I recently posted abiout my search for a new storage server case. My next search involves finding a suitable PSU! It seems in recent years it has got much harder to find the type of hardware I like to use, probably because the fashion has been to go smaller and sleeker which is generally more possible in this era of improved performance-per-watt devices. tuttavia, if you have space and you want systems to be cool, silenzioso, and efficient then large is still the way to go.
My current server has the excellent Corsair HX520 PSU che ho avuto per circa 10 anni. This modular PSU ha 5 AUX connectors which can take SATA o cavi Molex. Ho avuto in più SATA cavi e hanno 1 il cavo molex e 4 SATA cavi che mi permette al potere entrambe le ventole (molex) e fino a 16 HDD (4 x 4 SATA cavi). I currently have 12 SATA drives powered with a little bit of spare capacity.
I would be very happy with another HX520 power supply for my new server but of course being a 10 year old design it is no longer available, and I haven’t been able to find one second hand so I have been searching for something equivalent. The problem is that modern designs seem obsessed with providing silly numbers of GPU cavi di alimentazione (silly given that a significant majority of people use either 0 o 1 GPU, e molto pochi in effetti utilizzare 2, per non parlare 3!) ma molti di loro hanno solo 3 AUX connectors with even the reasonably high power models only offering 4.
It is possible to get models with 5 or more AUX sockets but these are typically £200 or more for 1000W or more. My current server pulls 125W at the socket so this sort of PSU would be complete overkill and would also be operating at only 10% capacity which is far below the optimum efficiency. A 400W PSU would be far more suitable (to give headroom for the systme under full load and for the drive spin up power draw at boot up).
One final frustration is that even if I am able to find a much older model second hand it is likely to be significantly less efficient that a modern design. With the server running 24.7 efficiency does make a difference. Is it too much to ask to find a modern equivalent of the HX520 with an 80 più oro (or better) rating for price of around £60?
Bare in mind there is a lot of misinformation about the amount of power required for systems with multiple HDDs. C'è un good thread on SuperUser where some typical figures are given and a similar discussion on Tom’s Hardware forums where a typical example is given…
- WD Caviar Black (WD2001FASS)
- Startup Current +12V: 1.16 Amps
- Startup Current +5V: 0.60 Amps
- Startup Power (totale): 16.92In
- Leggere scrivere: 10.70 Watts
- Inattivo: 8.20 Watts
- Pausa: 1.30 Watts
- Dormire: 1.30 Watts
The total spin up power at 17W is fairly typical. Un WD Red 3TB usa 15W.
Con 16 of these drives there would be a maximum draw of 48W from the 5v line and 223W from the 12V line (271totale W). Anche con 125W consentito per un CPU under full load and another 100W for the rest of the system, the total maximum power draw is still only 471W. And let’s remember that the cpu and system will not be drawing maximum power at bootup time when the drives are at maximum. L'ultima cosa da controllare è che il PSU can supply enough power on the 5V line and 12v line as these each have a maximum rating. Even my old Corsair HX520 can provide 24A at 5V which is a total of 120W (Basic secondary school physics lessons will tell you that Power = Current x Voltage) which is 2.5x the demand of this hypotetical 16-drive system.
In fact the area I would have to be careful of (if I didn’t have staggered spin up) è che il mio vecchio HX520 ha 3 12V lines which each have a maximum supply of 18A which means 216W. Solo 1 di questi è utilizzata per l'azionamento quindi se ho cercato di spin up 16 HDDs simultaneously I would be slightly over my power budget. Certo che avere sfalsato spin-up e ho solo 10 spinning-rust based drives so I am well within the limits. The lesson is clear though — in any build the limiting factor is more likely to be the maximum power provided per 12v line and not the total power the PSU è valutato per. Once we know this it becomes apparent that there really is no need for a kilowatt PSU for this sort of system, but having staggered spin up is immensely valuable and even with that, it is worth paying attention to the maximum rating of each 12v line, and the maximum rating for the 5v supply. Most modern PSU now use a single 12v line which can supply 50A+ which solves this problem.
It is worth noting that using “green” drives that like to go to sleep could cause issues if they all try to spin up at once. Se non lo fanno, allora si otterrà un lungo ritardo reponse quando mai la sveglia! I recommend using NAS grade (or better) HDDs for a storage system of this kind. Some good information and graphs about start-up power are available at 45Drives.com
My current server has 12 unità, 1 scheda RAID, e 2 schede TV. It typically draws about 125W at the socket, with all the drives spinning and the TV streaming. No doubt if I hammer the server it will go higher, but for a glorified NAS a kilowatt power supply is utterly overkill. La cosa fondamentale da orologio è il potere disegnare, se non si dispone di sfalsato spin-up abilitato (which you can probably only enable with a RAID scheda). Io ho sfalsato spin up, e 2 della mia 12 unità sono SSD che non hanno il problema di spin up. Assuming the new server also draws around 125W then a 500W PSU sarà al 25% carico, mentre un 1000W PSU sarà al 12.5% carico. Given an equal 80 plus rating the 500W PSU is almost certain to be more efficient at this load, as well as being a reasonable price to start with.
Ho avuto uno sguardo buono al di marca principale PSU manufacturers (Corsair, Seasonic, EVGA, Antec, FSP, Bequiet, Silverstone, Thermaltake, CoolerMaster, XFX, fractal design, Enermax) e fatto la lista di sotto dei più vicini sono riuscito a trovare. Most manufacturers don’t offer anything at all below 650W with 5 or more aux connectors. I’ve included a 750W Corsair as I’ve seen it on offer at a similar price to 650W models frequently.
Possible new models
- Corsair RM750 (750In; £ 75; 80+ oro)
- EVGA SuperNOVA 650 G + (650In; £ 85; 80+ oro)
- EVGA 650 BQ (650In; £ 74; 80+ bronzo)
Finora il PSU’s I am aware of to search for second hand are…
- Corsair HX520
- Corsair HX620
- Corsair HX550
- Corsair HX650
- Seasonic 660XP2
- Seasonic 650KM3
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