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help on power supply

post #1 of 26
Thread Starter 
My new case i have coming in i bought tonight is a JPAC COBB black/red Micro ATX it has 4 fan locations on top 2 on back and 3 on side 1 on other side close to the bottom of case. its dimensions are
21"D x 19.5"H x 10 " Width its kinda big. you can see pics of it here http://cgi.ebay.com/ws/eBayISAPI.dll...m=170287916321

My stuff to be inside:
Biostar G31M7TE Intel G31
Q8200
XFX 98000 GTX
4gb Corsair DDR2 800mhz
700w rocketfish- good enough?

how cool will it be with 1 80mm led fan on the side close to the bottom of the case my 3 92mm fans on the 9800 and its stock gpu cooler on the card and stock fan on the Q8200 and the room in the case helps.
Edited by jeremygj - 12/22/08 at 6:28pm
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post #2 of 26
Cool as in "dang your computer looks awesome"
or temperature wise

Temps should be fine as long as you make sure your fans generate a general direction of airflow and don't put more than a grain of rice amount of thermal paste on your CPU.
    
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post #3 of 26
Quote:
Originally Posted by jeremygj View Post
My new case i have coming in i bought tonight is a JPAC COBB black/red Micro ATX it has 4 fan locations on top 2 on back and 3 on side 1 on other side close to the bottom of case. its dimensions are
21"D x 19.5"H x 10 " Width its kinda big. you can see pics of it here http://cgi.ebay.com/ws/eBayISAPI.dll...m=170287916321

My stuff to be inside:
Biostar G31M7TE Intel G31
Q8200
XFX 98000 GTX
4gb Corsair DDR2 800mhz
700w rocketfish- good enough?

how cool will it be with 1 80mm led fan on the side close to the bottom of the case my 3 92mm fans on the 9800 and its stock gpu cooler on the card and stock fan on the Q8200 and the room in the case helps.
As far as the PSU is concerned, it's not just about the wattage. It's about how it's distributed. For example, if I remember correctly (somebody please correct me), the 9800 GTX takes 24A on the 12v rail. And again if I remember correctly, if the power supply has three 12v rails, 18A each, and your graphics card needs 24A, then it will not be enough unless there's some sort of way it can take from one of the other 12V rails to supply all 24A. I'm willing to bet that this Rocketfish PSU doesn't do that. Although it might. I don't have any way of knowing. But when it's that cheap for a 700W PSU, I'd say that it probably isn't a good PSU, especially for gamers or anyone who wants to have a power-hungry graphics card.

As for your choice of power supply, I say you can do much better than that. I mean, Rocketfish? Hmm. The last time I checked, Rocketfish was Best Buy's brand. In other words, it's probably not true quality like Corsair, Silverstone, PC Power and Cooling, or even OCZ. I mean no personal offense here. I only want to help you avoid a negative experience.

My power supply, the Corsair HX520W is a 520W PSU, has three 12V, 18A rails, and it can handle my 9800 GTX+ without any problems, even overclocked to 835/1200/1300 or so. This is because, according to Corsair's website regarding the HX series, "Triple 12V Rails provide independent reliable power to the CPU, video card and other components with a combined rating of 50A (40A on 520W) maximum! Advanced circuitry design that automatically enables power sharing between the triple +12V rails in an event of overload on any single +12V rail." This isn't to say that the Corsair HX series is the only PSU that does this. It's just the only one I'm aware of that definitely does because it's the only PSU I've ever owned and thus the only one I've cared about. I admit, my experience is very limited. But I'm extremely happy I bought this PSU. It is rock solid! And according to Newegg, Corsair was voted "Best Power Supply Manufacturer 2008 by Custom PC’s readers".

However, if I wanted to do the 9800 GTX+ in SLI, I would definitely need more watts. So, then I would just get the HX620W and call it a day.

Speaking of the HX620W, here's an excerpt from its description on Newegg: "An important tip from one of our users: don't just check total power output, find out what you need in the way of current on each power rail. If you need 20 A on your +12V rails and the supply only has 15A, it doesn't matter how many watts the supply puts out: don't buy it. Make certain that you have ENOUGH rails, too: sometimes, you need more than just two +12V rails for your setup."

Anyway, the HX520W is $109.99 at Newegg with Free Shipping, and it's $94.99 after a $15 mail-in rebate (or "MIR"). So, if you never go SLI with your 9800 GTX, then this PSU will be much better than that Rocketfish one. I can almost guarantee it. Plus, it's a modular PSU. That's always a plus. But if you need to go SLI, then get something like the HX620W, or some other quality 600+ watt PSU. For triple SLI, go above 750W. But again, it's not just about the wattage. It's more important to pay attention to the distribution of that power.


I'm sorry this was so long, but this can be quite important. I mean, the PSU is the heart of your system, and it's going to supply the electricity it needs, so you don't want a weak heart!
Edited by TwoCables - 12/24/08 at 11:52am
It's a computer!
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It's a computer!
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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 
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post #4 of 26
Thread Starter 
thanks for the all the information and yes i meant cool as in temp lol. I will probably buy a good psu next.
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post #5 of 26
Good PSU is the first thing I'd buy. Guess I'm paranoid.
post #6 of 26
Thread Starter 
can anyone recommend me a good psu to support all that for like $100 max? Oh and i think my monitor should be included also, it is a AOC international 22'' so it needs fair bit of power also.
this one has 3 18a rails it is here http://www.tigerdirect.com/applicati...92557&csid=_21 is that a good one?
Edited by jeremygj - 12/23/08 at 5:36am
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post #7 of 26
Help everyone. I was just looking at the OCZ PSU he found, and so I went to its product page at www.ocztechnology.com to find out more about this PSU.

Now, I'm no expert. I think it's likely that what I'm about to say is wrong. But, after reading the StealthXstream 600W Mechanical Drawings and the Manual, it looks to me like the absolute maximum this PSU will take on the PCI-E rail is 20.5A, then it'll shut down for safety to protect the PSU from damage. As far as I can tell, the Mechanical Drawings tell me that just the +12V4 is for PCI-E, and the manual looks like it says that it'll handle up to an absolute maximum of 20.5A. If the 9800 GTX requires 24A, then according to what it looks like to me, this PSU will not be able to handle it.

But, is this true? Or can you guys teach me something?
Edited by TwoCables - 12/24/08 at 11:53am
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... 
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Reply
post #8 of 26
Quote:
Originally Posted by TwoCables View Post
As far as the PSU is concerned, it's not just about the wattage. It's about how it's distributed. For example, if I remember correctly (somebody please correct me), the 9800 GTX takes 24A on the 12v rail. And again if I remember correctly, if the power supply has three 12v rails, 18A each, and your graphics card needs 24A, then it will not be enough unless there's some sort of way it can take from one of the other 12V rails to supply all 24A. I'm willing to bet that this Rocketfish PSU doesn't do that. Although it might. I don't have any way of knowing. But when it's that cheap for a 700W PSU, I'd say that it probably isn't a good PSU, especially for gamers or anyone who wants to have a power-hungry graphics card.

As for your choice of power supply, I say you can do much better than that. I mean, Rocketfish? Hmm. The last time I checked, Rocketfish was Best Buy's brand. In other words, it's probably not true quality like Corsair, Silverstone, PC Power and Cooling, or even OCZ. I mean no personal offense here. I only want to help you avoid a negative experience.

My power supply, the Corsair HX520W is a 520W PSU, has three 12V, 18A rails, and it can handle my 9800 GTX+ without any problems, even overclocked to 835/1200/1300 or so. This is because, according to Corsair's website regarding the HX series, "Triple 12V Rails provide independent reliable power to the CPU, video card and other components with a combined rating of 50A (40A on 520W) maximum! Advanced circuitry design that automatically enables power sharing between the triple +12V rails in an event of overload on any single +12V rail." This isn't to say that the Corsair HX series is the only PSU that does this. It's just the only one I'm aware of that definitely does because it's the only PSU I've ever owned and thus the only one I've cared about. I admit, my experience is very limited. But I'm extremely happy I bought this PSU. It is rock solid! And according to Newegg, Corsair was voted "Best Power Supply Manufacturer 2008 by Custom PC’s readers".

However, if I wanted to do the 9800 GTX+ in SLI, I would definitely need more watts. So, then I would just get the HX620W and call it a day.

Speaking of the HX620W, here's an excerpt from its description on Newegg: "An important tip from one of our users: don't just check total power output, find out what you need in the way of current on each power rail. If you need 20 A on your +12V rails and the supply only has 15A, it doesn't matter how many watts the supply puts out: don't buy it. Make certain that you have ENOUGH rails, too: sometimes, you need more than just two +12V rails for your setup."

Anyway, the HX520W is $109.99 at Newegg with Free Shipping, and it's $94.99 after a $15 mail-in rebate (or "MIR"). So, if you never go SLI with your 9800 GTX, then this PSU will be much better than that Rocketfish one. I can almost guarantee it. Plus, it's a modular PSU. That's always a plus. But if you need to go SLI, then get something like the HX620W, or some other quality 600+ watt PSU. For triple SLI, go above 750W. But again, it's not just about the wattage. It's more important to pay attention to the distribution of that power.


I'm sorry this was so long, but this can be quite important. I mean, the PSU is the heart of your system, and it's going to supply the electricity it needs, so you don't want a weak heart!

The 9800GTX TDP is around 160w or 12v@14A. This power draw is through the PCIe slot and the two 6-pin PCIe power plugs.

Avoid Rocketfish. Their 500w unit is actually a dangerously bad 300w and their 700w unit is actually a 500w PSU. In addition, they are grossly overpriced. There are better budget PSUs than those.

HX620W is actually a single-rail PSU. Seasonic originally designed it as multiple rail via over current protection. However, if you open one of the units up, you can see that the OCP circuit has been purposely soldered together.

Power distribution rarely matters unless you are using multiple Y-adapters or running a TEC.
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Once again...
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post #9 of 26
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so whats recommended?
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post #10 of 26
Quote:
Originally Posted by jeremygj View Post
so whats recommended?
What is your pricing point?
Once again...
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CPUMotherboardGraphicsRAM
i7 920 [4.28GHz, HT] Asus P6T + Broadcom NetXtreme II VisionTek HD5850 [900/1200] + Galaxy GT240 2x4GB G.Skill Ripjaw X [1632 MHz] 
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Intel X25-M 160GB + 3xRAID0 500GB 7200.12 Window 7 Pro 64 Acer H243H + Samsung 226BW XARMOR-U9BL  
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Once again...
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Hard DriveOSMonitorKeyboard
Intel X25-M 160GB + 3xRAID0 500GB 7200.12 Window 7 Pro 64 Acer H243H + Samsung 226BW XARMOR-U9BL  
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Antec Truepower New 750W Li Lian PC-V2100 [10x120mm fans] Logitech G9 X-Trac Pro 
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