Crossfire 7750 with 7770 of different brands

jay1312 · Mar 31, 2013

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

4745454b · Mar 31, 2013

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

jay1312 · Mar 31, 2013

4745454b :

Yes it does support my motherboard is gigabyte b75m-d3h

jay1312 · Mar 31, 2013

4745454b :

And also is with crossfire of 7750+7750 will be similer to 7750+7770 as some people are saying it will be same

4745454b · Mar 31, 2013

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.

festerovic · Mar 31, 2013

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.

4745454b · Mar 31, 2013

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.

ASHISH65 · Mar 31, 2013

^
hd 7750 - 55w tdp

hd 7770 - 80w tdp

4745454b · Mar 31, 2013

Or those numbers....

jay1312 · Mar 31, 2013

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

huilun02 · Mar 31, 2013

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.

4745454b · Mar 31, 2013

Did you not read my answer?

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....

festerovic · Mar 31, 2013

4745454b :

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

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