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Graphics card help

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August 6, 2011 7:06:13 PM

So recently i have been thinking about upgrading my HD 5570 to a more higher end GPU. I've been looking at the HD 6870 and found out that a 500w PSU is recommended. I have a 450w PSU with 2 12v rails with 18a for each rail. I have been searching around the web and found this website that gives the power requirements for many graphics cards. I found out the HD 6870 only requires 28a. Would my 450w PSU be enough for the 6870?

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August 6, 2011 7:45:23 PM

Maybe, it'd probably work when not under maximum load, but it might have problems when working hard.

Or it might not.

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August 6, 2011 7:53:51 PM

It will work if you have good quality psu. Who made yours?
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August 6, 2011 8:13:40 PM

FSP Group made my psu
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a b U Graphics card
August 6, 2011 8:16:31 PM

The 6870 itself does not require 28A. That's the recommended 12V output of a PSU for an entire system containing a 6870 within it. I mean really, 28A? That's 336W of power! A GTX580 doesn't use that much.

A 500W PSU recommendation from a manufacturer is an over-estimate. Why? Well because not all PSUs are the same. Some still use 10-year old designs that have as much or more power dedicated to the 3.3V and 5V rails as the 12V rail(s). More modern PSUs have far more power dedicated to the 12V rail(s), as the majority of a system's components require 12V power. Manufacturers have to cover all the bases with their recommendations because there are some truly garbage PSUs still being produced and sold today. As such, their minimum recommendations are always on the high side.

Your current PSU may be able to handle a 6870, but that's going to depend on the rest of the components in the system and the quality of the unit itself. Please provide it's make and model and a more complete system configuration.

Edit: Looks like I was replying as you added the above. Still, the rest of the config and it's model number (or specs) would help.
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a b U Graphics card
August 6, 2011 8:32:20 PM

Yes a quality 450 W PSU should handle a single 6870. This would represent a 67% load for a 450 Watt PSU. REMEMBER some of the lower end PSU only provide 50 to 70% of their rated Load (The diff between test enviorment and REAL life usage.
Myselft I'd probably go with a quality 500 Watt PSU (60% load).

Quote ( for a OCed I7-965@ 3.75 GHz)
Keep that in mind. Our normal system power consumption is higher than your average system.
System in IDLE = 173W
System Wattage with GPU in FULL Stress = 295W
End quote
From a 2nd review, Intel Core i7 920(ES) @ 4.0Ghz (Turbo Mode Enabled)
Quote Total system power, Idle 171 Watts, Full load 287 watts)
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August 6, 2011 9:19:32 PM

RazberyBandit said:
The 6870 itself does not require 28A. That's the recommended 12V output of a PSU for an entire system containing a 6870 within it. I mean really, 28A? That's 336W of power! A GTX580 doesn't use that much.

A 500W PSU recommendation from a manufacturer is an over-estimate. Why? Well because not all PSUs are the same. Some still use 10-year old designs that have as much or more power dedicated to the 3.3V and 5V rails as the 12V rail(s). More modern PSUs have far more power dedicated to the 12V rail(s), as the majority of a system's components require 12V power. Manufacturers have to cover all the bases with their recommendations because there are some truly garbage PSUs still being produced and sold today. As such, their minimum recommendations are always on the high side.

Your current PSU may be able to handle a 6870, but that's going to depend on the rest of the components in the system and the quality of the unit itself. Please provide it's make and model and a more complete system configuration.

Edit: Looks like I was replying as you added the above. Still, the rest of the config and it's model number (or specs) would help.

Thanks for the reply, i have gained a little bit of relief about the 6870.

PC Specs:
Intel Core i5-650(3.2GHz)
8GB DDR3 Ram(1333 Mhz)
ATI Radeon HD 5570
1TB HDD
FSP450-60EP PSU
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August 7, 2011 2:58:42 AM

Best answer selected by mrstarrz.
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