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Old 07-26-04, 01:05 AM   #73
kahloq
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Default Re: Power Supply / 6800 Series Sticky

Quote:
Originally Posted by r2d2d3d4d5
My 6800NU arrived yesterday.

Unfortunately I've had artefacts on the BIOS boot up screens as well as Windows.



Here are the specs of my current PSUs:

Q-Tec
"550W PSU"
+3.3V@20A (Max, (Peak=30A)
+5V@35A (Max, (Peak=40A)
+12V@14A (Max, (Peak=20A)

AOpen
300W PSU
+3.3V@28A
+5V@30A
+12V@15A
(+3.3V&+5V=180W Max)
(+3.3V&+5V&+12v=280W Max)
Both of these power supplies are insufficient. The +12 on the Q-tec is only 14a(even tho peak is 20a peak is NOT a sustained lvl, but peak..ie maximum at one time)
The Aopen also is too low as the +12 is only at 15a. You need a PSU that carries at least 18a on the +12(and not just a peak rating but sustained).
Wattage of a PSU isnt the tell tale sign that its a good performer. AS you said the q-tec is a 550 watt PSU but it cant carry the load. I have a 420 watt PSU, but its +12 rail is 18a sustained.
__________________
SPECS:
Alienware
3.4 p4 /200FSB NO overclock
OCZ pc3500 performance 2 gig memory
OCZ 520 watt PSU
Asus p4c800deluxe-e motherboard
2 x 80g Sata HD's / 1 x 60g IDE / 1 x 40 g IDE
1 x DVD / 1 x lite on cdrw
7 case fans plus vantec dual fan pci card
BFG 6800 Ultra OC 456/1.28 Stock air
3.2P4(no OC)3dmark03 score :13570
http://service.futuremark.com/compare?2k3=3195131
3.2 p4 @3.472 217FSB 6800u@ 425/1.28 3Dmark03: 13738
http://service.futuremark.com/compare?2k3=3195221
WIFES PC: 3.2P4/BFG 6800GT/1 gig pc 3200
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Old 07-26-04, 07:10 AM   #74
r2d2d3d4d5
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Default Re: Power Supply / 6800 Series Sticky

Quote:
Originally Posted by kahloq
It might not be the PSU, you may have a faulty bios. Problem is, if you flash it and then it dont work and somehow you cant get it flashed back, then warranty is poof UNLESS you talk to your cards tech support first and ask them if they want you to try it. In any event, you should backup your current bios on the card.
It's an MSI card and unfortunately they only provide support via email and that is to their Taiwan Headquarters. I've emailed them describing the problem and I've had an auto-reply telling me to expect a reply within 48 hours.

I'll see what they have to say on the matter.

Given that some people have been using very low spec PSUs I had hoped that I would be able to run a NU on one of my two PSUs. But as you say it might not even be a PSU problem.

edit//
My mistake, MSI UK do provide Technical Support via an online form.
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Old 07-26-04, 09:07 AM   #75
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Default Re: Power Supply / 6800 Series Sticky

Quote:
Originally Posted by kahloq
Both of these power supplies are insufficient. The +12 on the Q-tec is only 14a(even tho peak is 20a peak is NOT a sustained lvl, but peak..ie maximum at one time)
The Aopen also is too low as the +12 is only at 15a. You need a PSU that carries at least 18a on the +12(and not just a peak rating but sustained).
Wattage of a PSU isnt the tell tale sign that its a good performer. AS you said the q-tec is a 550 watt PSU but it cant carry the load. I have a 420 watt PSU, but its +12 rail is 18a sustained.
The TrueBlue that I've now ordered carries 22A on the +12V rail (Max, not Peak). That should be more than enough for a NU.
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Old 07-26-04, 10:19 AM   #76
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Unhappy Will PSU hinder OC?

I have got a Leadtek 6800GT, well it runs very smooth so far with 61.76. However when i start OC it can only reach 393/1110. When the core up a little bit, artifacts start showing on the turtle of mother nature.
The xbitlabs can go up to 420 core
I start thinking is it my PSU limiting my OC, my PSU is some unnamed crappy one bundled with a $35 case...It now powering 2.4c with 2harddisk and a cd-rom drive, any ideas? Thx
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Old 07-26-04, 10:26 AM   #77
Clay
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Default Re: Will PSU hinder OC?

What is the amp rating on your 12v rail? You will want at least an 18amp rating from your PSU. Better yet, get a PSU with two 12v rails.

This shows you an example of the sticker on most PSUs indicating the amp ratings on each rail. The one from this exampmle has a 34amp rating which is insane, again just an example.
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Old 07-26-04, 10:28 AM   #78
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Default Re: Will PSU hinder OC?

it CAN limit it yes. because if you start ocing the watts being taken increases and such.
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Old 07-26-04, 11:22 AM   #79
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Default Re: Power Supply / 6800 Series Sticky

Quote:
Originally Posted by r2d2d3d4d5
It's an MSI card and unfortunately they only provide support via email and that is to their Taiwan Headquarters. I've emailed them describing the problem and I've had an auto-reply telling me to expect a reply within 48 hours.

I'll see what they have to say on the matter.

Given that some people have been using very low spec PSUs I had hoped that I would be able to run a NU on one of my two PSUs. But as you say it might not even be a PSU problem.

edit//
My mistake, MSI UK do provide Technical Support via an online form.
Some ppl have reported faulty MSI bios. If all else fails, and MSI tech doesnt help you, you can try flashing the bios with another vendors bios. Many ppl using Ultras and GT's have doen that and have gotten rid of their problems.
__________________
SPECS:
Alienware
3.4 p4 /200FSB NO overclock
OCZ pc3500 performance 2 gig memory
OCZ 520 watt PSU
Asus p4c800deluxe-e motherboard
2 x 80g Sata HD's / 1 x 60g IDE / 1 x 40 g IDE
1 x DVD / 1 x lite on cdrw
7 case fans plus vantec dual fan pci card
BFG 6800 Ultra OC 456/1.28 Stock air
3.2P4(no OC)3dmark03 score :13570
http://service.futuremark.com/compare?2k3=3195131
3.2 p4 @3.472 217FSB 6800u@ 425/1.28 3Dmark03: 13738
http://service.futuremark.com/compare?2k3=3195221
WIFES PC: 3.2P4/BFG 6800GT/1 gig pc 3200
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Old 07-26-04, 11:27 AM   #80
kahloq
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Default Re: Will PSU hinder OC?

Also, not all GT gpu's will overclock the same amount. Ultra's wont all OC the same either. Its the same story with the memory on the cards. Some will overclock higher then others even of the same board maker.
__________________
SPECS:
Alienware
3.4 p4 /200FSB NO overclock
OCZ pc3500 performance 2 gig memory
OCZ 520 watt PSU
Asus p4c800deluxe-e motherboard
2 x 80g Sata HD's / 1 x 60g IDE / 1 x 40 g IDE
1 x DVD / 1 x lite on cdrw
7 case fans plus vantec dual fan pci card
BFG 6800 Ultra OC 456/1.28 Stock air
3.2P4(no OC)3dmark03 score :13570
http://service.futuremark.com/compare?2k3=3195131
3.2 p4 @3.472 217FSB 6800u@ 425/1.28 3Dmark03: 13738
http://service.futuremark.com/compare?2k3=3195221
WIFES PC: 3.2P4/BFG 6800GT/1 gig pc 3200
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Old 07-26-04, 11:38 AM   #81
iwbs
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Default Re: Will PSU hinder OC?

Ah....My PSU doesn't even have a single sicker on it...
I know theres alot of luck involve in this, anyway i hope the situation will be better when i change a better PSU.
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Old 07-26-04, 12:08 PM   #82
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Default Re: GeForce 6800 power supply questions

Had a small LAN at my house this weekend, and a friend of mine brought his Watts Up!. It's a cool little meter than you plug between the load and the outlet, and it will give you all sorts of neat power usage info. We gamed for about 12 hours straight, and the max power draw for my system was 180Watts. Assuming an efficiency of 70% for my 200W supply (250 SilenX is 72%), that means my system was only using a max of 126Watts of power.

Specs:
SN45G with 200W supply (only 10A on the 12V rail, not sure of the others)
Athlon XP 2.0GHz (12x166)
BFG 6800GT OC (370/1000)
1GB Crucial
120GB Maxtor
Intel PCI Gigabit card
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Old 07-27-04, 09:02 AM   #83
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Unhappy Re: Power Supply / 6800 Series Sticky

Quote:
Originally Posted by kahloq
Some ppl have reported faulty MSI bios. If all else fails, and MSI tech doesnt help you, you can try flashing the bios with another vendors bios. Many ppl using Ultras and GT's have doen that and have gotten rid of their problems.
eBuyer sent out my PSU a couple of days early and it arrived today.

Unfortunately it has not made any difference. If anything the voltage rails have a slightly greater deviation from the normal than my Q-Tec had, but perhaps that's not important. The Antec is quieter however, which is nice.

So it does indeed seem like I have a faulty GC. I've yet to have a reply from MSI but the 48 hours are still not up.
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Old 07-28-04, 11:49 AM   #84
nibi
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Default psu to Point of View GeForce 6800 Ultra ?

hi all, I think pre-order a Point of View GeForce 6800 Ultra 256MB DDR3.
my psu is a levicom 420W but a I dont know if my psu is sufficient for this vga.
My combo are O/C (barton2600+@2300Mhz/1Gb ram 400 Mhz/Nforce2 Abit/2 HD-seagate barracuda 80gb and ibm 80gb/DVD-ROM A-106/DVD-RW A-05/watercooled system CPU ( HYDOR L-20 Pump )/Levicom 420 W
Thanks for your opinions and replies
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