Need new power suppy advice

NeoK182

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So planning on doing a massive upgrade to my computer soon and i've recently done some experiemtnging and figured that that basically 90% of my PC's noise and a good 70% of the heat is coming from my power supply.

I have an Alienware P2 case which from my research includes a 700watt power supply but i have no idea the brand or anything other than that.

I live in south florida, and my house is kept between 75-78 degrees though my computer can easily knock the temperature in my room up to 80-85. Just leaving it on 2-3 hours web browsing heats up the room by a few degrees if the AC isn't running or it isn't cool outside.

Now, i know that any gaming machine is going to put out heat and noise, but since my power supply is whats generating most of it, i want to make a change here and do the most that i can to lower the volume and heat output.

So i have three questions.

1) How can i find out how big of a supply i need? i've gone on sites like cyberpower and setup the sytem there and it looks like a 500 or 550 will be fine but i'd like to be sure.

2) With the temperatures my room is, should i go with a fanless?

3) if not a fanless than a recommendation for a quiet and cool power supply would be very appreciated. I'm currently looking at this one on Amazon.
Amazon.com: Cooler Master eXtreme Power Plus 500w Power Supply (RS500-PCARD3-US): Electronics

Lastly, the area for the power supply in the P2 case is completely covered except for the rear of the computer and the opposite side with the fan, the bottom is covered, and i've noticed that in many power supplies and fanless including the one i posted have fans on the top, and in my case it wouldn't get any ventilation on the top.

if i have to i'll take the thing apart and see what it's like inside, but i'm hoping to avoid that until i actually get a new one.

Long post i know but thank you in advance to anyone who can help me out here.
 

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Thanks for the reply, if i did it correctly it came up with 406 watts. which sounds about right because the cyberpower estimate put me at 395 and that didn't seem to add hard drives, optical drives, and my card reader.

Though it is a gaming PC, i'm only running one video card and don't have anything super fancy in it, just basic good hardware.
 

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Windows 7 Home Premium
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My Computer My Computer

At a glance

Win 10 Pro 64Intel Core i7 960 @3.20 GHz24.0 GB DDR3EVGA GTX 750Ti
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom Build
OS
Win 10 Pro 64
CPU
Intel Core i7 960 @3.20 GHz
Motherboard
MSI MS7522
Memory
24.0 GB DDR3
Graphics Card(s)
EVGA GTX 750Ti
Monitor(s) Displays
LG E2341 23 Inch
Screen Resolution
1920x1080
Hard Drives
1TB Western Dgital 1002FAEX-00Y9A0
1TB Hitachi HDS721010CLA322
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700 Watt
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Haf 912
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Logitech MK710
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NeoK182,
It my opinion that for a modern single card high end build go with a premium modular PSU and stay with 600 watts and above. If you see yourself holding this build and maybe adding another high card as well as maxing out case cooling and the like then I would advise to just future proof yourself with jumping to 850-1100 watts and move on. Stick with Seasonic, Corsair and other big name mfgr's.
 

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Asus USB 3 & sata 6 PCIe card
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Drobo 5N advanced NAS
currently a radeon 6850 1gb.

If theres a 700watt that's quiet and cool i'll gladly go for it but it seems to me that the higher the wattage the more heat and noise the card may put out. at least 600 i'd probably go for. I'll be honest, haven't done that much looking yet since i don't know much about power supplies.

I'm not the type of gamer that wants to run things at 4k resolution in 3D on ultra-insane-godly settings. I just like to run things on high-max and get 30-60fps. I also play console games so i don't want my PC to look so godly that i can never go back to a console lol
 

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the wattage of the power supply makes no difference in how much your computer uses. It is just the capability of the supply and will only put out what the computer requires. If you buy an 800Watt power supply and your computer only requires 350 watts, the power suply will only put out 350 watts. Also, a power supply larger than your minimum for your computer will not work it as hard, will run cooler and will last longer. I would try to stau within about 70% of it's maximum. I would also recommend a good quality power supply. I would recommend Corsair, Seasonic or Antec. Those are excellent quality supplies.
 

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Thank you all for your help.

Currently reading dozens of amazon reviews to see how hot and noisy different ones are.
 

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currently a radeon 6850 1gb.

If theres a 700watt that's quiet and cool i'll gladly go for it but it seems to me that the higher the wattage the more heat and noise the card may put out. at least 600 i'd probably go for. I'll be honest, haven't done that much looking yet since i don't know much about power supplies.

I'm not the type of gamer that wants to run things at 4k resolution in 3D on ultra-insane-godly settings. I just like to run things on high-max and get 30-60fps. I also play console games so i don't want my PC to look so godly that i can never go back to a console lol

My 700 watt PS is quiet. It is a bottom mount but it only has one fan. Like essenbe it will only put out the wattage that is required for your system.
 

My Computer My Computer

At a glance

Win 10 Pro 64Intel Core i7 960 @3.20 GHz24.0 GB DDR3EVGA GTX 750Ti
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom Build
OS
Win 10 Pro 64
CPU
Intel Core i7 960 @3.20 GHz
Motherboard
MSI MS7522
Memory
24.0 GB DDR3
Graphics Card(s)
EVGA GTX 750Ti
Monitor(s) Displays
LG E2341 23 Inch
Screen Resolution
1920x1080
Hard Drives
1TB Western Dgital 1002FAEX-00Y9A0
1TB Hitachi HDS721010CLA322
PSU
700 Watt
Case
Haf 912
Cooling
Fans
Keyboard
Logitech MK710
Mouse
Logitech M705
Internet Speed
Cable
Antivirus
AIS 2015 .10.0.2225
Browser
Firefox 49
Other Info
MalwareBytes Anti-Rootkit utility

My Computer My Computer

At a glance

Windows 7 Ultimate 64i7 3770k OC'd 4.6 @ 1.17v, also FX 8120 & i5 ...32 gb G.Skill Sniper DDR3 10-12-12-31 @ 2133XFX Radeon 7870 2GB DDR5
Computer type
PC/Desktop
Computer Manufacturer/Model Number
A blend of brains, brawn and dumb luck.
OS
Windows 7 Ultimate 64
CPU
i7 3770k OC'd 4.6 @ 1.17v, also FX 8120 & i5 miniITX
Motherboard
MSI P67A-GD80 b3
Memory
32 gb G.Skill Sniper DDR3 10-12-12-31 @ 2133
Graphics Card(s)
XFX Radeon 7870 2GB DDR5
Sound Card
Sound Blaster Z Series Card
Monitor(s) Displays
(2) LG LED 23" 1920 x 1080 2ms Monitors via mini d-port
Screen Resolution
1680 X 1050 p
Hard Drives
Samsung 256 gb 830 SSD sata III
(1) 1 tb WD Black
(2) 1 tb Hitachi deskmates/sata II
(2) 1 tb WD green/sata II
(2) 3 tb Seagate Barracuda
(1) 120 gb OCZ Vertex SS
(1) Drobo 5N w/5 Seagate 3tb
PSU
EVGA modular 1000G2 80% gold rating & APC 1200 RS
Case
CoolerMaster Storm Styker
Cooling
7 case fans 140mm & 120mm, NZXT Kraken X60
Keyboard
(2) Logitech Illuminated Keyboards (1) usb (1) wireless
Mouse
Logitech G700 & T-BC21 - nano nx for the laptop
Internet Speed
Basic 120mbps down
Antivirus
Trend Micro Titanium Max Security & Malwarebytes Premium
Browser
Chrome and IE 10
Other Info
5 Noctua case fans + 3 Noctua in p/p on NZXT cooler
Integrated hot swap drive bays for 2.5" Drives
(2) Lite-on dvd/cd/Blu Ray optical 22X
Integrated fan controller and led on/off
HP Officejet Pro 8630 all-n-one
Hot-swappable 3.5" hard drive bay
Netgear Nighthawk router
Asus USB 3 & sata 6 PCIe card
Vantec IDE to sata adptr./Ultra sata adptr
Lenovo L420 i5 lappy with m sata
Drobo 5N advanced NAS
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