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Windows 7: Radeon HD 6850

07 Aug 2011   #11
bobkn

Windows 7 Pro X64 SP1
 
 

Quote   Quote: Originally Posted by metamaycry View Post
wow u u sure bob that its 500 watts ive seen many of my mates run that card with a 350 watt supply
I'm just quoting Sapphire.

500W seems excessive, as the card can't draw more than 150W if it stays within the PCI-E specs (75W through the slot, 75 more for the 6 pin PCI-E connector). However, it may cover poor 500W PSUs; you may be able to get away with less if the supply is any good (adequate current on the +12V rail). 300W seems a little dicey, though.


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07 Aug 2011   #12
Maguscreed

Microsoft Community Contributor Award Recipient

Windows 7 x64
 
 

The load power draw of a 6850 is a lot closer to 230...
Radeon HD 6850 Power Consumption and Thermals | bit-tech.net
My System SpecsSystem Spec
15 Aug 2011   #13
banquo

Windows 7 Ultimate Home x64
 
 

For what it's worth, I recently installed this card (XFX branded) in my Dell XPS 8300, which has a 460w power supply. It took one 6-pin molex connection. No problems so far, including running Crysis 2. But I haven't stress tested it.
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15 Aug 2011   #14
Maguscreed

Microsoft Community Contributor Award Recipient

Windows 7 x64
 
 

Quote   Quote: Originally Posted by banquo View Post
For what it's worth, I recently installed this card (XFX branded) in my Dell XPS 8300, which has a 460w power supply. It took one 6-pin molex connection. No problems so far, including running Crysis 2. But I haven't stress tested it.
If the psu has decent amps you should be fine with that.
Of course cpu, number of drives, number of fans, number of usb devices.
It all adds up, that' been the general point I've been trying to make here.
My System SpecsSystem Spec
15 Aug 2011   #15
bobkn

Windows 7 Pro X64 SP1
 
 

Quote   Quote: Originally Posted by Maguscreed View Post
The load power draw of a 6850 is a lot closer to 230...
Radeon HD 6850 Power Consumption and Thermals | bit-tech.net
Only a week late with this, but...

That's a system total ("watts at socket"), not the graphics card alone.
My System SpecsSystem Spec
15 Aug 2011   #16
Maguscreed

Microsoft Community Contributor Award Recipient

Windows 7 x64
 
 

lol well more power to you think you can run a modern system with a gaming level graphics card on 230 watts.
My personal experience dictates that is completely impossible.
In fact even without the graphics card my system in the main room won't even post with a 350 in it.
...and it's a old socket 939 amd.
My System SpecsSystem Spec
15 Aug 2011   #17
bobkn

Windows 7 Pro X64 SP1
 
 

Quote   Quote: Originally Posted by Maguscreed View Post
lol well more power to you think you can run a modern system with a gaming level graphics card on 230 watts.
My personal experience dictates that is completely impossible.
In fact even without the graphics card my system in the main room won't even post with a 350 in it.
...and it's a old socket 939 amd.
Sounds like a lousy 350W supply. (I think I used a Tagan 480W on my old S. 939 system, though. It's still in use by a friend.) I don't know what the required PSU rating would be for a system with a maximum power consumption of 230W. I've not done any experiments to match minimal PSUs to PCs.

Graphics card power consumption:

Imageshack - gfxpowerchartbybrandgen.png

This puts a 6850 at 125W max. (Nominal maximum for a card with a single 6 pin PCI-E power connector: 150W.)

The I7-965 used in the BitTech review is rated at 130W. That's 255W combined. Assuming an 80% electrical efficiency, that would be about 320W wallplug. The 230W number is pretty low.
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