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Is my selected PSU man enough for my first build? Would like reassurance please.

post #1 of 11
Thread Starter 
Hi OCN members,

I've just started pulling the trigger on parts for my very first build and would like to seek a little reassurance that I've chosen a sufficient PSU for my first system before I go ahead and buy it. It must be an SFX PSU and fully modular as I'm building in a mini-ITX case, and I have no plans to overclock (even though I've included the OCable version of the GPU in my list, as it seems to be cheaper than the non-OC'd!)

I've been recommended Corsair's units in preference over Silverstone's offerings and they offer either a 450W (chosen below) or 600W unit. PCPartpicker rates my build at 280W and the Cooler Master site calculator estimated 290W, so I think I should be fine...still, it would just be really good to get some confirmation from those more experienced in the field on such an important part of the build! wink.gif

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-7500 3.4GHz Quad-Core Processor (£173.94 @ Aria PC)
Motherboard: MSI B250I GAMING PRO AC Mini ITX LGA1151 Motherboard (£96.85 @ More Computers)
Memory: Kingston FURY 8GB (2 x 4GB) DDR4-2400 Memory (Purchased For £63.58)
Storage: Samsung 850 EVO 250GB M.2-2280 Solid State Drive (Purchased For £86.99)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (Purchased For £41.98)
Video Card: Asus Radeon RX 480 8GB ROG STRIX Video Card (£229.99 @ Aria PC)
Case: Silverstone RVZ01B Mini ITX Desktop Case (Purchased For £74.99)
Power Supply: Corsair SF 450W 80+ Gold Certified Fully-Modular SFX Power Supply
Optical Drive: LG GS40N DVD/CD Writer (£30.48 @ Ebuyer)
Total: £902.27
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-04-21 17:16 BST+0100

Thanks so much for any advice and help you can offer, I'd be very grateful!
post #2 of 11

PCPPartPicker always gives wattage estimates that are higher than the actual, so you're looking at a bit of overkill. ;) The estimates are always unrealistic.

It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
  hide details  
Reply
post #3 of 11
Gold rating means it should be at least 87% efficient so 450watts x.87 is still 391 which is plenty given your calculated estimates. If you would ever want to upgrade certain parts like deciding you want to crossfire then you might need to get a higher wattage at that point to support it.
post #4 of 11
Quote:
Originally Posted by Lobuttomize View Post

Gold rating means it should be at least 87% efficient so 450watts x.87 is still 391 which is plenty given your calculated estimates. If you would ever want to upgrade certain parts like deciding you want to crossfire then you might need to get a higher wattage at that point to support it.

 

The efficiency of a PSU has nothing to do with how much power it can deliver to a computer. It just refers to how much power is lost as heat when it's converting the Alternating Current from the wall outlet into Direct Current for the computer.

 

In other words, it doesn't mean "this PSU can only deliver ~90% of its advertised capacity". It just means that it's around 90% efficient on average, but again it has nothing to do with the output capacity.


Edited by TwoCables - 4/21/17 at 10:00am
It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
  hide details  
Reply
It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
  hide details  
Reply
post #5 of 11
Thread Starter 
Quote:
Originally Posted by TwoCables View Post

PCPPartPicker always gives wattage estimates that are higher than the actual, so you're looking at a bit of overkill. wink.gif The estimates are always unrealistic.

Oh, hey TwoCables! How are you? I'm finally finding my way around the forums thanks to your help, haha! smile.gif That's reassuring to hear, thanks so much!
Quote:
Originally Posted by Lobuttomize View Post

Gold rating means it should be at least 87% efficient so 450watts x.87 is still 391 which is plenty given your calculated estimates. If you would ever want to upgrade certain parts like deciding you want to crossfire then you might need to get a higher wattage at that point to support it.

Thankyou so much for your input Lobuttomize, I appreciate it. I had read there are calculations like you just showed to help ascertain wattages for PSUs, but my brain just melted when I tried to understand the explanations I read...maths has never been my strong suit biggrin.gif I'll never be able to crossfire in this tiny case even if I wanted to, so I should be safe, haha. Thanks again!
post #6 of 11
Quote:
Originally Posted by madhamster View Post


Oh, hey TwoCables! How are you? I'm finally finding my way around the forums thanks to your help, haha! smile.gif That's reassuring to hear, thanks so much!
Thankyou so much for your input Lobuttomize, I appreciate it. I had read there are calculations like you just showed to help ascertain wattages for PSUs, but my brain just melted when I tried to understand the explanations I read...maths has never been my strong suit biggrin.gif I'll never be able to crossfire in this tiny case even if I wanted to, so I should be safe, haha. Thanks again!

 

But he's wrong, madhamster.

 

Anyway, I'm pretty well thank you! I'm very glad to see you. :) Navigating this place is fun. lol


Edited by TwoCables - 4/21/17 at 10:03am
It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
  hide details  
Reply
It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
  hide details  
Reply
post #7 of 11
Quote:
Originally Posted by TwoCables View Post

The efficiency of a PSU has nothing to do with how much power it can deliver to a computer. It just refers to how much power is lost as heat when it's converting the Alternating Current from the wall outlet into Direct Current for the computer.

In other words, it doesn't mean "this PSU can only deliver ~90% of its advertised capacity". It just means that it's around 90% efficient on average, but again it has nothing to do with the output capacity.
My bad, incorrectly remembered the power factor of .9 at full load and kind of mixed it in with the actual ratings.
post #8 of 11
Quote:
Originally Posted by Lobuttomize View Post


My bad, incorrectly remembered the power factor of .9 at full load and kind of mixed it in with the actual ratings.

 

I don't know what you mean. A good continuous-rated PSU like this one should be able to deliver its full advertised wattage continuously provided the PSU's temperature doesn't exceed the rating (which is 40°C for the SF450). At that temperature and above, the capacity begins to diminish until the temperature goes back down.

It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
  hide details  
Reply
It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
  hide details  
Reply
post #9 of 11
Quote:
Originally Posted by TwoCables View Post

I don't know what you mean. A good continuous-rated PSU like this one should be able to deliver its full advertised wattage continuously provided the PSU's temperature doesn't exceed the rating (which is 40°C for the SF450). At that temperature and above, the capacity begins to diminish until the temperature goes back down.
At least .9*
post #10 of 11
Quote:
Originally Posted by Lobuttomize View Post


At least .9*


Let's keep it simple. He has 450W of power.

It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
  hide details  
Reply
It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
  hide details  
Reply
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