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PSU for an upcoming SFF project

post #1 of 11
Thread Starter 
Hey guys, so I have questions about my upcoming SFF project, and I need your opinions.

Planned setup:
Custom case
Air cooled Pentium G2120
Radeon 7850, stock clock
64GB SSD
This PSU: http://www.newegg.com/Product/Product.aspx?Item=N82E16817338045

So basically, that's it. It's going to be am extremely lightweight build. I estimate the total system power usage to be no more than 200W. My question is, will this PSU be adequate? I understand that typically, PSU manufacturers recommend choosing a PSU with at least 30% higher rating than your usage just to be on the safe side. But this PSU is almost half the price of any other ITX PSU, and I hope it will be enough. It does have 2 +12v rails @12.5A each - so that gives me some hope.

If I undervolt the CPU, RAM, and GPU, will that cut back on power draw significantly?
Edited by janas19 - 5/24/13 at 7:28am
post #2 of 11
Not sure, it has lots of bad reviews specially about it's noise.
The problem with PSUs with multiple 12V rails is getting confused with what to plug to what. Especially with a dGPU.
I would wait and save up some money for a better PSU if I were you.
post #3 of 11
http://www.overclock.net/t/183810/faq-recommended-power-supplies
There's a few quality TFX power supplies listed there.
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post #4 of 11
TFX is too big for this.

At this size you're essentially looking at 1U PSUs, which is what the Athena is.

Problem with these are that the fans they use to keep them cool are loud. They have to be to get proper airflow.

This is one of those things you trade off when going extremely small.

I would suggest going up to a TFX sized PSU which would also allow you to get a bigger cooler for the CPU and make it quieter.

Or get a Pico-PSU and go fully silent for the PSU. I can verify that a pico can run a Pentium + mATX board + 7790 + 4x3.5" HDDs + 2x2.5" HDDs. So you should be fine running it with a 7850 which only marginally uses more power.
     
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post #5 of 11
Thread Starter 
Quote:
Originally Posted by armourcore9brker View Post

TFX is too big for this.

At this size you're essentially looking at 1U PSUs, which is what the Athena is.

Problem with these are that the fans they use to keep them cool are loud. They have to be to get proper airflow.

This is one of those things you trade off when going extremely small.

I would suggest going up to a TFX sized PSU which would also allow you to get a bigger cooler for the CPU and make it quieter.

Or get a Pico-PSU and go fully silent for the PSU. I can verify that a pico can run a Pentium + mATX board + 7790 + 4x3.5" HDDs + 2x2.5" HDDs. So you should be fine running it with a 7850 which only marginally uses more power.
Quote:
Originally Posted by armourcore9brker View Post

TFX is too big for this.

At this size you're essentially looking at 1U PSUs, which is what the Athena is.

Problem with these are that the fans they use to keep them cool are loud. They have to be to get proper airflow.

This is one of those things you trade off when going extremely small.

I would suggest going up to a TFX sized PSU which would also allow you to get a bigger cooler for the CPU and make it quieter.

Or get a Pico-PSU and go fully silent for the PSU. I can verify that a pico can run a Pentium + mATX board + 7790 + 4x3.5" HDDs + 2x2.5" HDDs. So you should be fine running it with a 7850 which only marginally uses more power.

You hit the nail on the head - exactly the issues I've been struggling with. The problem with 1U PSUs isn't the power, it's the 40mm fan. TFX and SFF form factors both use an 80mm fan, which makes them enormously better.

I'm going to be creating a project I call PicoFX, or PFX for short. The basic idea is to have a full sized GPU in a pico sized form. If all goes well, I envision it being less than half the volume of the Sugo SG05.

Now that you know my plan, I'm curious about how you used a Pico-PSU with a 7790? You certainly must have molded it, I imagine, as the Pico-PSU doesn't have a PCI-E connector. Nor would an adapter fit. So can you please tell me what you mean?
post #6 of 11
I had to use adapters. Lots and lots of adapters. This is the kit that I use. It gives me 2xMolex and 2xSata for peripheral power. Essentially I used one of the molex and used an adapter: Molex --> PCI-e 6-pin. Then used a few splitters to end up with 6 Sata connectors for powering the HDDs.

I know someone out there will want to crucify me for using so many adapters and splitters. I ran a prime95 and burn in test for the cpu/gpu so they were maxed out and there were no issues.
     
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Hard DriveMonitorKeyboardPower
Samsung HD204UI LG L246WP Razer Blackwidow Ultimate PicoPSU-160-XT 
CaseMouseAudio
My desk Razer DeathAdder 3.5G Fiio E10 USB DAC 
CPUGraphicsRAMHard Drive
Intel i7-3615QM GT 650m Samsung Crucial M4 
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post #7 of 11
Quote:
Originally Posted by armourcore9brker View Post

I had to use adapters. Lots and lots of adapters. This is the kit that I use. It gives me 2xMolex and 2xSata for peripheral power. Essentially I used one of the molex and used an adapter: Molex --> PCI-e 6-pin. Then used a few splitters to end up with 6 Sata connectors for powering the HDDs.

I know someone out there will want to crucify me for using so many adapters and splitters. I ran a prime95 and burn in test for the cpu/gpu so they were maxed out and there were no issues.
Brilliant! thumb.gif
post #8 of 11
Thread Starter 
Quote:
Originally Posted by armourcore9brker View Post

I had to use adapters. Lots and lots of adapters. This is the kit that I use. It gives me 2xMolex and 2xSata for peripheral power. Essentially I used one of the molex and used an adapter: Molex --> PCI-e 6-pin. Then used a few splitters to end up with 6 Sata connectors for powering the HDDs.

I know someone out there will want to crucify me for using so many adapters and splitters. I ran a prime95 and burn in test for the cpu/gpu so they were maxed out and there were no issues.

That is an interesting approach, but given the power draw of the 7790, I can see it working. I'd assume only one HDD would be active when gaming, thus gaming load = 1155 Pentium + 7790 + HDD = 55W + 115W + 10W = 180W,within spec of the 192W converter?

The only issue I can see is there's a potential for voltage drop with each additional connector added.
Edited by janas19 - 5/25/13 at 12:26pm
post #9 of 11
I can run some multimeter tests for you to see what the voltages are at the end of the adapter chains.

For your use though, you won't need any adapters other than the one for the GPU.
     
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Intel Core i5 3450S Asus P8H77-I AMD HD7790 G.Skill Sniper  
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WD Scorpio Black OCZ Vertex II Samsung HD204UI Samsung HD204UI 
Hard DriveMonitorKeyboardPower
Samsung HD204UI LG L246WP Razer Blackwidow Ultimate PicoPSU-160-XT 
CaseMouseAudio
My desk Razer DeathAdder 3.5G Fiio E10 USB DAC 
CPUGraphicsRAMHard Drive
Intel i7-3615QM GT 650m Samsung Crucial M4 
Hard DriveOSMonitorPower
Seagate ST1000LM024 HN-M101MBB Windows 7 Ultimate 64-Bit 17.3" 1920x1080 Delta SADP-90FH D 90W 
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CPUMotherboardGraphicsRAM
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Hard DriveHard DriveHard DriveHard Drive
WD Scorpio Black OCZ Vertex II Samsung HD204UI Samsung HD204UI 
Hard DriveMonitorKeyboardPower
Samsung HD204UI LG L246WP Razer Blackwidow Ultimate PicoPSU-160-XT 
CaseMouseAudio
My desk Razer DeathAdder 3.5G Fiio E10 USB DAC 
CPUGraphicsRAMHard Drive
Intel i7-3615QM GT 650m Samsung Crucial M4 
Hard DriveOSMonitorPower
Seagate ST1000LM024 HN-M101MBB Windows 7 Ultimate 64-Bit 17.3" 1920x1080 Delta SADP-90FH D 90W 
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post #10 of 11
Thread Starter 
Quote:
Originally Posted by armourcore9brker View Post

I can run some multimeter tests for you to see what the voltages are at the end of the adapter chains.

For your use though, you won't need any adapters other than the one for the GPU.

Could you? That would be just awesome. I'd love to see the results! tongue.gif
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