Solution for GeForce 6800's Power Greed

draxsath

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I've probobly going to get a 6800 Ultra ( i planned on getting the 'geforce 6' when it came out anyhow.) but the power supply stuff really disturbed me. I'm running an Antec 550W, and i cant spare a single watt, or i'll overload it. (i have ALOT of stuff in my computer)

so it got me thinking about adding a second power supply to my computer, this raises 2 problems:
1 - Finding a power supply that is not only small enoguh to fit into my case, but powerful enough for the card.
2 - How to run an ATX power supply without it being conncted to a motherboard.

so after a few minutes of reasearch and putting google to work, i came up with the following solution:

First, you need a Shuttle 200W PSU. VERY SMALL. will fit onto the back of my case easily. It's only 8.2cm X 4.2cm X 19cm.

<A HREF="http://www.newegg.com/app/viewProductdesc.asp?description=17-157-005&depa=0" target="_new">The 200W Shuttle PSU on NewEgg.com</A>
<A HREF="http://www.pricewatch.com/2/297/980-1.htm" target="_new">Other small Shuttle PSU's on pricewatch.com (Much cheaper)</A>

Next problem, getting it to run without a motherboard, like an old AT power supply. I did some searching and found a guide that tells how it can be done, the mod is very simple!

<A HREF="http://modtown.co.uk/mt/article2.php?id=psumod" target="_new">How to Mod a PSU to run without a motherboard, from modtown.co.uk</A>

and there you have it, all you need to do is mod your case to fit the spare supply in there somwhere, shouldent be a problem as long as your case has some spare room. The 200W's is plenty to cover the 110W required by the card, and its got plenty of molex connectors. With even the most high end power supplies, you won't have enough to power this card as well as all the other junk in your system.

i have 3 hard drives, 3 optical devices and like 8 fans among other things, i've also blown out a 350W, and 450W powersupply by pulling too much power from it, so i know i can't power this card without some modifications.

I cannot be held responsible for any damage that incurs because of this mod, i only put A and B together, as the card isnt even out yet, and i dont have this power supply, this is all THEORETICAL. It might not work, your house might burn down. But i cannot be held liable for your tinkering.

Though this will probobly work, no promises.

<P ID="edit"><FONT SIZE=-1><EM>Edited by draxsath on 04/19/04 12:48 PM.</EM></FONT></P>
 

TheRod

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For your info, some reviews of the 6800 repart that it don't need that much power to run. The new 6800 only consumes 10 Watts more power than a 5950. The site Hardware.fr only recommend 400Watts + power supply for people who have a lot of stuff in their PC.

By the way, have you measured your actual power consumption, you should get a multimeter and measure the current your PC use, you might be surprised to see that you don't use that much.

Watts = Volts * Amps.

Usually PSU effectiveness is under 70%, so if you multiply Watts * 0.7 you will know how much your PSU is loaded. Of course, this method don't show you how much 3.3, 5 and 12 Volts you use. But this will give you a good reference.

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draxsath

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well i just saw a problem and it dawned on me how to fix it, thought i'd share, whether its worth it or not is up to you.

anyway. as far as my expiriences with PSU's, i've blown out 3 already (forgot to mention the old 300W. They all died the same way, from trying to pull too much power. so i've lost a 300W, 350W, and 450W. I've got an Antec True 550W which is reviewed everwhere as actually having 550W of power. Since i went through 3 PSU's already i got the best-reviewed, most relaible, highest wattage, best-warrantied one i could possible find and money was no object this time. and ever since it's been running great. i think my system uses close to 450W of power, but it can peak over that alot, like when hard drives spin up and so forth.

I wouldent want to blow another power supply for adding a new video card, so this option for me is more of a "better safe than sorry" approach, and its only about $50 for the extra PSU on pricewatch, and if you've got the mega bucks to buy the 6800, then you've probobly got another $50 to spend anyway. If you've ever heard the capacitors on a PSU explode, its a scary and very traumatizing sound for any enthusiest. And its certainly somthing i would not want to hear for the 4th time this year...

funny thing is i have a multimeter, but i dont know how to use it really.... some guy left it at my house.

what would i do to use it and find out how much power i'm using?

<P ID="edit"><FONT SIZE=-1><EM>Edited by draxsath on 04/19/04 03:16 PM.</EM></FONT></P>
 

TheRod

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anyway. as far as my expiriences with PSU's, i've blown out 3 already (forgot to mention the old 300W. They all died the same way, from trying to pull too much power. so i've lost a 300W, 350W, and 450W.
Wow! I never blew a PSU, but I have 2 wonderful friends : a small UPS and an electrical surge protection power bar.

In some area, electricity can fluctuate and cause damage to PSU, even if you use protective power bar. If you really are into overclocking + load of stuff in your PC, you should invest into a UPS, it's cheap and save you from crash due to electricity problem.

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cleeve

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If you've ever heard the capacitors on a PSU explode, its a scary and very traumatizing sound for any enthusiest.

Ack! The dreaded ***SNAP*** sound!

I know it all too well...

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draxsath

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In some area, electricity can fluctuate and cause damage to PSU
actually all the electrical stuff in my house was recently redone completely, though the neighborhood might be sub-standard. and yes it might have been due to that, but actually the first 2 PSU blew at a completely different house, and the 3rd one blew out here. i'm 99% posotive i just needed more power.

as for UPS's they tend to be rather expensive... do they regulate power as well as provide backup? i mean i got a surge protector and stuff, a good one...
 

TheRod

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as for UPS's they tend to be rather expensive...
APC BackUPS 500 are less than 80$ on PriceWatch, this is not expensive.

do they regulate power as well as provide backup? i mean i got a surge protector and stuff, a good one...
Yes, the regulate power too. I connect mine to the wall and I plud my surge protection power bar into my UPS. I protect my PC and, my cable modem and my HUB with an old APC Back-UPS 500. My UPS is not big enough to protect my 17 inchs monitor, but I don't really care. What is important to me is my data (HDDs).

actually all the electrical stuff in my house was recently redone completely
Most electricity problem/hit came from the power line outside your house. I moved to my new house 3 years ago, and my UPS rarely "beep" for surge or power outage. My last house was not in the same city (it was a bigger city) and my UPS kept beeping at least once a week.

It's what I like about my UPS, I really know when something goes wrong with the electricity, my UPS is connected to my PC through RS-232 (DB-9) cable on COM1, and I can monitor electricity hit when I check my Windows XP log files.

With these log, I can clearly see that my power is a lot more stable than it was before. Which is great!

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draxsath

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i might just get one then. what i'm wondering is do i need one thats the same or more wattage than my PSU? ( i dont know anything about power backups really)

because i'm gonna need a hefty UPS for this thing, especially if i eventually add another 200W PSU to it

EDIT: checked some out, looks like i might have to spend over $100 for an 800+ Watt UPS

<P ID="edit"><FONT SIZE=-1><EM>Edited by draxsath on 04/19/04 07:14 PM.</EM></FONT></P>
 

coolsquirtle

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I can't wait to see on Dell's site
GeForce 6800Ultra +399.99
(additional power supply is require to run this card because we're cheap and only want to put 300W PS in our computers)
Additional power supply+ 59.99

RIP Block Heater....HELLO P4~~~~~
120% nVidia Fanboy+119% Money Fanboy
GeForce 6800 Ultra--> The Way we thought FX 5800Ultra is meant to be played
THGC's resident Asian and nVboy :D
 

TheRod

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<A HREF="http://www.apc.com/template/size/apc/index.cfm" target="_new">UPS selector</A>

Here is what I have connected to my Back-UPS 500 (500VA/300Watts), this UPS cost me about 200$CA 5 year's ago.
- 2 HDD
- 2 optical drive (CD burner and DVDROM)
- 3D card (overclocked Radeon 8500LE)
- Athlon XP 1800+ (overclocked at 2.0GHz/1.8Volt)
- 1 network card
- All onboard stuff (lan, audio, etc...)
- Optical mouse, keyboard
- Cable-modem
- 8 port HUB

My UPS is powerful enough for this rig, I don't know how much more stuff you have in your PC, but you don't need to connect your monitor if you only want to protect your DATA. The monitor is a power hungry component that gives hard time to little UPS. And don't forget that most power outage last only a few seconds to a few minutes, so you don't need your UPS to last an hour long.

<A HREF="http://www.apc.com/resource/include/techspec_index.cfm?base_sku=BE725BB&fnl=4605,2&fnl_basket=4605,3c" target="_new">This model</A> seems to be a good choice for PC tower protection.

If you buy a UPS, don't forget to configure Windows XP to automatically shutdown your PC after a few minutes of power outtage. UPS have RS-232 or USB port to "talk" to the PC.

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