G400 at 133 MHz bus speed?

[Faffy]

Hi!

I have used my PIII 450 MHz @ 600 MHz without any problems for 6 months. Rcently I have upgraded my memory to PC133 and changed the computer case from 235 W to 250 W. Since then my Matrox G400 does not seem to be able to handle the 133 MHz bus speed. Does anybody know, where I could start troubleshooting?

Csaba

[Pace]

What has changed in your system? You have upgraded the RAM to PC133 but were you already running 133Mhz FSB? Have you tried other vid cards or different PC's with the G400?

Simply changing the RAM to a better type should not stop the graphics card working. It could also be that the new case is hotter than the old one - try more cooling.

HTH, Paul

[everettes]

Bringing the clock speed down is a good start.

Are you serious?


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[Faffy]

Hi!
Thanx for the quick response. I usually run the machine without the cover, so cooling should not be the problem. The truth is that when I changed the memory, I was astonished that the PC133 memory can not do the same thing as the older PC100. I have some doubt that the shop did not sell PC133 but PC100. However, when I change the memory back to the old one that ran at 133 MHz for a long time, it does not work now. It can hardly manage 124 MHz. So I suspect that it is not only the video card problem but memory also.

Csaba

[Faffy]

Hi Everett!
I am not an overclocking freak. I am fine with 550 MHz. The only thing that bothers me that it ran at 133 MHz without any problems, and now I does not.

Csaba

[Ali]

I would have said that your mobo doesnt like your new RAM. Some mobos have trouble with some makes of RAM, but since you put your old stick back in, that doesnt seem to make sense.

Also, did you use the same DIMM slot for your ram?

With both sticks of ram doing the same thing, I think we can safely say its your power supply, or a seating fault.

If you still have your old case, pull the power supply out of that, and plug it into your computer. Just leave it dangling if it doesnt fit in the correct hole (be carefull not to short it on anything.

If that fixes your problem, then take your new case back and get a refund. Not all power supplies are made equal. A nice 250W can in some cases be better than a cheap 300W.

Hope you get back to 600 though.

Ali

[mlody]

Hi.

I have almost the same setup and don't hava any problems. I have asus p3b-f and p3 450 oc 600 with g400 single head 16mb.
I'm running system on 133fsb but my memory are pc100 (I had to change cas to 3) Also I'm using agp 2x setup and don't have ANY problems.
I don't remember what is my power supply, but I have Iwin q500 (full tower) case without ANY coolign fans, just cpu fan and power supply fan!!!!!

[paulcs]

I'm hoping your AGP divider is set to 2/3.

There are 250 Watt power supplies and their are 250 Watt power supplies. They vary in quality by a large degree. So much so, that a "weaker" power supply might actually be better than the "upgrade." The problem might not be your RAM at all. I, like Ali, have seen 250 Watt units that run better than 300 Watt units.

Given that your old RAM doesn't help matters, that leaves one variable.

Good luck.

Paul
paulcs@flashcom.net

[Faffy]

Power supply?

[Faffy]

Power supply?
It sounds real strange to me that a power supply can play such an important role in overclocking. I have just changed my mobo from Abit BE 6.0 ver 2.0 to MSI 6163 Pro. I played Wolrd Rally Championship 2000 for an hour at 124 MHz (@558 MHz) . It runs fine. I used MGATweak 1.12 to overclock the video card to Fo=285 MHz. This seems to be the highest it can go. It does not get hot. I have custom fan on the heat-sink from an older K6 CPU. It does a good job to keep the video chip cold. However it does not go higher then 143 MHz (Clock speed). I have to say that I am perfectly happy with that. I even got around 10% improvement by installing the 5.22 Matrox drivers. However, when I try at 600 MHz it just sucks. Even windows give me the blue screen, which never happened before. I might try to change the powersupply back to the old one.
Thanx for the help.

Csaba

[mkaresh]

My bet's also on the PS.

Another thing to check is whether your BIOS settings changed. This seems too obvious, but could you have changed something and then forgotten about it?

[Thundrchez]

What CAS latency is your RAM running at?

[DuRaNgO[MU]]

did you install the memory module in the same slot the old one was in?