MorrisAnsrawi7

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This is my specs:

Intel i5 2400 (stock cooler)
Asus P8H67-M LE (no cfx/SLI)
Kingston Ram (4GB)
Msi 5870 Twin Frozer
ASUS Xonar DG 5.1 sound card
LG DVD Rewriter
WD Caviar Blue 500GB
WD Caviar Black 1TB
Seagate Barracuda 1TB
Kingston SSDNow V series 64 GB
Corsair 750HX or Corsair 650HX

Well the question is which power supply do i use? I have both of them. I bought the 650HX (just received today) and at the same time i got the 750HX for a present from my brother. Will the 750HX overkill/bottleneck my build? or is the 650HX just good enough to power my system? I remember watching one of the youtube video that psu can also bottleneck the system.

Thanks in advance.


 
:lol:

No. A PSU will either provide adequate power or it won't. If it cannot provide adequate power, the system will not work - the ultimate bottleneck.

The CPU and the video card in your system are the main power users. Together, they will use about 250 - 280 watts. I estimate that your system will not use more than about 400 - 450 watts at full load.

The 650HX will be OK. I would use the 750 watt PSU. But then I tend to overspec PSU's.
 

MorrisAnsrawi7

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Alright Jsc, i'll take your advice. I will start building the pc with the 650HX and i could use that 750HX for the bulldozer or LGA2011 or future wise. Anyway thnks for the reply. :)
 
The 750W would be more appropriate if you were ever to use two 5870s. Or if you just generally upgrade quite often.

400-450W seems like an overestimation to me, based on the following:
http://www.guru3d.com/article/radeon-hd-5870-review-test/13
http://www.techspot.com/review/198-ati-radeon-hd-5870-review/page13.html
http://www.tomshardware.com/reviews/radeon-hd-5870,2422-20.html
All of which show ~350W under Furmark, at the wall. The actual system power consumption will be 10-20% less because of the efficiency of the power supply. And the power consumption for MorrisAnsrawi's build will be lower again due to using a Sandy Bridge CPU compared to the i7-965s and i7-975 that were used in those benchmarks. So the 650HX will be more than 'ok'.
 

MorrisAnsrawi7

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Silvune, i dont think i am going to cfx/sli, but i will probably upgrade soon. Hence, the board only contain a single PCI-E x16 slot. I'll probably use that 750HX for the next socket LGA2011 or bulldozer build.

I got the system running, so far it is stable with the 650HX.