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Old 10-31-04, 08:13 PM   #265
iansmith
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Question Re: GeForce 6800 power supply questions

Is the OCZ 520 worth an extra $40 over the 420? My +12 @ 13A is showing +11.50 but my multimeter is not with me so I can't verify it. Should I spend the extra $40 anyway?

I have a BFG 6800 Standard in a case with a pair of 250GB drives, CD-ROM and a Pentium 2.8e overclocked to 3.3GHz and want to overclock my 6800 as well. It's already running 16x1,6vp. Cable sistuation is not happy, the two HD's and 6800 are on one cable, CD and fans are on the other.

I do have a big question though that has troubled me. Everyone states you should use a dedicated molex cable for the 6800 and not share it with any drives. Is this really doing the good that is expected? Is it some sort of rule or standard that every cable out of a PSU is on it's own rail? What stops a PSU maker from having all the cables coming out of a PSU soldered together?

Take the OCZ 520W. Are the two VGA/HD cables on seperate rails, or are they all tied into a single output? Without taking a PSU apart and tracing the connections, is there any way to tell?
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Old 11-01-04, 12:44 AM   #266
kahloq
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Default Re: GeForce 6800 power supply questions

Quote:
Originally Posted by iansmith
Is the OCZ 520 worth an extra $40 over the 420? My +12 @ 13A is showing +11.50 but my multimeter is not with me so I can't verify it. Should I spend the extra $40 anyway?

I have a BFG 6800 Standard in a case with a pair of 250GB drives, CD-ROM and a Pentium 2.8e overclocked to 3.3GHz and want to overclock my 6800 as well. It's already running 16x1,6vp. Cable sistuation is not happy, the two HD's and 6800 are on one cable, CD and fans are on the other.

I do have a big question though that has troubled me. Everyone states you should use a dedicated molex cable for the 6800 and not share it with any drives. Is this really doing the good that is expected? Is it some sort of rule or standard that every cable out of a PSU is on it's own rail? What stops a PSU maker from having all the cables coming out of a PSU soldered together?

Take the OCZ 520W. Are the two VGA/HD cables on seperate rails, or are they all tied into a single output? Without taking a PSU apart and tracing the connections, is there any way to tell?
No you misunderstand. On PSU's, the +12 rail encompasses all the molex connectors from it. However, seperate molex lines are best, and using a completely separate molex line that has nothing else on it to power the 6800 gives it the cleanest power possible without any DRAIN from anyother devices on that line. Line is different from rail. If you have two strands of molex with each strand say having 4 molex plugs on them, then you have two lines. But they are all powered thru the +12. Now, with the OCZ series, there are two dedicated LINES(VGA/HDD) and those are specifically designed to give the best, cleanest power possible to the vid card. They also have rfi filters to elliminate any cross talk or noise.
As far as the difference between the 420 and the 520. The 520 has 33 amps on the +12. More then enough for what your running with room to spare. Good for future expandibility. The 420 has 30 amps on the +12. Still more then enough. However, the +3.3 and the +5 are lower on the 420. You will be fine with the 420, however, you may want to consider the 470 just for some headroom as it has the same 33amps on the + 12 as the 520. If your buying a new PSU, spend a few extra dollars to get the 470 or 520 so you'll have more headroom for future use.
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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 11-01-04, 07:09 AM   #267
sAnt@
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Default Re: GeForce 6800 power supply questions

I just ordered Gainward 6800 GT GS. Do you think my psu is sufficient?

Antec Smartpower 350W 16A on +12V rail.

SPECS:

xp-m2500+@2.4GHz
1024MB
1x160g IDE /1x40g IDE
1xCDRW
Asetek W/Cooling kt12A L20
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Old 11-01-04, 08:26 AM   #268
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Default Re: GeForce 6800 power supply questions

Quote:
Originally Posted by sAnt@
I just ordered Gainward 6800 GT GS. Do you think my psu is sufficient?

Antec Smartpower 350W 16A on +12V rail.

SPECS:

xp-m2500+@2.4GHz
1024MB
1x160g IDE /1x40g IDE
1xCDRW
Asetek W/Cooling kt12A L20
Probably OK. No harm in trying it.

Chip
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MSI K8N Neo 2 Motherboard
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Old 11-02-04, 11:09 AM   #269
iansmith
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Default Re: GeForce 6800 power supply questions

Thanks for clearing that up, kahloq.

I just checked with a imeter and the +12 is spot on. Still only rated at 13A and it's a no-name so I assume I should get a new supply. 30C case temp.

The voltage varies from 12.026 to 12.046 at idle and drops down to 11.885 running 3DMark05. Not knowing much about this, should it not move at all or is a little change like this expected? Should a better supply be steadier?
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Old 11-02-04, 11:51 AM   #270
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Default Re: GeForce 6800 power supply questions

Quote:
Originally Posted by iansmith
The voltage varies from 12.026 to 12.046 at idle and drops down to 11.885 running 3DMark05. Not knowing much about this, should it not move at all or is a little change like this expected? Should a better supply be steadier?
This is to be expected. Only the best power supplies don't budge when you load them. 11.885 is still very good. The ATX spec allows for a +- 5% variation from 12v. This is circa 1%.

Chip
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[COLOR=DarkRed][SIZE=1]BFG GF6800GT @ 420/1100
MSI K8N Neo 2 Motherboard
AMD A64 3200+ @ 10x240
1 GB PQI Turbo Memory 10-3-3-2.5 1T
2 x Raptor 74GB's in Raid0
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Old 11-02-04, 08:56 PM   #271
kahloq
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Default Re: GeForce 6800 power supply questions

Quote:
Originally Posted by iansmith
Thanks for clearing that up, kahloq.

I just checked with a imeter and the +12 is spot on. Still only rated at 13A and it's a no-name so I assume I should get a new supply. 30C case temp.

The voltage varies from 12.026 to 12.046 at idle and drops down to 11.885 running 3DMark05. Not knowing much about this, should it not move at all or is a little change like this expected? Should a better supply be steadier?
Unless you start running into problems you should be ok. That 13a on the +12 really worries me tho. So if you haven't installed a new gen graphics card, you'll msot likely continue to be fine, However, once you put in a new card, you may experience some issues.
If you do decide on a new PSU, again I recommend OCZ no matter what wattage choice of the three 420/470/520
__________________
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 11-02-04, 09:07 PM   #272
iansmith
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Default Re: GeForce 6800 power supply questions

The numbers I measured were from a BFG 6800 OC card.

It runs without any problems at stock (for BFG) speeds. If I bump either the GPU or memory more than 25MHz higher I get errors. All 16 pipes are enabled.
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Old 11-03-04, 08:44 PM   #273
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Default Re: GeForce 6800 power supply questions

Hi everybody, Well im running a 2 hdd's one dvdrw "ive got a second but not enough power for both at the moment" a 6800GT SB Audigy 2 athlon 64 3400, id like to shove in at least one more hard drive in as well as get my second dvdrw going, any recommendations for a PSU, I live in Nottingham and would like to get something without having to order it from another town.

My budget at the moment is about 40.00
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Old 11-04-04, 02:42 AM   #274
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Default Re: GeForce 6800 power supply questions

Quote:
Originally Posted by ray_uk
Hi everybody, Well im running a 2 hdd's one dvdrw "ive got a second but not enough power for both at the moment" a 6800GT SB Audigy 2 athlon 64 3400, id like to shove in at least one more hard drive in as well as get my second dvdrw going, any recommendations for a PSU, I live in Nottingham and would like to get something without having to order it from another town.

My budget at the moment is about 40.00
Two comments:

1. Why on earth does it have to come from Nottingham? Surely you can order online and get it delivered?

2. You can't buy a PSU that's worth "upgrading" to for 40. Whatever you bought, it wouldn't be much of an upgrade. If you really must buy one now and you really must only spend 40, have a look on ebay and see if you can get a second-hand Antec or Enermax or something. But not an old one: they used to have more output on the 5v rail, rather than the 12v. But in any case, for god's sake don't buy a no-name PSU or a Qtec. Chances are it would be worse than what you have now.

Chip

EDIT: I take it back. You can't buy a good PSU for 40 even on ebay. I just checked.
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[COLOR=DarkRed][SIZE=1]BFG GF6800GT @ 420/1100
MSI K8N Neo 2 Motherboard
AMD A64 3200+ @ 10x240
1 GB PQI Turbo Memory 10-3-3-2.5 1T
2 x Raptor 74GB's in Raid0
OCZ Powerstream 520w PSU
[/SIZE][/COLOR]
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Old 11-04-04, 03:49 AM   #275
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Talking Re: GeForce 6800 power supply questions

The reason I dont want to have to order one is that when something potentially goes wrong with it, I dont want to have to be stuck with a pc without a power suplly because ive had to mail it of to where ever.
Which in effect means that id have to keep a backup, or get something locally and be able to get it swaped out in a matter of minutes.

And yes I know that 40 pounds isnt a lot for a psu, but I was just really trying my luck to see if anyone out there has come across something reliable at that price.

Yeah I supose I could wait a while longer and shell out about 80 to a 100 for something like an enermax.

Doesnt hurt to ask.
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Old 11-04-04, 04:37 AM   #276
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Default Re: GeForce 6800 power supply questions

Quote:
Originally Posted by ray_uk
Doesnt hurt to ask.
Sure. I hope I didn't sound too critical - I didn't mean to.

Chip
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[COLOR=DarkRed][SIZE=1]BFG GF6800GT @ 420/1100
MSI K8N Neo 2 Motherboard
AMD A64 3200+ @ 10x240
1 GB PQI Turbo Memory 10-3-3-2.5 1T
2 x Raptor 74GB's in Raid0
OCZ Powerstream 520w PSU
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