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Do I really need 12V 2 18A?

post #1 of 10
10/12/12 at 5:19pm
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Looking to build HTPC, but wanting to use some low power parts. The mITX cpu/mobo combo is 1.5 Ghz dual core, fast enough to play movies, but I want to put a low power gpu in to offload the graphics work.

Looking at this gpu

It states required PSU must be 300W and have 12V line at 18A or higher.

Looking at this case which has a PSU that is 250W and 12V line at 16A.

I know they tend to over state the actual power usage, but how close would I be?
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The psuedo budget build
(16 items)
 
Home server
(13 items)
  		 
CPUMotherboardGraphicsRAM
Phenom II x3 720 ASUS M4N98TD EVO SLI Galaxy GTX 460 768MB GC G Skill Cheapo DDR3 10666  
Hard DriveHard DriveOptical DriveCooling
OCZ Solid 3 Seagate Sony IDE DVD-RW Corsair A-50 
OSMonitorKeyboardPower
Windows 7 Pro  Samsung T240HD  Logitech G15 Corsair TX750 
CaseMouseMouse PadAudio
Cooler Master HAF 932 Logitech G5  Steel Series Orange Giant Cloth Pad Logitech G35 
View all
CPUMotherboardGraphicsRAM
AMD Phenom X4 9500 Asus M3N78 Pro On board Corsair XMS2 DDR2 800 
Hard DriveHard DriveHard DriveHard Drive
Western Digital Velociraptor Samsung Sata Hitatchi Samsung 
Optical DriveCoolingOSPower
Polaroid USB DVD ROM Thermaltake TR2-R1 CentOS6 x86_64 Ultra 600W 
Case
Ultra X-Blaster 
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post #2 of 10
10/12/12 at 6:11pm
That graphics card pulls 15W, or 1.25A. With an i3, you're talking no more than 8A total draw for the entire system. Virtually any PSU could run it.



The power supply included with that case is not very good. Not god awful, not like that Zumax I just reviewed. But it does kind of suck, in terms of performance, efficiency, reliability, and noise. I recommend replacing it. SeaSonic and FSP have some ITX power supplies that would work great.
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post #3 of 10
10/12/12 at 6:19pm
Quote:
Originally Posted by Phaedrus2129 View Post

That graphics card pulls 15W, or 1.25A. With an i3, you're talking no more than 8A total draw for the entire system. Virtually any PSU could run it.
The power supply included with that case is not very good. Not god awful, not like that Zumax I just reviewed. But it does kind of suck, in terms of performance, efficiency, reliability, and noise. I recommend replacing it. SeaSonic and FSP have some ITX power supplies that would work great.

Anything but a Chinese PSU with two 3A diodes mounted to the secondary tongue.gif

Yeah, the PSU that comes with that case is a rebranded Allied PSU (check out my post about them a couple threads down) I deal with that PSU on a daily basis at work and they are horrible. The fan seizes after about a year, the efficiency is in the 60's, and there's no OTP so when the fan dies it'll run until something overheats and dies (which in most cases I've seen is the switching transistors). I have one at work powering a Pentium 4 3GHz, 2 sticks of RAM, 30W TDP GPU, and a USB boot drive for crying out loud and the thing kicks out heat as if it's powering a rig that's loaded up will dual GPU's and folding... I'd get something that Phaedrus suggested
Edited by Pentium-David - 10/12/12 at 6:23pm
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post #4 of 10
10/12/12 at 8:03pm
What, are Rosewill still using Deer for that unit? Crap, I thought they phased that junk out years ago.

Yeah, replacing that POS would be a #1 priority.
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post #5 of 10
10/13/12 at 12:56am
Quote:
Originally Posted by Phaedrus2129 View Post

What, are Rosewill still using Deer for that unit? Crap, I thought they phased that junk out years ago.
Yeah, replacing that POS would be a #1 priority.

Unfortunately, yes. it's pretty sad too, they have a fan controller but when the thing starts to get super hot, the fan doesn't even get any faster, it has to get very very hot for it to speed up, and the YC caps can't handle the heat. I've cracked one open and found every cap except one bulged...
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Thortech Thunderbolt 650W Antec 200 
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post #6 of 10
10/22/12 at 11:06am
Here's what happens when that PSU is used.



Edited by Pentium-David - 10/22/12 at 11:08am
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post #7 of 10
10/22/12 at 12:57pm
What was the usage period and pattern on that unit, and with what hardware?
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post #8 of 10
10/22/12 at 1:15pm
Quote:
Originally Posted by Original Sin View Post

What was the usage period and pattern on that unit, and with what hardware?

It was in an ISF running 24/7, powering a dual core Atom, 1 stick of DDR2 RAM, and a single 2.5" hard drive. It was used for about a year and 4 months, the sleeve bearing fan seized up and like mentioned above, it kept running until the switchers blew. It didn't take anything with it thankfully, probably because it was the primary that failed and not the secondary. And I might add, boy does this thing smell! See how the glue in it turned black?
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Thortech Thunderbolt 650W Antec 200 
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Hard DriveCoolingOSMonitor
500GB Seagate + 1TB Samsung Corsair H80 Windows 7 Ultimate 64 Samsung 23" 1920x1080 
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Thortech Thunderbolt 650W Antec 200 
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post #9 of 10
10/22/12 at 1:33pm
Yeah, that can't be put on the dust alone, it's strange..

Good thing it left everything else intact.. though looking at that secondary I can only imagine what kind of power was fed to the components.
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post #10 of 10
10/22/12 at 1:43pm
Quote:
Originally Posted by Original Sin View Post

Yeah, that can't be put on the dust alone, it's strange..
Good thing it left everything else intact.. though looking at that secondary I can only imagine what kind of power was fed to the components.

Yeah, they might be decent if they used a ball bearing fan and increased the efficiency 10% or more and after a recap. The efficiency is so rotten, just powering the atom system it kicks out above room temperature heat, and the case of the PSU gets warm.
Keeps me warm
(14 items)
  		  
CPUMotherboardGraphicsRAM
Core i5 2500K @ 4.4GHz Asus Sabertooth P67 HIS IceQ Radeon HD 7950 3GB 16GB G.Skill Ares @ 1600MHz 
Hard DriveCoolingOSMonitor
500GB Seagate + 1TB Samsung Corsair H80 Windows 7 Ultimate 64 Samsung 23" 1920x1080 
PowerCase
Thortech Thunderbolt 650W Antec 200 
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Keeps me warm
(14 items)
  		  
CPUMotherboardGraphicsRAM
Core i5 2500K @ 4.4GHz Asus Sabertooth P67 HIS IceQ Radeon HD 7950 3GB 16GB G.Skill Ares @ 1600MHz 
Hard DriveCoolingOSMonitor
500GB Seagate + 1TB Samsung Corsair H80 Windows 7 Ultimate 64 Samsung 23" 1920x1080 
PowerCase
Thortech Thunderbolt 650W Antec 200 
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  hide details  
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