As you know, there are BIOS'es in GPUs, which may be overwrited.
I wanted to make some mods to it using the nvflash.exe program. Those mods are: changing the frequencies of a GPU from the ever start of my PC, so I should not run the RivaTuner every time.
My specs are 200/166, and the system works stable at 220/205.
So, I saved an old BIOS, and changed the settings.
After rebooting I checked if the frequencies are set properly. The 220 GPU OC'ing was successful, but a 205 MHz for RAM was far lower than it should be.
In a help to the RivaTuner and some internet sites I've read that 64MB cards with some RAM chips configurations may show that they are working in a frequency twice as much as they are. It may be understood then that I set up my RAM frequency to 205, but it is a twice value, so it should be divided into 2.
So, I decided to put a 410MHz into the BIOS resulting in real 205MHz.
After flashing and clicking on the reboot button my PC got a black screen... :-(
I think, that those 410MHz my system took as it should be...
So, I went to my friend, who still has an old ISA graphics card in his "stock", and a mobo, which has that slot. We inserted two cards, connected them to two monitors, and SUCCESSFULLY flashed the old BIOS to my GPU !!!
But the card was, I think, already damaged...
The text modes work, 640x480x16 work, and that's all... No any VESA, no anything more than those specs. Installing Detonators Drivers result in a black csreen during OS load... Only Safe Mode and 640x480x16... :-(
But I'm lucky: I went to my PC manufacturer, and they exchanged my broken card with a new one. The only difference is that my old card had a black textolyt and my new card has a dark-blue now.
BTW, I noticed that a slider in the RivaTuner is working in such way: 170-171-...-298-299-150-151-...-251-252 (MHz)
So, here's the trick: until some value the frequency is doubled, and then it turns to a normal state !!!
But anyways, it is a good lesson for me: every man should think seven times, and then do something once.
Flashing videocards' BIOS is very risky, not only your case can happen, one can also damage the Boot Block on the EEPROM sometimes. Then the card considered DIA
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