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Why is my refresh rate so low?

Posted on 2011-02-12
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Last Modified: 2012-05-11
Hello everyone.
I have a very frustrating problem. I have my i7 920 computer set up with 8 monitors.
I have 3 gpu's and two usb-dvi gpus.
the primary display is an HDI Radeon 5770 series, on which i have my philips 37'' tv and my samsung 46'' tv. the problem i have been running into is that the refresh rate on the samsung is crap...it lags every time there is movement.
the other 2 gpu's are nvidia 9400's, with small 12'' or 14'' monitors.
i have a good computer, 6gb tri channel ram, the i7 920, and a good mobo.
i have tried to change the refresh rate, but the max reported is 60hz, whereas my tv supports up to 75 hz...
thoughts?
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Question by:chriselibama
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by:SemperWiFi
ID: 34879776
When using GPU's your CPU and RAM have little to do with what is shown on the screen. This in fact is the entire point of offing the workload to an add-in card.

LCD technology doesn't work the same as CRT and you're not only going to be relegated to the default for the screen but you will also be dealing with the relegation to the lowest denominator in the setup. So if you have a display which will only work at 60 then everything will be running at 60 (even if you have a 120 display).

So when you say the refresh is not good, are you saying it is only running at 60 or is the picture actually stuttering?
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by:chriselibama
ID: 34879932
that makes sense. :-/
the the picture is actually stuttering however
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by:SemperWiFi
ID: 34880663
Well it looks like you're trying to run two 1080 displays off of one card. I would expect it to stutter ;-)
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by:chriselibama
ID: 34880741
even though it is the 5770 with 1gb of dedicated ram?
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by:SemperWiFi
ID: 34896047
Yes
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by:SemperWiFi
ID: 34896052
If you're trying to throw Hi-Def 264 type streams to both at the same time I would...
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by:chriselibama
ID: 34897678
i took the hd connection off of the smaller tv and it still stutters with the one display...
thoughts?
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by:SemperWiFi
ID: 34899185
Technically, that card does have enough HP to drive both displays but this often occurs when a card is stressed. With the information you have provided, it sounds as though the card is bad. Do you have another you can test with?
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Author Comment

by:chriselibama
ID: 34899348
unfortunately, i only have the one, as it was rather expensive
>.<
i could try buying a new one though.
i know that you mentioned that I would be relegated to the 'lowest denominator in the setup'.
does this mean that since i have two less-than-stellar gpu's i am limited by that?
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by:SemperWiFi
ID: 34902490
Well it depends on what you're doing. If you are running out different feeds via different cards then each card will perform according to its own capabilities.

If your card is in warrantee you could send it in for RMA and let the manufacturer fix it. You may try testing the card first to see that it is indeed the card (which it sounds like it is). Make sure you have the latest drivers then use a video specific benchmark (like the 3DMark) with all of the settings turned up and see how it performs.
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Author Comment

by:chriselibama
ID: 34903593
*sighs* i am going to reinstall windows today... again. and if it still lags, i will try to isolate it by using ONLY the Radeon card. if it does it at that point, then i can say it was being 'held back' by the other GPU's. i will try what you mentioned with the benchmark testing and report back.
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by:SemperWiFi
SemperWiFi earned 500 total points
ID: 34905865
Not sure why you are reinstalling your OS, nothing you've mentioned indicates the need for that. I mentioned reinstalling drivers because it is simply a good practice to do so prior to testing. You just need to look for a hardware fault at this time, then move on. I wouldn't spend the time on a reinstall. Just pull the other cards out and test this one on its own.

Remove the drivers for the other cards when testing also, there could be a conflict with the drivers (another reason I never mix video adapters).

You may find that all is good and happy with only this card and it's drivers installed.
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Author Comment

by:chriselibama
ID: 34907890
hrm....i guess its entirely possible that the Nvidia / ATI compatability play could come into question.
I will try this and let you know what happens!
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Author Comment

by:chriselibama
ID: 34920337
alright. so heres what happened:
i disconnected the other monitors except for my primary graphics card (the radeon 5770). guess what.
no lag. (as you said lol).
i am reinstalling my computer because its just good practice for me...helps me get rid of anything...lol.
so is there anything i can do to make the ati / nvidia cards work with no problems?
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by:SemperWiFi
ID: 34935198
anything i can do to make the ati / nvidia cards work with no problems? nope
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chriselibama earned 0 total points
ID: 34936898
haha.
i figured it out. i made it work without lag.
After reinstalling windows, i used the default windows 7 nvidia drivers without installing the nvidia software...guess what?
no lag.
>.<
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by:SemperWiFi
ID: 34942728
Rock on!!! Glad to hear you got it sorted!
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Author Closing Comment

by:chriselibama
ID: 34977856
thanks for the help man.
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