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Crossfire 7750 with 7770 of different brands

Last response: in Graphics & Displays
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March 31, 2013 1:04:08 AM

Hey Guys i want to crossfire my Powercolor 7750 with Msi 7770 OC is this possible with my 550W PSU and i5-3450 - 3.1 GHz.Please Reply
March 31, 2013 1:11:08 AM

Probably, though a crap/junk 550W will have issues. Does your motherboard support CF?
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March 31, 2013 1:12:27 AM

4745454b said:
Probably, though a crap/junk 550W will have issues. Does your motherboard support CF?


Yes it does support my motherboard is gigabyte b75m-d3h
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March 31, 2013 1:16:19 AM

4745454b said:
Probably, though a crap/junk 550W will have issues. Does your motherboard support CF?


And also is with crossfire of 7750+7750 will be similer to 7750+7770 as some people are saying it will be same
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March 31, 2013 1:17:10 AM

The only remaining question then is your "550W" PSU. I think you are looking at around a 300W load, might be a touch more. Assuming your 550W PSU can do that on its 12V rails you should be good.
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March 31, 2013 1:40:00 AM

That board is a 16x/4x when it comes to CF. It shouldn't make a big difference on these cards though.

Also, the benchmarked power draw of a single 7770 is 250 watts at load. The 7750 is 216 watts. Overclocked, add 10+%. It may work on even a quality 550 watt, but that is running max load on a PSU, and that's not a good idea. I predict an unstable system if you go this route.
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March 31, 2013 2:05:56 AM

Quote:
Also, the benchmarked power draw of a single 7770 is 250 watts at load. The 7750 is 216 watts.


No they aren't. That's system power, not power for the card. The 7750 doesn't have any extra power plugs on it, so its HAS to consume no more then 75W. I think its rated at around 65W. The 7770 is around 100W.
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March 31, 2013 2:14:04 AM

^
hd 7750 - 55w tdp

hd 7770 - 80w tdp
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March 31, 2013 2:17:22 AM

Or those numbers....
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March 31, 2013 2:38:31 AM

So what you guys suggesting is that i can crossfire 7750 with 7770 with my 550W PSU on not?
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Best solution

March 31, 2013 3:00:52 AM

550w should be enough. When you crossfire make sure to have the stronger card (7770) in the primary PCI-E x16 slot. Also you might want to start with both cards at factory speeds, as I don't think overclocking 2 different GPU of different speeds is a good idea.
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March 31, 2013 4:08:41 AM

Did you not read my answer?

Quote:


The only remaining question then is your "550W" PSU. I think you are looking at around a 300W load, might be a touch more. Assuming your 550W PSU can do that on its 12V rails you should be good.


Just telling us a 550W doesn't tell us much about the PSU. The vehicle has four wheels. Is it good for freeway speeds and 30MPG?

Edited for spelling. Stupid spelling....
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March 31, 2013 12:32:11 PM

4745454b said:
Quote:
Also, the benchmarked power draw of a single 7770 is 250 watts at load. The 7750 is 216 watts.


No they aren't. That's system power, not power for the card. The 7750 doesn't have any extra power plugs on it, so its HAS to consume no more then 75W. I think its rated at around 65W. The 7770 is around 100W.


You're right, my bad. I thought that was awful high. I guess I was awful high.
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