings: We believe that the larger volume of data being requested is, in some systems, causing larger access delays to system memory, especially when Sound Blaster
X-Fi is sharing memory access with high-end graphics and/or hard drives. We have found that with certain high-end systems and configurations, Sound Blaster X-Fi is being held off from receiving data from the PCI bus for significant periods of time, in some cases for close to two-thirds of a millisecond. This causes our audio buffers to underflow, which produces crackling sounds. The obvious answer to this would be to increase the latency tolerance, but due to the requirement for audio to synchronize accurately with graphics, we cannot increase the latency tolerance beyond a certain point.
현재 크리티브에서 찾아낸 문제점은 큰 데이터 요구가 있을 경우, 메모리와 PCI 버스에서의 딜레이로 인해 언더플로우가 발생하여 깨지는 음이 들린다고 합니다.
Our tests have proved that in many cases these problems can be remedied with a simple BIOS update but this did not resolve the issues for all customers experiencing the issues. We therefore continued to investigate and have made a significant finding. In some systems we have resolved the issues by setting the motherboards to dual-channel memory mode to improve the memory bandwidth and response. Below you can see the configuration of two of the systems that we initially experienced issues with and subsequently resolved by setting to dual-channel memory mode.
펌웨어 패치후에도 이 현상은 나타날 수 있으며, 메인보드 바이오스 업데이트 이후에도 발생할 수 있는 문제입니다. 실험으로 얻어진 새로운 해결 방법은 메모리 대역을 늘리기 위해 듀얼 채널을 사용하는 것입니다. 실제로 문제가 있던 시스템이 듀얼 채널을 사용함으로서 문제가 해결된 사례가 있다고 합니다.
However we want to highlight that some reported crackling issues were found to be normal clipping that can easily be resolved by balancing audio settings. We specifically found that some game titles produce a very strong audio output signal that in some circumstances can overload our hardware DSP algorithms, such as CMSS-3D and 24-bit Crystalizer. While this issue is not at all related to the PCI bus traffic issues described above, the result of this is a distortion that might be described as "crackling" (although technically it is "clipping"). We would therefore recommend that all customers run a very simple test. Please try turning down either the game volume, or the Windows "Wave" volume, to see if this remedies the problem. If it does, it would be really helpful if you would notify us of this.
다른 깨지는 음이 발생하는 경우도 있는데, 이는 특정 게임들이 하드웨어 DSP 알고리즘에 과부하가 걸리게 만들어서 생기는 문제로 오디오 밸런스 셋팅으로 해결을 볼 수 있다고 합니다.
참고하시길.
