Overclocking the V1000

Here's the information on how to overclock you V1000
The person who found out to overclock the V1000 is Toni Lindroos. He wrote these instructions:


I successfully overclocked my V1000L-P! Here's how:


1) Use the latest miro v2.0 drivers.

2) Edit CARD0020.INI file (\windows\miro\timing\CARD0020.INI)

3) Find the resolution you want to modify (for example [1152*864*16@75Hz.VESA])

4) Add ´mclk=xxxxxx´ to this section. xxxxxx is the value which will determine the clock frequency

5) You should start from 100000 and then go higher with small steps (like 100000->105000 etc)
For example Windows 98 won't start with 140000 and is unstable at 135000.

6) When the system is unstable (distortion, computer crashing etc), you should lower the value

7) If the Windows 9x won't start at all etc, just enter the dos mode at boot (press F8 and then choose command prompt only) and edit
CARD0020.INI and lower the value.

Here's an example:


With this mclk setting my system (P188/64MB/V1000L-P) is stable.

Before: 1152x864x16 = 25 MP/s
After: 1152x864x16 = 38 MP/s

I take no responsebilities... Do everything at your own risk etc.


I think these miro v2.00 drivers work with all BIOSes. I discovered this quite accidentally. In the original CARD0020.INI there are no mclk settings but the update program which comes with the newest BIOS update adds mclk setting for some display modes. I just compared the new and the old file and... Then I just tried to modify those settings. With the value 140000 I got 40 MP/s but D3DTest crashed the computer.... I didn't try any RRedline games but I think this speeds up at least 2D and D3D.

BTW, I haven't tried to modify the pll setting yet. "

Making things easier:
Then there's Nick Moore who found out how to make things easier:

"Just as I was about to break down and buy a new video card, I learned about overclocking the V1000 using MIRO drivers. The drawback is that the MIRO drivers are a bit immature. You CAN use the Sierra drivers instead! Just install the MIRO drivers, edit the line at the top of card0020.ini in the windows\miro\timing\card0020.ini so that it reads:


I use 137500, but most people seem to have trouble setting it that high. Try 120000, and go from there. Reboot.

Keep trying different values for MCFG and reboot each time you change it. Now, once you've tested the card a fair bit, and you're comfortable that it can run for hours at a time playing VQuake or something similar, reload the Sierra drivers on top of the MIRO ones. Reboot.

Once everything is running again, reboot into safe mode, and enter the windows\system directory. Make a copy of wtscrm3d.dll for backup, and then rename wtmirovr.dll as wtscrm3d.dll This .dll file controls the timing for the card. Reboot, and you're done!

Please note that I attached a 486 heatsink and fan to the Rendition chip on my card. Those who've tried to do this without cooling have been much more limited in their success. As with any overclocking, there is a risk of damaging your card. I can only tell you that I'm not having any trouble with mine.

Make sure you have the latest Sierra BIOS, the latest Sierra drivers, and that you use the latest MIRO drivers, too. These are all available (I think) at www.bjorn3d.com I didn't come up with all this info, I'm just compiling it to make it easier for the computer pseudo-illiterates like myself. Obviously, I'm thrilled that someone figured all this out. Thanks to Martin and Toni who gave us this info.

Nick Moore"