Network card not working when I put in new GPU

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dhlord64
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Long story short, I put an evga gts 250 512mb ddr3 gpu in to my computer, replacing a evga 9800 gt, and the network card doesn't work anymore. I put the old gpu back in and the network card worked. I tried uninstalling and reinstalling drivers, nothing worked.

Now here comes the long story,

Before that, I had a different wireless network card in there (Rosewill wireless LAN card). It worked perfectly with a 9800 gt. When I put the 250 in there things got ugly. The computer would RANDOMLY freeze while doing SIMPLE tasks. Yet I managed to play demanding games PERFECTLY (if I could get to them before it froze). When I quit a game, shortly after it would lock up and I would have to reboot manually.

So I put in a different network card (Linksys WMP54G v4.1) and it worked initially then it stopped picking up signals. It would say it's there but it wouldn't pick up any signals AT ALL.

This is the most annoying occurrence of events I have ever had with a computer. It got so bad I thought it could be anything causing it. What is strange is when I had the Rosewill card in the pc it continued to freeze when the 9800 was still in. There was NO pattern it seemed. Nothing adds up. THe gpu plays games well with no crashes at all.

I did try different pci and pci-e slots for all the cards and it made no difference. I have the msi 790xt-g45 motherboard.

I have a Cooler Master ELITE 460w psu. The 250 needs 450 watts. This psu only has 70 percent efficiency. The only LOGICAL conclusion I can draw from this is that the network card isn't getting enough power, therefore I need a better psu. It's the only thing that makes sense. My friends were also baffled and they agreed that the only thing logical would be the psu lacking sufficient power. I have spent the last 3 days baffled after one thing to another.

Currently the pc is working normally, it's just I have to use a laptop as a router and that laptop isn't mine.

noir2525
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The answer is ur psu is not giving enough power. When u install a higher end graphics cards and it over draws on psu in amperage or wattage something is bound to give out in power supply. well that psu only gives 324watts on the 12v rail that powers everything in comp.

Most cards are happy with 30amps on 12v rail and ur psu supplies 18amps ur a bit short there but u have 2 18amp 12v rails on ur psu. U can get a 2 molex to one 6pin adapter and connect one molex on each rail to get a total of 36 amps to power the vid card. It should work.

If that dosen't work out for u get a new psu that is 80+ cert and has a single 12v rail.

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dhlord64
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Ah yes that makes perfect sense. Thanks a ton! I knew it had something to do with rails. I am debating to get a connector (or find one) or get a new psu. I would want at least a 650 watt for future upgrades.

I just looked at the psu. I only see one rail (is that a rail?) that has all the molex plugs on it.

EDIT:

Here is the best cheapest one I could find. Is it good enough?
http://www.microcenter.com/single_product_results.phtml?product_id=0328088

Tivon
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I'm not familiar with the brand, but everything listed in the specification is good.

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dhlord64
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The 2 molex to 6 pin adapter didn't work as there is only 3 molex plugs on a single rail. Sooo I have to get a power supply. I am going to get the one I linked, next Friday. Possibly a 750 watt one as I may upgrade in a few months.

GraysonPeddie
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As a general rule, you must subtract just a few amps from 2+ +12v rails. Even with 18 amps per rail, you may only get about 32 or 33 amps, depending on how well the power supply can handle.

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dhlord64
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I put in a Rosewill (Hit or miss brand but this series is supposed to be good) Green Series 700 watt 80 PLUS BRONZE certified psu with 54 amps on a single 12v Rail...the network card still can't pick up any signal....WHAT THE HELL...I'm about to toss this out the window...Tired of this BS
Nothing makes any sense, I am beyond baffled.

dhlord64
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I put the old gpu in and everything works fine. Doesn't make any sense since the pc is getting plenty of power.

Hmmm...would changing the PCI latency do anything? I read a review with someone with the same mobo and they had some issue and resolved it by loosening the PCI latency.

EDIT UPDATE: tried PC latency of 32 and it worked for 2 hours but failed eventually.

Now the PC isn't even recognizing the network card anymore. I put the 250 back in btw when I tried PCI latency. I'm starting to think it's the mobo now...just great. Could it be the gpu? I'm about to just go get a usb network adapter.

Help...

Tivon
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Chances are there is something wrong with that network card. Yeah, try a usb network card and bypass any of that bs. I guess you tried installing the card in one of the other slots already.. It looks like a power problem, but perhaps it could be something else like an IRQ or resource conflict.. And you said you tried another network card with other problems.. maybe a problem with windows or the wireless router maybe.

dhlord64
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I think the most logical conclusion is that it's an IRQ or resource issue. I can't change the IRQ of anything because of Windows 7 apparently. I went ahead and bought a USB wireless LAN adapter and it works great. I still want to fix this problem because I may want to put a sound card in there eventually.

The video card is on IRQ 18 and it is shared with 3 (PCI) Standard OpenHCD USB Host Controllers. The LAN card isn't in there so I don't know what IRQ it was