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  Question about operating in VGA mode 
 
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3-Oh-Beast Nov 08, 2007, 04:39pm EST Reply - Quote - Report Abuse
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Edited: Nov 08, 2007, 04:47pm EST

Replies: 5 - Views: 834
Trying to solve a related issue.

When a PCI-E video card is functioning in standard vga mode without drivers...how is it drawing power? Is it the same as when it is "activated" by drivers?

The reason im asking is because i have an 8800gtx (and an 8800gt) and after installing nvidia forceware drivers of any kind, i get blue screen (in vista32 AND xp)

When im without any drivers and just in vga mode, everything is working fine.

So now im wondering if this is a power constraint issue. Im using an ultra x pro 750w sli approved PSU but i also have two 10,000rpm raptors and a dvd drive.

Any insight from the serious tech heads is appreciated.


:: P5N32-E sli + Q6600 @ 3ghz
:: 4GBs Corsair XMS2 DDR2 800
:: EVGA 8800GTX
:: 2 WD Raptors 10,000rpm 74gb RAID0
:: Gateway 24" FHD2400 LCD
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IndieMan105 Nov 17, 2007, 02:33pm EST Reply - Quote - Report Abuse
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>> Re: Question about operating in VGA mode
always possible.. is the card oc'd at all or stock and holy $hit what do you need 2 10.000 rpm raptors for those are suckin juice im sure

Indieman

E6650 oc'd to 3.4g
4X 2gb ram 1333
1200w raidmax
2X NVidia 8800 gtx 768's (SLI) heck yes!!!
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Chris McGee Nov 17, 2007, 02:48pm EST Reply - Quote - Report Abuse
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>> Re: Question about operating in VGA mode
Does it do this with your processor at stock speeds aswell?

FordGT90Concept Nov 17, 2007, 08:11pm EST Reply - Quote - Report Abuse
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Edited: Nov 17, 2007, 08:13pm EST

 
>> Re: Question about operating in VGA mode
I highly doubt vga.dll versus AMD/NVIDIA driver have much effect on power draw--at least not to a great enough extent to cause a BSOD. My guess is the drivers are not a match for the card or the drivers are simply bad. If the card came with a computer, get the drivers from the computer manufacturer. Otherwise, try different drivers from AMD/NVIDIA/etc.

Hard drives only draw a lot of power when they are spinning up. After that, their power consumption is relatively low (not much more than 10w each).
http://techreport.com/articles.x/10152

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john albrich Nov 17, 2007, 09:57pm EST Reply - Quote - Report Abuse
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Edited: Nov 17, 2007, 10:00pm EST

 
>> Re: Question about operating in VGA mode
The Raptors aren't the problem.

It's unlikely the Raptors pose any additional strain on the system. Here are the electrical specs of a high speed, high capacity WD1500AHFD (160GB-Raptor/10,000rpm/3ms avg latency/4.6ms read seek)

WD Raptor power values are in fact often lower than some "standard" hard drives people use, and about the same as what I would consider the "average" hard drive these days. The 4 drives in my basic system each draw more power than this Raptor on both the 12V and 5V rails.

WD1500AHFD Raptor 160GB
Electrical Specifications
Current Requirements
12 VDC
Read/Write 470 mA
5 VDC
Read/Write 875 mA
Power Dissipation
Read/Write 10.02 Watts
(Total Power in his system=10W x2 =20 Watts)

An older HP CD-RW drive (model LTR-52327SHP) I used to have in my basic system was spec'd at:
1.5A@12VDC
1.5A@ 5VDC
That's a total of 26 Watts

My non-Raptor IDE 160GB drives are EACH spec'd at about:
Power~15Watts
Total Power = 15W x 4 = 60Watts



edit-clarify which watts were which. What?

john albrich Nov 17, 2007, 10:14pm EST Reply - Quote - Report Abuse
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>> Re: Question about operating in VGA mode
I'm speculating that without drivers, the video card memory usage is minimal. With the drivers, I would bet memory usage goes way up and there are a lot more transitions, producing more heat (actual state transitions are usually when the most power is dissipated)

I would also imagine that with the special drivers the card is able to offload significantly more processing that otherwise would be handled by the system CPU. Again, more power would be dissipated by the video card.

I've read that a video card memory monitor is available, but I don't know where it might be found. If you can find one, you can compare memory usage between "with high-performance card drivers" and "without high-performance card drivers".


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