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Marvel G400 - Overclocking Issues
Okay. Here's the situation.
First thing I should mention is that I have not done any tweaking to the card itself. All references to overclocking refer to the motherboard frontside bus and PCI bus.
You can see the hardware I'm sporting in my sig. I've been running my rig at 140MHz FSB and 35MHz PCI, yielding a 911MHz processor speed. It's been rock stable for months, with one exception that I just attributed to this configuration.
During the cut scenes of almost every game I play, I get red and blue "dots" appearing randomly around the screen. They're 36 pixels in size, arranged in a group of 9 blocks of varying intensity. They only last for one frame, but appear with regularity.
To illustrate, they color blocks are arranged like this:
1 2 1
2 3 2
1 2 1
(3 - brightest color, 1 - darkest color)
(Note: I can post a screenshot if anyone is interested.)
I talked it over on the Matrox tech support board. After trying every viable driver, it occurred to me that it might have something to do with the system being overclocked. I knocked it back down to its original specs of 100/33. The symptoms disappeared. I clocked it up to 133/33. Symptoms are still gone.
This would lead me to believe that the problem stems from either the 140 FSB or (more likely) the 35 PCI setting. I'm going to do some more testing with various PCI bus speeds and report back on my findings.
Has anyone else experienced such strange video artifacts or have any idea why this is happening?
Any help would be greatly appreciated.
First thing I should mention is that I have not done any tweaking to the card itself. All references to overclocking refer to the motherboard frontside bus and PCI bus.
You can see the hardware I'm sporting in my sig. I've been running my rig at 140MHz FSB and 35MHz PCI, yielding a 911MHz processor speed. It's been rock stable for months, with one exception that I just attributed to this configuration.
During the cut scenes of almost every game I play, I get red and blue "dots" appearing randomly around the screen. They're 36 pixels in size, arranged in a group of 9 blocks of varying intensity. They only last for one frame, but appear with regularity.
To illustrate, they color blocks are arranged like this:
1 2 1
2 3 2
1 2 1
(3 - brightest color, 1 - darkest color)
(Note: I can post a screenshot if anyone is interested.)
I talked it over on the Matrox tech support board. After trying every viable driver, it occurred to me that it might have something to do with the system being overclocked. I knocked it back down to its original specs of 100/33. The symptoms disappeared. I clocked it up to 133/33. Symptoms are still gone.
This would lead me to believe that the problem stems from either the 140 FSB or (more likely) the 35 PCI setting. I'm going to do some more testing with various PCI bus speeds and report back on my findings.
Has anyone else experienced such strange video artifacts or have any idea why this is happening?
Any help would be greatly appreciated.
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