I recently pos­ted abi­out my search for a new stor­age serv­er case. My next search involves find­ing a suit­able 電源ユニット! 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. 但し, if you have space and you want sys­tems to be cool, 静か, and effi­cient then large is still the way to go.

My cur­rent serv­er has the excel­lent Cor­sair HX520 電源ユニット これは私の周りのために持っていました 10 年. This mod­u­lar 電源ユニット 持っています 5 AUX con­nect­ors which can take SATA またはモレックスケーブル. 私は余分です SATA ケーブルと持っています 1 モレックスケーブルと 4 SATA 私は両方のケースファンに電力を供給することができますケーブル (モレックス) そして、まで 16 HDDの (4 X 4 SATA ケーブル). 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 電源ケーブル (silly giv­en that a sig­ni­fic­ant major­ity of people use either 0 若しくは 1 GPUは, 確かに使うと非常に少ないです 2, おろか 3!) しかし、それらの多くは、唯一持っています 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 電源ユニット would be com­plete overkill and would also be oper­at­ing at only 10% capa­city which is far below the optim­um effi­ciency. A 400W 電源ユニット 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 プラスゴールド (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. aがあります 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 アンペア
  • Star­tup Cur­rent +5V: 0.60 アンペア
  • Star­tup Power (トータル): 16.92における
  • 読み書き: 10.70 ワッツ
  • 遊休: 8.20 ワッツ
  • 待機する: 1.30 ワッツ
  • 睡眠: 1.30 ワッツ

The total spin up power at 17W is fairly typ­ic­al. A WD赤3TBは15Wを使用しています.

ととも​​に 16 of these drives there would be a max­im­um draw of 48W from the 5v line and 223W from the 12V line (271W合計). 125WはAに許可されたとしてもで 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. チェックへの最終的なものであるということ 電源ユニット 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) 私の古いHX520が持っているということです 3 12V lines which each have a max­im­um sup­ply of 18A which means 216W. のみ 1 私がスピンアップしてみましたので、もしこれらの駆動力のために使用されています 16 HDDs sim­ul­tan­eously I would be slightly over my power budget. もちろん私は千鳥スピンアップを持っていないと私しかいません 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 電源ユニット 以下のために評価されてい. Once we know this it becomes appar­ent that there really is no need for a kilo­watt 電源ユニット 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. そうでない場合は、これまで目を覚ますとき、あなたは長いREPONSE遅延を取得します! 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 ドライブ, 1 RAIDカード, と 2 TVカード. It typ­ic­ally draws about 125W at the sock­et, with all the drives spin­ning and the テレビ stream­ing. No doubt if I ham­mer the serv­er it will go high­er, but for a glor­i­fied NAS a kilo­watt power sup­ply is utterly overkill. あなたは千鳥スピンアップが有効になっていない場合は、時計に重要なのは、消費電力であります (which you can prob­ably only enable with a RAID カード). 私は千鳥スピンアップを持っています, と 2 私の 12 ドライブは問題アップスピンを持っていないのSSDです. Assum­ing the new serv­er also draws around 125W then a 500W 電源ユニット なります 25% ロード, 1000Wながら 電源ユニット なります 12.5% ロード. Giv­en an equal 80 plus rat­ing the 500W 電源ユニット is almost cer­tain to be more effi­cient at this load, as well as being a reas­on­able price to start with.

私は、メインブランドで優れた外観を持っていました 電源ユニット man­u­fac­tur­ers (Cor­sair, Season­ic, EVGA, Antecの, FSP, Bequiet, Sil­ver­stone, Thermal­take, Cool­er­Mas­ter, XFX, フラクタルデザイン, Ener­max) そして、私が見つけることができる最も近いの下のリストを作りました. 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 (750における; £75; 80+ ゴールド)
  • EVGA Super­NOVA 650 G + (650における; £85; 80+ ゴールド)
  • EVGA 650 BQ (650における; £74; 80+ ブロンズ)

これまでのところ 電源ユニット’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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