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PSU Help - Page 2

post #11 of 15
Quote:
Originally Posted by psyclum View Post

ahh hehe well, still the HX750 does already have a fairly healthy headroom for him to play with since a SLi really only need a 650w to be safe. IF he wants to spend the $ on a new PSU for the sake of buying something shinny then I see no problems with it biggrin.gif just make sure you get a KM3 or something like that this time so it will last twice as long biggrin.gif

Well, he wants to overclock his 780s. That's why he wants a larger capacity, and he will need it. A good 750W PSU would probably have JUST enough power, and that's not something you want.
It's a computer!
(18 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.400-1.424V in Manual Mode) 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 DriveOptical DriveOptical Drive
250 GB Samsung 840 EVO (C:) 250 GB Samsung 840 EVO (D:) Samsung SH-S243N 24x DVD Burner Samsung SH-S203N 20X DVD Burner 
CoolingOSMonitorKeyboard
Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG Filco Majestouch 104-key Cherry MX Blues w/NKRO 
PowerCaseMouseMouse Pad
Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate Basic, but premium round 
AudioAudio
X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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It's a computer!
(18 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.400-1.424V in Manual Mode) 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 DriveOptical DriveOptical Drive
250 GB Samsung 840 EVO (C:) 250 GB Samsung 840 EVO (D:) Samsung SH-S243N 24x DVD Burner Samsung SH-S203N 20X DVD Burner 
CoolingOSMonitorKeyboard
Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG Filco Majestouch 104-key Cherry MX Blues w/NKRO 
PowerCaseMouseMouse Pad
Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate Basic, but premium round 
AudioAudio
X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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post #12 of 15
hehe i think we are saying the same thing but different points of view. one of the primary reasons we recommend high quality PSU's is for its endurance. personally if i buy a PSU, i'd expect to still be using that same PSU 5 to 10 years from the date of purchase biggrin.gif in fact I'd be rather upset if a PSU died with just 5 years of use biggrin.gif this is the reason i buy the best PSU I can find.(or can afford at the time tongue.gif ) not only does it protect everything i plug into it, it also last forever smile.gif so, i tend to not recommend a new PSU if the existing PSU is still within it's service lifetime.

handling a pair of GTX780's is completely within the capability of a quality 750w unit. OC mileage may vary but the chances of him actually drawing maximum power on gaming load is practically nil. he did not mention any high stress long duration applications such as mining or folding so i'm assuming he's just talking about normal gaming loads. this is why i said, IF he wanted to buy something new, there is no problems as long as he knows his current PSU is still within its service lifetime and can most likely handle the load he's proposing for another few years.

now... if he start spouting about LN2 or something like that, then by all means lets put him into a 1KW unit so he can try for a world record biggrin.gif
post #13 of 15
^^^^ This.

If you're building a PC for benching purposes, you need to assume that CPU and GPUs are going to be maxed out simultaneously. In a gaming application, you're rarely going to have everything going at full power for any length of time.

GTX 780 stock TDP is 250 watts.
i7-3820 TDP is 130 watts.
RAM runs about 5-12W per DIMM
HDD run about 10W
SSDs run about 8W while writing, nil when reading

I say you're going to be 700W at 100% power, overclocked, with typical gaming power loads probably in the 550W range.

Greg

p.s. I know you probably figured this out already but you can't upgrade from a 3770K to a 3820 w/o buying a new MB. LOL.
post #14 of 15
No. Again, he said that he wants to overclock the 780s. At stock with an overclocked i7-3820, his power consumption while gaming will be 600-625W. So, do you really want his gaming power draw to be riding at around 750W or possibly more due to overclocking his 780s? I know I don't. The power consumption of the 780s goes up considerably when they're overclocked.

I mean, correct me if I'm wrong but doesn't the i7-3820 require more power when overclocked than an overclocked i5-3570K?
Edited by TwoCables - 8/8/13 at 7:35am
It's a computer!
(18 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.400-1.424V in Manual Mode) 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 DriveOptical DriveOptical Drive
250 GB Samsung 840 EVO (C:) 250 GB Samsung 840 EVO (D:) Samsung SH-S243N 24x DVD Burner Samsung SH-S203N 20X DVD Burner 
CoolingOSMonitorKeyboard
Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG Filco Majestouch 104-key Cherry MX Blues w/NKRO 
PowerCaseMouseMouse Pad
Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate Basic, but premium round 
AudioAudio
X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
  hide details  
Reply
It's a computer!
(18 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.400-1.424V in Manual Mode) 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 DriveOptical DriveOptical Drive
250 GB Samsung 840 EVO (C:) 250 GB Samsung 840 EVO (D:) Samsung SH-S243N 24x DVD Burner Samsung SH-S203N 20X DVD Burner 
CoolingOSMonitorKeyboard
Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG Filco Majestouch 104-key Cherry MX Blues w/NKRO 
PowerCaseMouseMouse Pad
Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate Basic, but premium round 
AudioAudio
X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
  hide details  
Reply
post #15 of 15
ok well, i suppose we can just say we have a difference in opinion. smile.gif

my take on it is that gaming load won't touch max load from a PSU point of view. even IF he exceeds max rated power with OC, he won't be there for long under gaming loads. you are correct in saying that the overall consumption will come close to rated power of the PSU but the duration of that consumption level is within the operating specs of the PSU. we don't recommend any PSU that can't put out its rated power on a continuous basis for less then 24hr's straight and unless he's talking about folding/mining i think we are on the safe side.

I feel it's safe for typical gaming use to stay with his PSU, however if he wants to buy a new one, that's entirely up to him.
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