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Dual 5770 questions and issues

Last response: in Graphics & Displays
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January 21, 2010 4:59:48 PM

I am new to the foums. I read as much as I could before I got confused.

So I drank the kool-aid and went for a dual 5770 GPU set up. I got a really good discount from a corporate account so I went for it. I am not a guru with PCs but I can put one together and install basic stuff (OS and basic programs). Here are some of my issues and questions (AMD/ATI tech support didnt help):

My MB is crossfie ready and I have both crossfire cables connected.

I have (3) 19 inch LCD monitors in 1680x1050. Two hook up to DVI and work in that resolution. The 3rd with the "active dp to dvi adapter" only lets me got to 1400x900 on that monitor. If I go any higher res I get the black screen flashing. I tried older versions of drivers, and I tried ultramon as well and no help to the issue.

Is this due to having both GPUs connected?
Is there supposed to be a driver coming out to fix this?
Would my system work better w/o the 2nd GPU until such an updated driver does come out?

Any info on this or in general would be greatly appreciated.


This is my set up in a nutshell:

ASUS M4A79XTD EVO
(2)Sapphire Tech 100283VXL (crossfire)
AMD HDZ965FBGMBOX
Kingston Technology Corp. KVR1333D3K2/4GR
Seagate ST31500541AS
Cooler Master RR-UV8-XBU1-GP
(2)Western Digital VelociRaptor WD3000HLFS 300GB 10000 RPM
(3) ASUS VW198T Black 19" 5ms Widescreen LCD Monitor


Thanks all.
a b U Graphics card
January 21, 2010 6:09:07 PM

Check your Catalyst Control Centre Desktop Properties. Select the displayport monitor and see if your monitor has a higher than 60 Hz refresh rate, if so set it to 60 Hz and see if you can now change it to 1680x1050.
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January 21, 2010 6:38:09 PM

I am not at my pc right now but what I can tell you, from playing with it earlier, is that it goes to 75Hz if I force it and that the monitors are set for 60Hz automatically. However the non-force/regular option for the Hz only has 60 as the option.
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a b U Graphics card
January 21, 2010 7:37:55 PM

I have 3 22" screens that go to 75hz, but only to 60hz at the max 1680x1050 resolution.

Do they all work (eyefinity) at 1400x900 btw?

Oh, I also have dual 5770's, but I'm running HDMI, DVI, DP. You are running all 3 screens off the same card yes?
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a b U Graphics card
January 21, 2010 7:45:08 PM

dieterbass2 said:
Is this due to having both GPUs connected?


By this, do you mean you are running a monitor each off both cards?

You need to run all 3 monitors off 1 card - your main card obviously. If your 5770 is one of the newer editions, it will only have 1 DVI output, meaning you need to get a HDMI > DVI cable. Luckily, those are a lot cheaper than the active displayport adaptor ($10 max).
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January 21, 2010 8:57:56 PM

jennyh said:
I have 3 22" screens that go to 75hz, but only to 60hz at the max 1680x1050 resolution.

Do they all work (eyefinity) at 1400x900 btw?

Oh, I also have dual 5770's, but I'm running HDMI, DVI, DP. You are running all 3 screens off the same card yes?



i am running all monitors off of 1 card. i just got the dp to dvi connector yesterday and havent tried the eyefinity yet in any resolution. i will try tonight when i get home.
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January 21, 2010 9:00:16 PM

my card has 2 dvi, 1 dp, and 1 hdmi. i had to buy the stupid dp adaptor. by 1 card i mean i have (2) cards on the MB but there are (2) crossfire connectors between the two graphics cards.
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a b U Graphics card
January 21, 2010 9:14:55 PM

Give whatever info you can please dieter.
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a c 172 U Graphics card
January 22, 2010 4:10:43 AM

I thought CF and Eyefinity only worked with the 5970, and even then only with a few games? I would go to only one card, at least until you get your monitor problem fixed.
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a b U Graphics card
January 22, 2010 7:40:34 AM

Nah 9.12 fixed eyefinity to work with crossfire.
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