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EVGA GTX 460 768Mb "true" power requirements

post #1 of 4
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Good afternoon all,

I'm new to the site and just recently built my first gaming PC with these specs

Antec Sonata III Case
Antec Earthwatts 500W PSU
8GB (2gb x 4) G.skill Ripjaws DDR3 RAM
Intel Core i7 - 870 (1156 socket)
ASUS P7P55D-E Pro
Seagate Barracuda 1.5TB 7200
OCZ Vertex 2 90GB
EVGA GeForce GTS 450
2x Lite-on dvd-rw Lightscribe drives
SIIG 3.5" card reader

The GTS 450 has been serving me fairly well so far, but occasionally has some low framerate issues when playing games at their highest settings. I'm considering an upgrade to a 768 mb GTX 460, but I had some questions about the power requirements.

The EVGA product spec states that the 460 requires 12v@24A for power.

My PSU only provides 22A, but I've heard anecdotally that people have been running the card on the OCZ Stealthxstream line which only provides 18A. Can anyone confirm a "true" minimum power requirement?

I've also been trying out different PSU calculators to determine if I'll need a PSU upgrade anyway to support the wattage requirement, but the different PSU calculators I've tried have been giving me wildly different power requirements from around 380W (from Antec) to 575 (Newegg). Can anyone tell me if they think that my 500W PSU can deliver the wattage nescessary for the system if I upgrade the video card?

Thanks much!

Justin
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Darkstar
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post #2 of 4
24A on the +12V is 288W. NVIDIA's website recommends a 450W power supply to run a system with a single GTX 460 in it, and this is even considering PSUs with a "Peak" rating of 450W. But the Earthwatts has a "Continuous" rating of 500W, so it's actually more than enough power.

Edit: I see that you have the EA500D model because the non "D" has 17A on both rails. However, both models have a +12V capacity of 408W (34A) which would leave 120W for the rest of the system (that is powered by the +12V) under the highest possible GPU load.

So, I still say it's enough power.
Edited by TwoCables - 1/10/11 at 8:29am
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It's a computer!
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post #3 of 4
I think you shouldn't bother with the GTX 460 768mb. For a small amount extra, you can get the GTX 460 1GB which completely dominates the 768mb version at all tasks.
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First build
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post #4 of 4
Quote:
Originally Posted by Will29j View Post
I think you shouldn't bother with the GTX 460 768mb. For a small amount extra, you can get the GTX 460 1GB which completely dominates the 768mb version at all tasks.
The 1GB is marginally better than the 768mb.

Source: http://www.anandtech.com/bench/Product/180?vs=156

I wouldn't call 1-3 fps "dominating"
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