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Radeon 5770 PSU Requirement (vs GTS450)

Last response: in Graphics & Displays
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January 17, 2011 11:50:25 AM

I am interested in buying a Sapphire Radeon HD5770 1GB DDR5 VAPOR-X OC Edition Lite. I have built a system on the basis that i was going to get a GTS450. My PSU is CoolerMaster 460W (actual output 400W) with 18A on each of the two 12 rails. Should i stick with the GTS450 or can i go with the 5770 (knowing that a PSU upgrade is out of question)??

It's interesting to note that Sapphire's website says that a PSU of 500W is required for the 5770 (Vapor-X and regular) whereas Nvidia's site says 400W required for the GTS450.
However, on several online PSU calculators i've used, i always get the opposite result: 5770 requires less power than GTS450 (both tried with the same set of hardware: i3 3 Ghz, regular mobo, 2 x 2GB DDR3, 2 Sata HDDs and 2 DVD-RW).

Which is true? Need your help.
Thanks.

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a c 363 U Graphics card
January 17, 2011 2:35:07 PM

You'll be fine the HD 5770 uses less power than the GTS 450.



Source: http://www.xbitlabs.com/articles/video/display/nvidia-g...

Sapphire and other companies are generally conservative as to the power requirements because they do not know what kind of PC you have. For example, you may have an i7-950 CPU while someone else has an i3-550. The i7-950 uses more power and would therefore need a more powerful PSU.
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a b U Graphics card
January 17, 2011 3:03:08 PM

You'll be fine with the 5770. They clock down when under a light load. Down side of the CM 460 is the fan gets a little bit noisy when under load, but not annoyingly bad.
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January 18, 2011 10:20:35 AM

Best answer selected by Makaveli84.
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a c 272 U Graphics card
January 18, 2011 5:42:44 PM

This topic has been closed by Mousemonkey
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