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AMD 790GX HD 3300 won't display 1920 x 1200

J

jarsoffart

Golden Member
I just built a system based around the Biostar TA790GX A2+ and I'm having trouble with the IGP. I've tried using the drivers that came on the motherboard CD. I've tried the HD 3200 IGP drivers from the ATI website. I've tried the chipset drivrs from the Biostar page. All of them have the same problem. When I try to run my 24" LCD (Soyo Topaz S, which worked with my previous build) at native resolution (1920 x 1200), an image only appears every few tens of seconds or so (sometimes not at all). I've tried different refresh rates (60 Hz and 75 Hz) even though I'm pretty sure it's supposed to run at 60 Hz. If I use the ATI IGP driver, the image is also distorted, i.e. a few wide bars cover the display. At lower resolutions, the display is fine (besides the fact that it's non-native resolution). Do I have a faulty motherboard? or are the drivers poorly developed (seems unlikely since this board has been out for a few months)?

System details:
Biostar TA790GX A2+
AMD Althon X2 BE-2400
4 gigs of OCZ DDR2 800
Samsung DVD+/-RW
2x Samsung HD103UJ drives in RAID 1
Windows XP SP3

I'm using onboard graphics and onboard sound. The device manager shows no errors or warnings.
 
Get a video card. It seams the onboard video can't support the higher resolution. That or you need to go into the bios and alocate at least 512 of the RAm to the onboard video.
 
So, changing the UMA buffer from 64 mb to 256 mb helped a bit (the display switched from mostly blank to mostly image with intermittent flashes of a blank frame). I then upped it to 512 mb and it went back to its old state. I kind of find it hard to believe that the onboard video can't support the higher resolution. I used to run this monitor using an AGP4x GeForce 6200 with 128 mb of RAM.

Also, I used to have this problem with my old system where if I wrote data to my RAID array (using the KR7A on-board RAID) I'd hear a crackling through my speaker system. In my new system, I'm booting from the RAID array. Would this have any effect on the video? (I find this proposition doubtful since the OS is not run from the hard drive as far as I know, but maybe?)
 
sounds like it might be a bad motherboard tbh. do you have a PCI or PCI-E video card on hand to test with? since the IGP is integrated into the chipset it will really suck if you have to replace the mobo to get it working, but it should run just fine at that resolution /shrug.
 
Originally posted by: mpilchfamily
It seams the onboard video can't support the higher resolution.q]

That is definitely not the problem.

It sounds like a faulty GFX chip. Try asking the manufacturer if they have heard about problems like this before.
Click to expand...
 
I've tried installing the OS on a non-RAID drive. I just put in the replacement from New Egg and it has the same problem. I'm now in email correspondence with the Biostar technical support.
 
For anyone keeping track, the Biostar people are trying to reproduce the problem. Anyway, in the mean time I'm going to try an HDMI->DVI cable.
 
I'm now using the HDMI output on the motherboard and I can get a consistent display, except, now I pixels that "twinkle." They are off color (mostly pink) and seem to flicker or something. It doesn't seem like a windows driver problem since during the POST and the loading windows portion, I can see other effects. These effects are slightly different. During the POST, the white letters have some green outlining and during the loading windows portion I can see off-color lines. Any ideas?
 
I guess I might as well give an update. The previous "twinkling" problem was because I had the DVI cable plugged in simultaneously with the HDMI->DVI cable. The DVI cable was acting like picking up signals or something. Anyway, once I unplugged the DVI cable, it was fine. However, the image with the HDMI isn't perfect. Occasionally when doing "intensive" 2D stuff, like scrolling through a webpage with lots of flash/graphics fast, I'll see lines flicker. Sometimes the display will blank out. If I use an itunes visualization, the display will also blank out.

I decided to test at lower resolutions again, and the problem happens again. I tested the monitor again using the DVI output from a MacBook and it was fine.

I did some more research, and it appears I'm not the only one with problems. See here for 5 forum pages of posts. I didn't read all of them, but they complain mostly of slow scrolling, which I'm definitely experiencing. I didn't see specific mentions of the display blanking out. Here is a screenshot of my GPU-Z output. It's kind of troubling that the GPU clock is at 0 MHz, but that might be due to throttling. It shows a variable value from 60-700 MHz in the AMD Over Drive Utility. I'm more and more convinced this is a driver issue.
 
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