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Crossfire Asus 5770

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December 9, 2009 4:27:13 AM

Hi guys,

I am considering to drop in another Asus 5770 on my 2 weeks old new rig (i7 920, P6T SE mobo, Asus 5770).

From the look of the motherboard P6T SE with single 5770, it seems like there's hardly enough space for a 2nd 5770 to be put in the 2nd PCI-E 16x slot, anyone try doing crossfire with Asus 5770 on a P6T SE before?

I'd want to make sure before I order another one and only find out that it's not working.

Thanks.

More about : crossfire asus 5770

a b U Graphics card
December 9, 2009 4:30:47 AM

Even if there is space, they maybe very close to each other which may lead to clogged air flow and heating! So make sure you have fans and other cooling mechanisms in order!

Take a scale and measure the width of the current 5770 and analyze if its gonna fit into the second slot! Simple :kaola: 
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a c 376 U Graphics card
December 9, 2009 4:49:14 AM

That board actually has 3 PCI-e x16. I'm believe you should be able to use the 1st and 3rd slots but I'm not absolutely certain.
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December 9, 2009 5:04:23 AM



From the manual of P6T SE:
PCIe 2.0 x16_1 slot ( blue, at x16 link)
PCI Express x1_1 slot
PCIe 2.0 x16_2 slot ( blue, at x16 link)
PCI slot 1
PCIe 2.0 x16_3 slot( white, at x4 link)
PCI slot 2

Does that mean I wouldn't get full performance if I put the 2nd card on the 3rd slot?

It looks like it can fit in...just that I'd be glad to have some advice from anyone who has tried it in terms of clogged air flow and heating. I'm using a HAF932 if that matters.

hell_storm: I ought to do that once I reach home after work XD
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a c 376 U Graphics card
December 9, 2009 5:11:08 AM

Yeah, looks like you'll want the first 2 slots to avoid that x4. The good news is that the HD5770 runs quite cool so hopefully it won't be that big of an issue.
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a c 147 U Graphics card
December 9, 2009 11:36:44 AM

You're worst enemy will be heat. I tried to Crossfire (2) 4870's on a P6T and had HORRIBLE heat issues with the top card. Granted this was a 4870 which runs hotter than a 5770. However, I am just telling you my experience with a dual card setup. If there is an extra space between the cards you tend to have less heat issues because the air can circulate. However, when they are tight against one another you have to make sure the top card has fresh air to suck in, not the hot air from the card below.

Just stuff to consider.
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a c 147 U Graphics card
December 9, 2009 1:00:33 PM

^ that might be worst case scenario. Not sure how bad the 5770's heat up with 2 in there. You can always add the second and go from there. Just keep my comments in mind.
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December 21, 2009 5:33:36 AM

Thanks for the info guys ( and sorry for the late reply ).

Putting it at the 4x lane is not recommend at all for crossfire? I remember seeing one of the review on 3dgurus saying the performance lose is only a few percentage margin
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March 5, 2010 11:28:46 PM

my 5770's on my board don't even get warm 790xt-ud4p also antec 300 case with 4 120mm antec fans and 1 140mm in the top... at 960/1300 and AUTO fan speed my top card only hits like 82 or 83 degrees celcius after half hour of furmark... gaming has never broken 70 degrees... V2 sapphires... nice cards
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March 9, 2010 1:36:19 PM

I have the Asus P6T SE board with 2 x 5770 crossfired. I am using the first and 2nd slots, both cooler are Zalman VF900 all copper.

Idle for 2nd card is around 37c, 1st card is around 44c. Under load, my 1st card gets in the 80s. 84c or so. 2nd card stays cool at around 58c.

From what i've seen with the PCI-E 2.0 x4 slots, the performance loss is very minimal. Issue right now for me is finding a longer cross fire cable.

There was a scaling test done with a 5850 somewhere, shows that in cross fire with 1 x16 with 1 x4 (PCI-E 2.0) slots running at 1920x1200...you still get 96% of the 2nd card.

Now with a 5770, i would assume you would lose even less if anything at all. Now just have to find the longer cable.

That being said, anyone want to donate a longer cross fire cable for "testing" purposes? :) 

Hope that helps.

-D
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