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MSI 7770 Graphics Card with a 350 watt PSU

Last response: in Graphics & Displays
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November 8, 2012 11:52:59 PM

I've got an old Dell 8900 that I'm working on with Linux and GPU password cracking. I ended up with the MSI 7770 Graphics Card (and a new 500 watt power supply that of course doesn't fit....thanks dell....). The question I have: If I pull the power from all other peripherals, is there any way I would be able to get the MSI 7770 to work on this computer without a higher power supply? Or am I pretty much SOL?
a c 80 ) Power supply
a c 110 U Graphics card
November 8, 2012 11:57:08 PM

Full specs please and most important, how many amps @ 12 volts does it have.
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November 9, 2012 12:06:29 AM

+12VA and +12VB show 18amps
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November 9, 2012 12:13:39 AM

I figure I'll ask this, though I'm guessing the answer.

"What about running the dell power supply to power the CPU, and the new power supply to power the board?" I could care less about the CD Drives/Floppy Drives.

Really the only component on the new PSU that doesn't fit is the one right near the CPU (which I presume powers the CPU?)
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a b U Graphics card
November 9, 2012 12:31:19 AM

Unless your CPU needs 200w, which it doesnt, the 350w PSU will be sufficient for a 7770. It might cut it close under heavy loads but it will work.
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November 9, 2012 12:42:59 AM

stickg1 said:
Unless your CPU needs 200w, which it doesnt, the 350w PSU will be sufficient for a 7770. It might cut it close under heavy loads but it will work.



It's a Pentium 4, I wouldn't think it needs very much. The only other option would be to partially plug in the cpu adaptor.
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a b U Graphics card
November 9, 2012 12:55:20 AM

Yeah 350w will work. I ran one with a FX8150 on a 380w psu. No problems, the fx CPU used way more power than yours.
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November 9, 2012 2:15:23 AM

Edit: I spoke too soon, I was missing a connection. In the case I do ever want to upgrade to a newer PSU. IS there any chance I'd be able to rig it somehow (either with a 6 pin>>4 pin adapter, or something)? Or would that destroy this mobo?
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a c 80 ) Power supply
a c 110 U Graphics card
November 9, 2012 2:46:04 AM

Unless I miss hear you(what exactly is missing? the 6 pin PCI-e?).
They sell a 2 x 4 pin molex to 6 pin pci-e adapter and I would guess every card I EVER picked up came with them :) 

That card is "just" over the 75 watt limit for no plug. so that should not be an issue.

To be honest, I had been looking at 7770's for my media center to replace its 5770. I was hoping to get a passive one, but the 650ti is looking awful tempting with lower blu-ray/dvd power consumption(and what seems to be a very quiet fan). Either way that system is rocking a 300 watt(22 amps combined 12 volt rail) power supply :) 

That was why I wanted exact specs, because that(my media center) system was built around the 300 watt power supply(and has not pulled more then 180 watts at the wall EVER. Average gaming was about 140-160).
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a b ) Power supply
a c 87 U Graphics card
November 9, 2012 3:07:19 AM

I wouldn't go past the 7750 800MHz on that PSU with your system, but that's me.
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November 9, 2012 3:30:16 AM

It worked, I had missed plugging something in. I just deactivated the CD drives and the Floppy Drives. So all it's running are the necessities. Fan, CPU, GPU, MOBO/USB. No Flames yet :-). As far as my question about upgrading...since dell has a proprietary power outlet on the mobo for the CPU (Dell's is a 4 pin, and the ATX I guess is 6 pin), would getting an adapter and using that kill the mobo? I've read mixed reviews.
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a c 80 ) Power supply
a c 110 U Graphics card
November 9, 2012 3:46:42 AM

Please get some pictures of those plugs.

For CPU power they have both 4 pin and 8 pin on modern power supplies. The 8 pin's generally split into 2 4 pins allowing the one sides 4 pins to be used on older boards while being able to also be used for the newer 8 pin cpu power connectors.

6-pin/8pin(sometimes 6+2) is for video cards.

20/24 pins are for the motherboard. This is the same, The last 4 pins can be separated from the other 20 to allow use on older boards.

Watch out as some older boards used -12 or -5 volts that may not be present on all newer power supplies.
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November 9, 2012 5:12:12 AM

nukemaster said:
Please get some pictures of those plugs.

For CPU power they have both 4 pin and 8 pin on modern power supplies. The 8 pin's generally split into 2 4 pins allowing the one sides 4 pins to be used on older boards while being able to also be used for the newer 8 pin cpu power connectors.

6-pin/8pin(sometimes 6+2) is for video cards.

20/24 pins are for the motherboard. This is the same, The last 4 pins can be separated from the other 20 to allow use on older boards.

Watch out as some older boards used -12 or -5 volts that may not be present on all newer power supplies.


Here's the original PSU:



Here's the new one:



The new one has the cpu cord labeled. (It's a 6 pin)

Here's the dell cpu cord:



Make sense of all that?
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November 9, 2012 8:32:20 AM

It seems you can use that power supply for your hD 7770.
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a c 80 ) Power supply
a c 110 U Graphics card
November 9, 2012 12:27:36 PM

That is not your average pre-built 350 watt power supply. 28 amps or 336 watts of its total power can be delivered to its 12 volt lines :) 

I need pics of this 6 pin, because the Dell 4 pin you show is perfectly normal for boards of its age.

This is all I see for your power supply on Newegg. and it is "only" 72 watts more powerful on its 12 volt rail then the stock unit.
Power | 4 + 4 pin cpu | 8 pin PCI-E | 6 pin PCI-E | Molex LP4 | Floppy | SATA


For reference, I pulled up a LGA775 board that has the same 4 pin connector.
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a c 80 ) Power supply
a c 110 U Graphics card
November 10, 2012 8:17:25 PM

Yeah, its a standard power supply.

While not all cases use the same size(Like how many SFF cases will have an SFX power supply) of power supply, the connectors are the same most of the time now. In the early days, many companies had different connectors and whatnot.
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November 11, 2012 12:38:00 AM

Best answer selected by expphoto.
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