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MSI ATI 6790 + Weak PSU

Last response: in Graphics & Displays
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July 22, 2011 1:27:35 PM

Hello,

Recently I purchased an ATI 6790 to replace my current 4850. Upon arrival I realized that the 6790 required 2 6 pin connectors to the psu, but the card also came with 2 6 pin to 2 molex connectors.

This is where my issues arise. My PSU is a cheap Powerstar PS-600, and it currently only has 2 free 4 pin molex connectors (2 short of what I need).

Now, the only reason I bought the 6790 as opposed to the 6850 was because it was roughly 20$ cheaper and I am on a budget...

So now, I need to figure out how to remedy this issue.

Should I:

Return the 6790 to newegg at a restocking fee and purchase the 6850?

Upgrade my PSU (possibly costing me more than the previous option)

Buy two 1 to 2 molex spliters and have a mess in my pc/run the risk of overdrawing cables and melting something.



Other information:

The pc will be running 8 gigs of ddr2 5-5-5-18, a 320gig hdd and a 1tb hdd, an intel e8400, a single cd/dvd combo, and a stand alone lan card. <---Do I even have enough power for all of that + the 6790?

Bear in mind that I'm pretty limited for cash, so I really would like to run the cheapest option possible.

More about : msi ati 6790 weak psu

a b U Graphics card
July 22, 2011 2:08:12 PM

Doesn't the the HD 4850 use one PCI-E connector by itself, and if you use one PCI-E connector, then you could use that one in the HD 6790, and use two 4pin molex connectors to make the other 6pin PCI-E connector and put them in the HD 6790?
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July 22, 2011 2:31:13 PM

You are right that the 4850 uses a single pci-e connector; however, my computer was pretty interesting when I first took a look inside.

My 4850 was running using a single PCI-E to molex, instead of duo PCI-E to molex. It was interesting to say the least, but end of story I do not think my PSU has any PCI-E connectors, and I do not wish to run the 6790 using PCI-E to single molex connectors, both for safety, and because it may not have enough power.
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July 22, 2011 2:43:57 PM

Sorry, I forgot to mention that I am Canadian, and so I must order through newegg.ca, tigerdirect.ca, or ncix.com
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July 22, 2011 2:45:06 PM

Also, does your previous post imply that using 4pin molex splitters to effectively double up the amount of 4pin molex connectors is a bad/not feasible idea?
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a b U Graphics card
July 22, 2011 2:55:47 PM

I'm not sure, I hav't known anybody who has used splitters to multiply the same cable type, I'm not saying it wouldn't work, I'm saying your actual power supply would not be able to power the card, and if it would be able to power it, it would degrade the power supply by running at such a high usage level (80-90%), and the splitter would draw a high current from your mains supply.

Here's the best one I could find for under $50, you would still need to use a molex adapter though.

Corsiar BD CX430 430W 80 Plus Continuous w/ 28A on +12V Rail.

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July 22, 2011 3:06:12 PM

If there is something significantly better for no more than 10-15$ more I would also be fine with that. I'm always just worried that I'm not going to have enough connectors for the 2 hd's, and cd drive if I also would need 2 4-pin's just for a 6pin connector.

Thank you for the help so far as well!!!
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a b U Graphics card
July 22, 2011 5:29:29 PM

Oh, whoops.
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