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About OAudio

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  1. They are nice looking units but perhaps not very well suited to powering a quality DC ATX. The PSU's spec's show droop rate performance under load and in particular the ripple and noise specs would be a concern. And there can also be combined noise issues with an SMPS followed by DC ATX buck conversion. The specs on the supply linked show: Droop Rate (-xDx-R suffix) 50 mv/A Ripple & Noise 400 mv (Both for the 28v version). They are big figures for feeding a DC ATX in a server that's focused on sound quality. I spent quite some time a few yea
  2. Intel "client" level Optane SSDs go end of life this month. Just a heads up for anyone considering using an Optane drive and who has not heard about Intel's change of market strategy on Optane. I got a distributor bulleting late last year to saying some Intel SSDs were to go end of life in Q1. In the announcement recently are all of the "client" level 900p and 905p series Optane devices are withdrawn this month (Feb). Going forward the available high capacity, none hybrid, Optane drives are all to be "data centre" units which are significantly more expensive than the withdrawn 900
  3. GPU cooling is not a priority for the server builds I am working on, but the engineering of the GPU cooling system in the linked article looks really nice :-)
  4. Hi kyoya78, What a difference to the radiator on the other CPU. That's a nice looking CPU block !
  5. Hi VHS, Thanks for the interest, yes things have moved forwards. I wanted to see if the cooling system performed as per the thermal design I did. I couldn't wait any longer so I did do a trail fit a week ago. They are just about bang on the thermal design which was really nice to see and they look absolutely superb in the chassis. The coolers were made by an engineer with decades of work for a jet engine manufacturer, and it really shows. Its such a shame to shut them away inside the server chassis. They are back out of the server again and the fans are back in for n
  6. Hi Rossb, There is a lot of dogma about fans which really makes me 🙂sometimes. You would think they are a complete disaster the amount of attention that "fan-less" setups get, however the truth is that if you: run them slow so you are happy / can live with the with the sound noise levels, isolate them from the servers sensitive power (don't connect via the mother board headers), make sure that the fans ground is not referenced to the servers supplies, run fan wiring well away from the servers wiring and the motherboard etc, the sound quality
  7. Active rectifiers can provide real up tick in SQ, but to be more confident of them doing this, they need to be designed into a supply from the outset. When swopped into existing circuits, particually higher current LPSs which were designed with diode bridges originally, the impact on performance and sound quality is variable. For higher current capacity supplies at least, keep in mind that dropping in an active rectifier can generate a really very significant jump in peak ripple current in the transformer, rectifier and filter components. The 'on' resistance (Ron) of a
  8. Hi R1200CL, These are great coolers. I use the Supermicro versions in 2u size. Unfortunatly they are not efficient enough to the cool 3647 cpus passively. They are designed for server cases with fans and ducts to make sure the coolers see some forced air moving through them. Whilst working on the server for the moment I am still using the Supermicro versions of these coolers with electrically isolated fans. It's far easier to strip and reassemble the server with the Supermicro 2U coolers than with the new CNC coolers and heat pipe system installed. OA
  9. Hi Chris, No commercial offerings yet but the situation could change moving into next year so I will pm you for guidance.
  10. DC ATX supplies can put in good performances but PC's are current driven devices and at the current levels required DC ATX and other switched / buck supplies will only take you so far. Linear is perhaps the best route but it's a significant task developing them for ATX supplies as an application. CLC is attractive but can occupy a lot of space and needs to be carefully designed but can be done. We have gone for multiple linears with a list of special features in the supplies. Performance even at high(ish) currents is good and it shows in SQ achived. If you c
  11. It's a great review serise, looking forwards to part 6 !
  12. I have servers in the late stages of development, there are single and dual socket c621 varients. SQ is comparable with the Taiko. Of the single and dual socket setups the dual socket is definatly the most felxible. As ray-dude says, it's satifying to hear SQ benefits when data paths and software processes and priorities are well setup.
  13. @ray-dude great points. The sage archtecture diagram or equivalent for other dual CPU motherboard are very important inputs to working up affinity strategies. Another hint @kyoya78would be not to forget that that LTSB's kernel threads, many SW device drivers and other OS owned services cannot have their CPU affinities set by user performance tuning tools. These OS processes are scheduled by the OS across available cores on both CPU sockets, which can be challenging and needs consideration. Attaching your critical replay hardware (eg OS disk, USB ports) and setting core
  14. +1 here for the 665p Intel drives. Their SQ is usage dependant, which isn't really a suprise, but they are capable supporting very good sq when used for media storage.
  15. Try 1 dimm per channel and then 2 just to check out any sound quality change. Often the extra dimm on a channel dosent add anything or makes sound a little worse, but that might not be the case with your board 😉
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