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In Reply to: RE: results extra current measurements 5 Volt rail of P24 connector posted by Bertel on November 19, 2009 at 12:50:18
Thankx for your response. unfortunately it’s a typo. 2,06/05 must be: 3,06/05.
Yes my system is still circling around 2,9 amps on the 5 volt rail at the P24 connector
I went to great lengths in controlling and checking if everything and all value’s were set like the recommendations as described in http://cplay.sourceforge.net/. FSB de-voltage is at – 0,15 V (as recommended).
Since I use linear PSU’s to power the picoPSU-150-XT at the P24 and the P4, I discovered that it’s possible to cold boot at 130 Mhz busspeed and warm boot at 125 Mhz busspeed. However 130 Mhz is to slow for upsampling. Booting at 125 MHz into a normal XP installation is impossible. You than will crash into a BSOD. At 125 MHZ you can only boot into an XP installation that is 100% optimized as per cMP recommendations.
fully AOB optimized cMP2 PC -> Lynx AES16 -> XLR AES/EBU -> Lavry Black DA10 -> XLR Mogami Gold -> Klein & Hummel O300
Follow Ups:
Thanks Mark.
Using a single RAM module with smallest capacity offers lowest power consumption. Faster timings for 512RAM have ~5mA impact (on the lower consumption side: 2,87/88 vs 2.87 continuous). I certainly wasn't expecting this and would've been happy to go with same current. From a theoretical viewpoint, faster timings without any penalties, could potentially lower jitter. This is how I see it: if data streamed to soundcard happens slightly faster then we have less interference to its XO. I'll do some tests at 3-2-2-5/6 (I prefer keeping settings for a few days at a time). Big assumption here is both 12V and 3.3V lines remain unchanged - did you confirm this?
Reason for your higher 5V consumption over Robert's is the Lynx. It's more complicated, uses different chips and offers more channels than Juli@.
Hi Cics,
Thank you for your feedback.
2,87/88 versus 2,87.
Is it really relevant with the multimeter I used? It is not a professional one.
It's a Velleman multimeter DVM68 of 30 euro's for home/hobby use.
I don't know anything about it's stability, hysteresis and bias.
About accuracy the manual reports: basic DC current accuracy: ±1.2% (±2.0% for 10A range)
I wil re-do the measurements with 512 RAM HyperX at different timings again, but than also measure the current on the 12V and 3,3 V.
For what it’s worth:
Yesterday for measurement reason’s, I powered the cMP PC setup only with the Earth Watts 430 ATX PSU. It struck me somewhat that the sound quality wasn’t that much less, than I had expected it to be, from what I could remember when using the Juli@ with different PSU types. It sounded somewhat ‘digital’ again: ‘grainy’, ‘sandy’ and ‘the digital highs’ where back. But still, I’m under the impression that the Juli@ is more sensitive for swapping from an ATX PSU to a linear PSU, than the Lynx AES16 is.
I can’t check this back anymore because I sold my Juli@ one month a go. But from what I can remember: the positive effect on sound quality when using a linear PSU with the juli@ appears to be bigger, than when using the Lynx AES16. Or said the other way round: the Lynx AES16 seems less sensitive for type of PSU used.
fully AOB optimized cMP2 PC -> Lynx AES16 -> XLR AES/EBU -> Lavry Black DA10 -> XLR Mogami Gold -> Klein & Hummel O300
Earthwatts: You would get more improvement if using main ATX for P24 only. Your other ATX would power P4.
On 5V measurements, we can conclude that RAM timings does not adversely affect power consumption (no more than 35mA).
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