Can this power supply handle dual 8800 GTX?

Hanzu · 02-26-2007, 02:21 PM

well, its kind of too late, i already have the power supply, im not sure if its the power supply or not, but everytime i run 3dmark in sli mode, the things shuts my computer off instantly after the first test. but when i turn off sli mode, it runs just fine.

here is the power supply i have

http://www.newegg.com/Product/Produc...82E16817341003

please let me know, i was told it should, but do you its a problem related other then just the power supply?

THanks

ghost · 02-26-2007, 03:46 PM

Yeah I think your PSU isnt up for the job, on BFG website they recommend a PSU with 450W 30A on a +12v rail (single card).

Your PSU only has 20A, so im guessing thats your problem.

lhuser · 02-26-2007, 04:04 PM

They recommend, but it should work. I don't quite know how affective the Amps can affect a GPU's performance, but to my book, it should be alright. If not, then wait a bit more for two 8600 series.

Hanzu · 02-26-2007, 09:26 PM

Quote:

Originally Posted by ghostfacesuk

Yeah I think your PSU isnt up for the job, on BFG website they recommend a PSU with 450W 30A on a +12v rail (single card).

Your PSU only has 20A, so im guessing thats your problem.

yeah

with out sli, 3dmark runs fine, compelete test
but when i turn the sli on.
boom, system shuts off in the middle of that test.. actually. after test 1, when the screen switches, the whole thing just shuts off

joeswm8 · 02-27-2007, 02:38 AM

woah waoh woah

the combined amperage on the 12v rail is more than up to the task. That PSU should easily handle it, and i have seen it do so in many magazines.

the OCZ GameXStream 850w should easily handle it

**ceewi1** · 02-27-2007, 07:53 AM

The recommendation is for the total +12V amperage not the amperage available on any single +12V rail. That PSU is more than capable of handling the load, although it is, of course, possible that you simply have a defective unit.

I take it that you've used adapters to form two more PCI-E connectors, so that you have 2 PCI-E connectors in each card? Are you having problems in games (i.e. not just 3D Mark)?

EDIT: You don't have a large drive array or anything like that that's not mentioned in your sig do you?

Hanzu · 02-27-2007, 01:27 PM

Quote:

Originally Posted by ceewi1

The recommendation is for the total +12V amperage not the amperage available on any single +12V rail. That PSU is more than capable of handling the load, although it is, of course, possible that you simply have a defective unit.

I take it that you've used adapters to form two more PCI-E connectors, so that you have 2 PCI-E connectors in each card? Are you having problems in games (i.e. not just 3D Mark)?

EDIT: You don't have a large drive array or anything like that that's not mentioned in your sig do you?

hmm
i have 2 connectors coming out of each card....? there was suppose to be just one coming out of each card? i sthat what your saying?

MatrixEVO · 02-27-2007, 04:44 PM

Quote:

Originally Posted by Hanzu

hmm
i have 2 connectors coming out of each card....? there was suppose to be just one coming out of each card? i sthat what your saying?

Are you using adapters that have the 6 pin PCI-E on one end and two 4 pin molex connectors on the other end? If you are, then you should be using the two PCI-E connectors coming DIRECTLY from the power supply.

MatrixEVO · 02-27-2007, 04:51 PM

Quote:

Originally Posted by MatrixEVO

Are you using adapters that have the 6 pin PCI-E on one end and two 4 pin molex connectors on the other end? If you are, then you should be using the two PCI-E connectors coming DIRECTLY from the power supply.

I just realized that your cards require 2 PCI-E connectors each, which totals to 4 of them. Your power supply has only 2. I'm not 100% sure if it's better to use individual PCI-E connectors, but if it is, then you should have gotten a PSU with 4 connectors:

CLICK

_______________

**ceewi1** · 02-27-2007, 10:21 PM

Quote:

Originally Posted by Hanzu

hmm
i have 2 connectors coming out of each card....? there was suppose to be just one coming out of each card? i sthat what your saying?

You should have two connectors coming out of each card - use the two native PCI-E cables and two molex to PCI-E adapters to get the 4 PCI-E required. If you'd only plugged in one, the GPUs would be receiving insufficient power.

Quote:

I just realized that your cards require 2 PCI-E connectors each, which totals to 4 of them. Your power supply has only 2. I'm not 100% sure if it's better to use individual PCI-E connectors, but if it is, then you should have gotten a PSU with 4 connectors:

I would have preferred to see 4 native connectors, but what he has should work without issues.

02-26-2007, 02:21 PM	#1 (permalink)
Hanzu Silver Member Join Date: Apr 2006 Posts: 215	Can this power supply handle dual 8800 GTX? well, its kind of too late, i already have the power supply, im not sure if its the power supply or not, but everytime i run 3dmark in sli mode, the things shuts my computer off instantly after the first test. but when i turn off sli mode, it runs just fine. here is the power supply i have http://www.newegg.com/Product/Produc...82E16817341003 please let me know, i was told it should, but do you its a problem related other then just the power supply? THanks __________________ Desktop \|Laptop NVIDIA nForce 680i (eVGA) \|Intel 4965 WLAN 802.11 QX6700 2.66GHz OCed 3.50 \| Intel 2.8GHz,EZX, 4MB, 800 FSB 4GB RAM 1066MHz (Dominator) \| 4GB, DDR2, 667MHz x2 8800 GTX \| x2 8800M GTX 1gb 300GB 10,000 RPM \| x2 200GB 7200rpm X-Fi Fatal1ty \|Integrated Sound Blaster Audigy Vista Ultimate x64 \|Vista Ultimate x32

02-26-2007, 03:46 PM	#2 (permalink)
ghost Diamond Member Join Date: Sep 2005 Posts: 1,960	Yeah I think your PSU isnt up for the job, on BFG website they recommend a PSU with 450W 30A on a +12v rail (single card). Your PSU only has 20A, so im guessing thats your problem. __________________ ASUS A8N SLi Deluxe Corsair 2GB DDR XMS3200XL Pro TwinX (4x512MB) AMD Athlon 64 X2 939 4600+ @ 2.6 Ghz ATi Radeon HD 3850 @ 680/844 80GB SATA HDD/200GB PATA HDD 1x DVDRW DL 485W PSU, Alpha watercooling

02-26-2007, 04:04 PM	#3 (permalink)
lhuser Silver Member Join Date: Feb 2006 Location: Canada Age: 19 Posts: 226	They recommend, but it should work. I don't quite know how affective the Amps can affect a GPU's performance, but to my book, it should be alright. If not, then wait a bit more for two 8600 series. __________________ Main Rig: E8400 / CM GeminII cooler / 4GB RAM DDRII-667 / Geforce 8600GT 512M / CM CM690 Case / 430W PSU / P5E-VM DO (ugh) / 2x160GB HDDs) / Vindows Vista Business x86_64 Secondary rig: *X2 6400+ / 2GB RAM DDRII-800 / Geforce 6100 (to upg) / Xblade Case / 420W PSU (BS) / 2x250GB / M55Plus-S3G / Vista Business x86_64* To upgrade: Main = 8GB RAM DDRII-1200 / New board / New PSU? Sec = 8GB DDRII-1200 / 3x250GB RAID 5 / New PSU

02-27-2007, 02:38 AM	#5 (permalink)
joeswm8 Diamond Member Join Date: Nov 2006 Location: IL Age: 16 Posts: 1,543	woah waoh woah the combined amperage on the 12v rail is more than up to the task. That PSU should easily handle it, and i have seen it do so in many magazines. the OCZ GameXStream 850w should easily handle it __________________ Free Online Games ---New Computer---Server Build --X2 3800+@2.5---E6600@3.4 XFX 7900GS Extreme---eVga 7600GS--- ------2GB G.Skill DDR2-800---4GB Corsair DDR2-800 Biostar TForce 550MCP---eVga 680i-------- ------WD 160GB HDD---2x74GB Raptors -----------------Rosewill 550W---OCZ 700W GameXStream Centurion 5---P180B

02-27-2007, 07:53 AM	#6 (permalink)
ceewi1 Moderator Join Date: Dec 2005 Location: Melbourne, Australia Age: 21 Posts: 5,184	The recommendation is for the total +12V amperage not the amperage available on any single +12V rail. That PSU is more than capable of handling the load, although it is, of course, possible that you simply have a defective unit. I take it that you've used adapters to form two more PCI-E connectors, so that you have 2 PCI-E connectors in each card? Are you having problems in games (i.e. not just 3D Mark)? EDIT: You don't have a large drive array or anything like that that's not mentioned in your sig do you? __________________ CPU: Core 2 Duo E6600 / MOBO: Gigabyte 965P-DS3 / GPU: Gigabyte HD4870 RAM: 2GB G.Skill F2-6400CL4D-2GBPK / HDD: 2TB Total HDD / PSU: Antec NeoPower 480W Cheap PSUs - 2% of system costs, responsible for 28% of system deaths As Sealed Stick was removed, lost or damaged, it shall be out of warranty validity. - The "Warranty void if removed" sticker on numerous CoolerMaster PSUs. Useful PSU Guides Last edited by ceewi1; 02-27-2007 at 08:13 AM.

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