Overclock.net › Forums › Specialty Builds › Small Form Factor Systems › itx power supply questions
New Posts  All Forums:Forum Nav:

itx power supply questions

post #1 of 12
Thread Starter 
What can I say PSU always confuse me .wheee.gif

I would like to use the 250 watt PSU's I already have and save that $89-$100 per computer if at all possible. I have two PSU questions:

1) Just looking at the pictures in reviews most the new z77 itx boards this year have a 24 pin power and a 8pin power plug where the old boards last year had a 24 and 4 pin like for my PSUs , so what is the difference in the 8 pin compared to the four pin (besides the obvious pin numbers) I assume this means I have to change all my PSU's now????


2) How big of PSU do I really need , maybe I am adding up the numbers wrong or leaving something out but I come up with about 220PSU BUT I have tried several PSU calculates and get 350 to 400................ what am I figuring wrong?
* Ares series 16gb ram .......1.5V each....(48 watts figured).......... (2x8gb)
* I7-3770K......................................................77 watts
* fans................................................................6 watts
* Seagate Momentus XT 750GB.............. 50 watts -- HDD/SSD hybrid drive
* motherboard..............................................39 watts .. (just guessing I can't find any real specfic info of power usage on MOBO's)
* PCI video card..............................................0 watts -- I don't have room for video card that why I have to use the more expensive Intel
* USB................................................................0 watts --- besides a flash drive now and then all usb items have separate power
* dvd/cd burner drive......................................? watts ---model TS-L633 unsure of power usage ,this has limited use for loading/burn
_..........................................................................._________
>>>>>>>>>>>>>>>>>>>>>>>>>>total............ 220 watts


Reference : all my PSU's are Athena Power FlexATX250W model AP-MFAT25
it has a 20 pin with a extra four pin that attaches then a second four pin for the mother board so am not even sure if these
will work with the new Z77, H77, B77 itx motherboards



Man those AMD prices really have me spoiled. Now I'm trying to do some intel builds an it seems expensive, ever thing seems to be a extra $100 for about a $400 more increase per computer price with a intel build but there is no am3+ sockets for itx that could find
post #2 of 12
Lol a SSD/HDD will never draw 50W of power. tongue.gif

Both the 24 pin and 8 pin can be run on 20 pins and 4 pins. Just don't expect to put any extra power into it.

Why not just use AMD's APU? That'd have better integrated graphics and be just fine for other tasks. Spending money (and power) on a 3770K is a waste at this level.
     
CPUMotherboardGraphicsRAM
Intel Core i5 3450S Asus P8H77-I AMD HD7790 G.Skill Sniper  
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 
MouseAudio
Logitech M505 Fiio E10 
  hide details  
Reply
     
CPUMotherboardGraphicsRAM
Intel Core i5 3450S Asus P8H77-I AMD HD7790 G.Skill Sniper  
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 
MouseAudio
Logitech M505 Fiio E10 
  hide details  
Reply
post #3 of 12
what is the purpose for these machines? as armourcore9brker have mentioned, a 3770k is a complete waste of budget unless this is going to be a 24/7 folding machine or some other kind of light weight server. the momentus is also a waste of $, that budget can be put into better use elsewhere.

if you intend to do ANY kind of gaming on this box, you'd be better off with an APU. wait for trinity is what i would recommend.
post #4 of 12
Thread Starter 
Quote:
Originally Posted by armourcore9brker View Post

Lol a SSD/HDD will never draw 50W of power. tongue.gif

well I could not find a exact power usage amount for that drive so I allot 50 watt since that is what the PSU calculators added for a hard drive, your saying I allowed to much power (better then to little I guess) any idea what amount to figure it will draw under load?

Quote:
Originally Posted by armourcore9brker View Post

Both the 24 pin and 8 pin can be run on 20 pins and 4 pins. Just don't expect to put any extra power into it.

so if I have one 20+4=24pin and the extra 4 pin plug instead of 8 pin plug it will still run with my current PSU that's good news


Quote:
Originally Posted by armourcore9brker View Post

Why not just use AMD's APU? That'd have better integrated graphics and be just fine for other tasks. Spending money (and power) on a 3770K is a waste at this level.

humm well I was excited when I first heard about the A10 piledriver and FM2 sockets coming out but have seen limited reviews that I have found to read , there lower then other amd power usage and graphics was appealing as was the amd prices normally falling much cheaper then intels. My reasoning was first its a longer wait (been waiting as is), second is power usage form what I have read and heard is better with intel which I like particularly on the SFF and the biggest reason was to my understand that while the apu's have decent graphics as a standalone they are much weaker on the CPU side of it then a fx-8150 or a I7 cpu and for what I want to use the computer for I need a stronger cpu for complex calculation and as much ram as possible (which unfortunately is only 16mbs in itx but that is better then last years 8mbs)
If there are flaws in my thinking about there A10 piledrivers release date, prices, cpu ability, power usage or anything else please let me know
post #5 of 12
Thread Starter 
Quote:
Originally Posted by psyclum View Post

what is the purpose for these machines? as armourcore9brker have mentioned, a 3770k is a complete waste of budget unless this is going to be a 24/7 folding machine or some other kind of light weight server. the momentus is also a waste of $, that budget can be put into better use elsewhere.
if you intend to do ANY kind of gaming on this box, you'd be better off with an APU. wait for trinity is what i would recommend.

no gaming I use this itx for regular browsing , photos etc etc like everyone else then also run cad and cam work these are teh main programs that seem to take up ram and require cpu individual parts are not band but assembly, fitting ,nesting etc all are a problem and thus the reason for larger cpus.

I know the Z77 boards and the K chips cost a little more but not so much (I was comparing prices in general) while I am not sure if I will overclock it right away I would like the ability to do it later

I use a short 1U server case and runs 12 14 hours a day on average
post #6 of 12
Quote:
Originally Posted by goldhunter2 View Post

no gaming I use this itx for regular browsing , photos etc etc like everyone else then also run cad and cam work these are teh main programs that seem to take up ram and require cpu individual parts are not band but assembly, fitting ,nesting etc all are a problem and thus the reason for larger cpus.
I know the Z77 boards and the K chips cost a little more but not so much (I was comparing prices in general) while I am not sure if I will overclock it right away I would like the ability to do it later
I use a short 1U server case and runs 12 14 hours a day on average

you gonna run CAD/CAM on an ITX and w/o a vid card?

most CAD/CAM machines use a workstation (ECC memory + quadro or fireGL) you sure you don't want a 4U or a 5U chassis for this project?
post #7 of 12
Thread Starter 
yep pretty sure , I have some full size towers I also use some times which a 4U would be about the physical same size which provide a whole other issue for me , when I started using some 1U itx server chassis as work stations and found I even can do small single parts in cad stuff on them , it may not be what is normally used but I am pretty sure that I want to stick with this case most everything else has become option. I would like the twin cpu availability of a server board but don't think that is a option with the SFF so I am just trying to figure power requirements for what is actual a accessible option for me
post #8 of 12
well... 1U chassis is VERY bad on cooling.(lack of room for good CPU cooler) so to be honest, you'd need a CPU that is in the 35 to 45 watt range rather then a 77 watt chip... and it's gonna be LOUD since you can only use 40mm fans in a 1U chassis...
post #9 of 12
Thread Starter 
not to argue the point but I need the cpu strength/power more then I need the quite , also have some ideas of cooling so I am not overly concerned at this time about it

what about the original power figures question , what am I figuring incorrectly to get such a big difference for the online PSU calculators?
post #10 of 12
Quote:
Originally Posted by goldhunter2 View Post

well I could not find a exact power usage amount for that drive so I allot 50 watt since that is what the PSU calculators added for a hard drive, your saying I allowed to much power (better then to little I guess) any idea what amount to figure it will draw under load?

-snip-

If there are flaws in my thinking about there A10 piledrivers release date, prices, cpu ability, power usage or anything else please let me know

That'll draw around 3.8 watts at load.
Trinity (using piledriver cores) will launch in may but do not expect and desktop parts until Aug/Sept.

Just stick with the Intel. I did some more research and for CAD applications, a powerful CPU is more important that a GPU (unless you're using GPU acceleration).
Quote:
Originally Posted by goldhunter2 View Post


I know the Z77 boards and the K chips cost a little more but not so much (I was comparing prices in general) while I am not sure if I will overclock it right away I would like the ability to do it later

Use a non-k processor since I would NOT overclock if your can't even fit the pin requirements. If these are for a corporate environment (just guessing) overclocking will only lead to instability and is not worth the hassle.

Quote:
Originally Posted by goldhunter2 View Post

what about the original power figures question , what am I figuring incorrectly to get such a big difference for the online PSU calculators?

PSU calculators take a lot of different factors into account. Mainly it is because they want to take the safe route. What happens if they say use a 200W and someone buys a POS 200W and blames them? It'd be easier to have someone buy a 300-350W and reduce the chances of blowing something up.
Edited by armourcore9brker - 4/24/12 at 8:23am
     
CPUMotherboardGraphicsRAM
Intel Core i5 3450S Asus P8H77-I AMD HD7790 G.Skill Sniper  
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 
MouseAudio
Logitech M505 Fiio E10 
  hide details  
Reply
     
CPUMotherboardGraphicsRAM
Intel Core i5 3450S Asus P8H77-I AMD HD7790 G.Skill Sniper  
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 
MouseAudio
Logitech M505 Fiio E10 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Small Form Factor Systems
Overclock.net › Forums › Specialty Builds › Small Form Factor Systems › itx power supply questions