Computer Audio Asylum

RE: cMP - the open source high-end Memory Player

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cics

In Reply to: RE: cMP - the open source high-end Memory Player posted by aljordan on December 30, 2007 at 07:02:16

Only measured the CPU (which remains below 50 celcius) - because CPU is underclocked to 1200MHz, there's very little power consumption. That's why passive cooling works so well.

Case is large and has many ventilation holes allowing for cooling - the only area where temperature rises is at the CPU heatsink. I also have CPU shutdown temperature set to 75 celcius and have never experienced a problem.

Follow Ups:

RE: cMP - the open source high-end Memory Player - dan631 03:03:35 01/05/09 (2)
cics, I'm using a pcie Xonar card and was wondering: given that pcie prefers larger chunks of data, does it make sense to set foobar's buffer length higher? What about Asio settings?
Another question: rather than worry about cpu speed:voltage ratio, why not just upsample all files ahead of time and have them stored on the HDD as such? Assuming windows has been sufficiently cut down to size, 1GB RAM is enough to fit a song.

Edits: 01/05/09
- Xonar PCIe and pre-upsampling - cics 23:17:05 01/06/09 (1)
  See discussion on pre-upsampling . cPlay 2.0b15 does NOT include the CPU load reduction as planned (due next release).
  
  Use smallest buffer available. In foobar its 100ms - you could increase it to ~250ms. This is not related to PCIe data chunk sizes. For ASIO settings best result is achieved when latency is lowest. It's explained here .
  - cmp tweaks - dan631 01:26:09 01/08/09 (0)
    First off, thanks for the reply. I changed the settings as you suggested and I did notice a bit of an improvement. Do you still recommend the Gigabyte G31 board for pcie cards?
    
    WRT power supplies, jonnyguru's tests of the Antec Signature SG650 show extremely low ripple (under 16mV for all rails at full load). One caveat is that this PS's fan is PWM controlled - I don't know if that would add an appreciable amount of electrical noise or not. silentpcreview tested the unit as well. I'm not sure if this is better than your currently recommended PS, as I was unable to find tests for it.
    
    I've noticed there are a few options in acrylic PC cases available; I wonder how they would do for resonance damping vs aluminum.
    
    Finally, has anyone tried using carbon fiber, ERS "paper," or TI Shield on the components of a cMP? TI shield, in particular, seems to be recommended for just about everything by some of the folks in Tweaker's.
    - Antec Signature at jonnyguru (Open in New Window)

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