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Old July 17, 2009, 10:06 AM
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Question Concerned about PSU and CPU cooler

I have recently ordered up some parts for a budget gaming build. For a mother board I went with the Crossfire III, CPU is a AMD Phenom II X2 550 Black Edition, gpu dual MSI R4830-T2D512 Radeon HD 4830 512MBs, for the system ram I went with OCZ Gold AMD Edition 4GB (2 x 2GB), the cpu cooler I picked up is the OCZ Vendetta 2, the case is a NZXT Beta and the PSU I have is Antec TP3- 550 PSU.

To address the extra heat from the teo 4830s and rolling the dice on unlocking the 3rd and 4th cores on the 550 I picked up 3 more 120mm fans to keep things cool.

My questions are I am getting different results on power supply calculators for the min wattage I need for this build. Antec's site Antec Power Supply Calculator says I will only need 338 w but when I use Asus's calc ASUSTeK Computer Inc.-Support- they recommend 700 w. Can anyone clarify my power needs and if the 550 w will be sufficient?

My other worry is seeing the size of the OCZ Vendetta 2 will it fit inside the NZXT Beta Case?
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Old July 17, 2009, 10:32 AM
CroSsFiRe2009's Avatar
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550W is more than enough for your needs, even a 450W is possible but that's pushing it since a bit of headroom is always nice. Most people tend to overestimate on the power supply requirements or prefer it at ~50% load so the fan doesn't ramp up as fast.
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Old July 20, 2009, 12:23 PM
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Thanks for the info, now I am waiting for everything to show up and see if the CPU cooler will fit in the case with the extra 2 fans on the cover.
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Old July 20, 2009, 02:12 PM
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having a power supply at 50% load is ideal for efficiency because most power supplies have best performance at 50%. But your 550W should be more than enough. Take some measurements, the OCZ vendetta 2 has its dimensions provided, measure from the mobo to the side pannel area.
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Old July 20, 2009, 03:41 PM
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your built will go at maximum 400 watt so you have 150 watt over needed. The only reason why PSU calculator are so high is 1 to sell more and 2 to be sure people dont buy a cheap 350 if needed 350 and all blow up.

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